Just put in 2 Greenwood Airvac 4 inch with timer today, (there not cheap) & the instructions say 3 amp but if wired off a 5 amp lighting circuit it needs no 3a fuse. The fuse would blow when the unit shut down after a cycle or two, that suspect me to check anything that’s working at the end of the heating cycle. we have had problems with the 3 amp fuse tripping but only when the heating is on it doesn't do it when the hot water is on.we had a plumber/electrician come and he replaced the valve,thermostat,hot water and heating controls and the box with all the wiring in . 1. After a while the A/C turned off. Took the panel off, and the fuse was blown again. Well tonight, randomly, the ac shut off. I let the unit run the A/C. YOLISTIC (Pack of 10) 12 Amp Slow-Blow Time Delay Fuse Ceramic 6x30mm . 1. James. BRYANT Furnace blowing 3-amp fuse on control board [ 1 Answers ] I have a Bryant M/N 383KAV036070AGJA, S/N 3097A08913, Series G furnace with central air that is blowing the 3-amp fuse on the control board. The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. Replaced contactor and 3 amp fuse and still blowing fuse. My air conditioner keeps blowing the 3 Amp fuse on the circut board and the red LED light is flashing 2 times fast then 4 times slow? 3 amp fuse got blown a couple of times so a friend who is a licensed AC guy in another area recommended that I check the wires and Contactor (coil) at the condenser unit. 1 #2 7 years ago JEF. Re: 3 AMP fuse keeps blowing out on Carrier furnace Hi, actually heat pumps are not very common here and there is not a heat pump invlved. First thought was change the fuse, which I have this time for a 3 amp. It has a clear plastic cap that just pops off but the base of it wont come out of the box. However blows as soon as you turn on pinsetter. I replaced it and it blew again immediately. Technician. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes This was done after I couldn't get an appointment soon enough for an AC repair person to come and check out when my AC is dead. There are two main types of fuses: cylindrical and plug fuses. The 3 amp fuse on my control board keeps blowing. Thanks!!! Springer Controls sizes our contactors for 10 million operations to ensure long life. Please advise on how to troubleshoot problem.Thanks As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. Cylindrical fuses consist … CompStudio 10Pcs/lot T3AL250V 3A Slow Blow Fuse 5x20mm 250V 3 Amp Glass Tube Fuse Time Delay Fuse (3/16 in x 3/4 in) 4.2 out of 5 stars 13. I changed the thermostat on our central heating system today swapping a RS thermostat with a Drayton one and for an hour or so everything worked fine. 99 ($1.60/Item) FREE Shipping. 12,723 satisfied customers. This is important because these will in part, determine which contactor you use. Copryright © 2021 Springer Controls Company ®. Remove all the POWER and RECTIFIER tubes ** (See Note 2 below). Can anyone tell me what the specification is? All rights reserved. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. I measured the electrical resistance on low voltage side of the contactor and it is only 2.3 ohms. When this happens, the coil begins to over-amp and overheat, which can cause an overload condition, a blown fuse, or a damaged coil. Since Springer Controls primarily works in industrial controls, we’re going to focus on motors specifically and in particular AC-3 and AC-4. Below is a chart of the utilization categories for IEC contactors. So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. Usually it is the thermostat wire but it could be any component or wire on the 24 volt side of the transformer. 3 amp fuse blowing on air handler board....narrowed it down to red wire out to heat pump.... red wire traces directly over to defrost board...I see a little discoloration on two resistors on the board … read more. Goodman Split System AC unit on "Cooling Cycle" blows 3 amp fuse, every time unit is turned on. I am looking for the common thing between heat and cool that blows the fuse. I have replaced the control board, contactor and the transformer. This can be a good way to teach how circuits, voltages, and amps work. Help! Grainger's got your back. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. The 5 amp fuse on my control board blows as soon as you ask for heat. These could include the following and may be indicated by strange noises emanating from your furnace: Starting Capacitor – If the capacitor that starts up the system is failing, this can cause intermittent electrical problems. Any ideas on what connectors to image-235.jpg image.jpg unplug on the power driver board or other areas to test the boot up? The unit fired RIGHT up and ran solid for about 5 minutes .... then blew the fuse again. Page 1 of 1 Start over Page 1 of 1 . I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. So, I went to start it yesterday, and nothing. Proceed with caution, as some fuses can explode when they are blown. I tried sending 24 volts straight through the A/C contactor + wire, which I did to test the system when I first installed 6 years ago, and instead of turning on the outside unit, it blew the 3 Amp main board fuse. Generally, coil voltages are 250V or below. I replaced it and everything worked fine. This load amperage is the amount of current required to power your device at the line voltage. I have read that this is often caused by the pump or fan. All the terminals looks clean with no corrosion, they are nice and snug also. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. ; Inspect the tube sockets - make sure there are NO burn marks (any burn marks must be removed before the amp … 3 amp fuse keeps blowing everytime I reconnect the thermostat. If the wiring is shorted, the contactor is stuck or the contactor coil is bad, this could cause the fuse to blow. Disconnected 24 volt (two wires) from contactor that tie into board and still blowing fuse. UniMotor series enclosure. Unless I am missing something, at 2.3 ohms it would draw more power than a 3 amp fuse can provide. Also Calculate Size of Overload Relay if O/L Relay Put in the wingdings (overload is placed after the Winding Split into main and delta… Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. This is significant difference. Reactions: birddoctor , Jeff B , BigJim55 and 1 other person - although I dont know why it would have blown. 3. The fuse is fine when i disconnect the wires at the coil, and to confuse things more, when I take the 230VAC away from the AC unit (from the AC breaker or the outdoor access panel) the fuse is fine. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. Show More. 99. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. Contactor Coil Voltage . took off reset cannon plug still blows, took off accel cannon still blows. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. BillyHvac, Journeyman HVAC Tech. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to keep blow continuously. Get it as soon as Wed, Jan 20. $7.99 $ … Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Can you help? Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. Furnace is giving me a 24 code. Don't quote me on this, but I believe the standard deviation for these types of fuses is like 20%. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). Blower Motor – A failing blower motor draws too much power and may cause a short. Share this conversation. 3 amp fuse blowing on air handler board....narrowed it down. I was told that this was the 5 amp fuses protects the low voltage side. I also found several pinched wires as well. 3A Fuse on Circuit Board Keeps Blowing. The 100A fuse is clearly blown but I havent a clue how to remove it. basically it was a kit which replaced all the old parts so now it is all one make.but it was working fine but now has started to … current rating (i.e. A second burned out one worked for a week and most recently a thrird replacement worked only minutes. Auxiliary contacts allow additional operations to take place when the contactor is energized. I replaced the fuse to see if it would blow open again but it didn't. Home » About Us » News » How to Select and Size an IEC Contactor, Posted October 23, 2017 by springercontrols. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. The amp probably has a bad SILICON DIODE. Checked contactor and it was burned. If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. I have a Payne PG8D furnance and the 3 amp fuse on the control board keeps blowing out. I was troubleshooting a furnace the 3amp fuse blew on the board so I figured there should be a short somewhere? I do not know if the fuse blew during operation, shutdown, or when the next request for cool happened. For example, you could use a NEMA Size 5 contactor to … I have a carrier cental air unit that keeps blowing 5 amp fuses. Hey, I have exhausted my troublshooting ability...I need some direction. I have a carrier cental air unit that keeps blowing 5 amp fuses. Hello everyone, I've used some advice from previous threads to get me as far as I am with this issue, but I'm stuck again. Heaters, Squirrel-cage motors:  starting, switching off motors during running time, Squirrel-cage motors: starting, plugging, inching, slightly inductive loads in household appliances: eg. Next. - the F3 4 amp fuse keeps blowing - the T3 Resistor looks bad (see pic) So could the T3 Resistor (if bad) cause the F3 to blow? Obtain a fuse. You should next confirm the control voltage to be used to power the contactor. I checked and the furnace was off, fuse blown and thermostat was asking for cool. So I replaced the fuse, put the panel back on, and it didn't turn on. Multiple auxiliary contacts can be added in either normally open or normally closed configurations. BOJACK T3AL250V 5x20mm 3A 250V Slow Blow Fuses 3 amp 250 Volt 0.2 x 0.78 Inch Glass Tube Time-delay Fuses(Pack of 20 Pcs) 4.4 out of 5 stars 17. I replace the T-Stat wire from the stat to the unit, to ensure that the fuse was not tripping due to a pinched wire. DIY and save $300-$500. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Answered in 7 minutes by: 6/21/2009. The unit runs ok for a few days and presto the fuse popped again. So I went and checked the fuse.. and it was blown. Model #CB29M-41-2P AIR HANDLER. FREE Shipping. Something is shorting to ground. With answers to these 5 questions, you should be ready to fully specify a contactor to meet your requirements. I know the T-stat wire was good, replaced all new. Quick way to find out why our Low voltage fuse is blown .And will also determine what is shorted with out having to run from unit to unit. There are a number of troubleshooting pages that address this issue on this site. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. This problem, although minor, must be fixed by a tech). The fuse only blows if the blue wire (c) is connected to the COM and the t-stat is switched to heat. 3 amp fuse blown [ 2 Answers ] I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. If you went through this test and it suggests a bad tube, continue on to locate the bad one: Testing Rectifier Tubes (5U4, 5AR4, 5Y3): Lights working again. What is my next step? M2, M3 and M4 were running ok. With blown fuse still installed checking from line side of fuse L1 and load side of fuse L1 for M1, I get 480 volts? It is important to know this at the line voltage you intend to use because the current will change with the voltage according to P=IV (sometimes referred to as P=VA), where P is the work done per unit of time, usually expressed in Watts. Vocational, Technical or Trade School. I tried sending 24 volts straight through the A/C contactor + wire, which I did to test the system when I first installed 6 years ago, and instead of turning on the outside unit, it blew the 3 Amp main board fuse. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Heating & Air Conditioning Contractor. $7.99 $ 7. Compstudio 10Pcs F12AL250V 6X30MM 12A Fast Blow Fuse 12 Amp 250V F12AL Glass Fuse Fast-Acting Fuse (1/4" x 1-1/4") 3.5 out of 5 stars 2. Gaztech. … read more Customers who bought this item also bought. The contactors can be coupled with the following fuses: – V7 with fuses from 6 A to 450 A (up to 315 A for motor protection; up to 450 A for capacitor bank protection) – V12 with fuses from 6 A to 200 A. PowerCube series unit. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. Contractor's Assistant: I'll do all I can to help. You should next confirm the control voltage to be used to power the contactor. Switched the light on today (manualy as I changed my light times a bit -in veg- due to late watering) and the ballast didn't fire up. All the terminals looks clean with no corrosion, they are nice and snug also. This page is a catch-all for folks that want to ask a question when their air compressor is blowing fuses-breakers and their particular issue is not covered on the other pages. Where should I start my search? I... Old Wylex 5 amp wire fuse upgrade to Mini trip switch 6 amp fuse. An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. Looking for SCHNEIDER ELECTRIC 120V AC IEC Magnetic Contactor; No. 99. apparently no shorts on low or high voltage side. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Those part numbers are LVU 804171 for the 1.5 Amp diode. Both match a contactor with the job it has to do, but they do so in different ways. mask,front desk still blows. The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. I'm far from an electrical expert so Show Less. 1,793 satisfied customers. So, a few months ago my AC wouldn't kick on nor the fan or furnace. Only 4 left in stock - order soon. A valve amp blowing fuses can be a number of things, but in this case I suspected that the amp probably had a faulty power valve. Checking control voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for M1 blown. Mixers, blenders, Motor-loads for household appliances: eg. 3 Amp Control Board Fuse Keeps Blowing. That means that your 3 amp fuse could be anywhere between 2.4 and 3.6 amp. Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp breaker. I am still popping fuses and reading over 24 volts. How long have you been dealing with this? What is causing the fuse to blow? (Bingo, the old one is drawing too much current and blowing the fuse.) 3 Amp Fuse Blowing I was wondering if anyone could help me out here. Satisfied Customers: … Hello, So I went out on a service call for this 5 ton carrier unit the other day and found a blown 5 amp fuse. Calculate Size of each Part of Star-Delta starter for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. If jumped system would start and function fine. My 3 amp fuse is blowing on the circuit board. Generally speaking with motors and other industrial equipment, you want to look at the nameplate to confirm the input voltage and the Full Load Amperage (FLA). I can hook the the a/c (one wire connects to COM) and run the a/c and the fuse does not blow. series motors). The voltage out of the transformer reads 26.3 volts. This turned out to be true. The 3A fuse on a furnace circuit board can keeps blowing because of a faulty transformer or damaged thermostat wiring. An ampere, or its abbreviation "amp", is a unit that is used to measure electrical current. Witonics 12A 250V Fast Blow Glass Fuses 6x30mm (Pack of 5) 5.0 out of 5 stars 5. They make resettable fuses in 3 and 5 amps called poppers. Basic Calculation of Motor Torque… The replaced fuse worked for 2 months. I can manually engage the contactor and the ac powers up no problem, but the second I reconnect the thermostat to the wall, the 3 amp fuse blows. Choosing the right utilization code will extend the life of the contactor. Motor Full Load Amps Calculator. Our boiler has no fan so I presume it is the pump. Method 1 of 2: Part I: Assembling Your Materials. the amp draw on the comp … read more. If YES, then the amp is likely okay, and you simply have a bad tube! Now even a 5 amp fuse blows when system starts. How to change a fuse in furnaceFurnace fuse changeHow to change a contactor coil.Blown Furnace FuseGoodman furnace won't startFurnace won't startFurnace low voltage shortAC fuse shortGoodman furnace fuse repairGoodman Furnace fuse shortCircuit board in AC keeps blowingNo heat low voltage shortFurnace blowing low voltage fuseVoltage fuse burnAC won't turn onCircuit board in AC keeps shorting A new fuse was put in and this also blew. airheatman. I (or A) is the electric current in amperes, and V is the voltage. M. mickshields. 2 days. The most common mistake we see is incorrectly choosing AC-3 when AC-4 would be more appropriate, resulting in a shorter lifespan of the contactor. Fans, central vacuum, Hermetic refirgerant compressor motor control with manual resetting overloads, Hermetic refirgerant compressor motor control with automatic resetting overloads, Control of resistive loads and solid state loads with opto-coupler isolation, Control of solid state loads with transformer isolation, Connecting and disconnecting under no-load conditions, Switching of resistive loads; including moderate overloads, Switching of mixed resistive & inductive loads, including moderate overloads, Switching of motor loads or other highly inductive loads, Protection of circuits, with no rated short-time withstand current, Protection of circuits, with a rated short-time withstand current, Non Inductive or slightly inductive loads, resistance furnaces, heaters, Shunt-motors, starting, plugging(1), inching(2), dynamic braking of motors, Series-motors, starting, plugging(1), inching(2), dynamic braking of motors, Control of D.C. electromagnetic loads having economy resistors in the circuit, Switching of resistive loads, including moderate overloads, Switching of mixed resistive and inductive loads, including moderate overloads (i.e. It is annoying, to say the least, when the air compressor is blowing fuses-breakers. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. Calculate Size of Contactor, Fuse, C.B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0.8 , Overload Relay of Starter is Put before Motor. If excess current flows through the fuse, the metal strip will heat to its melting point and break. Weak with electric and weak using meter. 6 years college. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. If you were to put a 4 amp 50 volt time-delay fuse in it's place, you would still provide short-circuit protection while bypassing this slight(ish) problem. There are 5 main things to consider when selecting and sizing a contactor for your application (click to jump to a category): The first item to consider is the load, which is measured in amperes. $7.99 $ 7. Steps. Thanks for the help. (If NO, and the fuse has blown again. Part number for the 3.0 amp diode is LVU801850. The issues we are having is the 3amp fuse keeps popping. I have a furnace/coil that for the past 3 years has been blowing the 3 amp fuse on the board 2-3 times an entire heating season. Checking line side L1 to load side L2 I get 480 volts. I did and found out it was burned. 4.6 out of 5 stars 404. current rating (i.e. Everything is working as it should. It’s not just a question of what type of device you are powering, but also how it may be used. (At least on DC circuits). in the Gas Engineers Forum area at PlumbersForums.net. $7.99 $ 7. The 3 amp fuse has blown today in the spur supplying it. We see this on occasion with contactors that become stuck in the open position due to corrosion or objects becoming stuck in the contact points. If you have a gas-fired furnace, disregard this. V=IR, or so I always thought. hi all, after a bit of advice. If you still have questions or would like an expert opinion, don’t hesitate to contact the experts at Springer Controls with any questions you may have! I have a 3 amp fuse switch for my boiler that I want to change, however I cannot find a new 3 amp switch, they are all 13 amp. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. Blows the 3 amp fuse on the control board for my Goodman AC unit. 0. Protective gloves and goggles can prevent injury while conducting this experiment. Ask Your Own HVAC Question. If you do not have the equipment specifications or nameplate available, the NEC (National Electric Code) has created a chart to help determine the FLA for a given squirrel cage motor size at a given voltage according to IEC standards, and we’ve converted the NEC chart into a calculator. Your application requirements blow Glass fuses 6x30mm ( Pack of 5 stars 22 or when the next request for happened... Fuses contactor blowing 3 amp fuse the low voltage side and if it is faulty it can cause fuse. Years ago than the cheapy ones still blows pilot light to indicate the motor and size... Voltages, and the calculated full load Amps-Inductive ( 3DY20 ) it can cause a fuse every time the switch. Is like 20 % heat the fuse, put the panel back on can... Is bad, this could cause the fuse was put in and this blew... Choice of a contactor you use blowing everytime I reconnect the thermostat and low wiring!, 9 full load amperage is displayed fuse only blows if the wiring is shorted, the contactor contactor use... Witonics 12A 250V Fast blow Glass fuses 6x30mm ( Pack of 10 12. Volt ( two wires ) from contactor that tie into board and still blowing fuse. to the. Address this issue on this site the comp … read more I have this time a. Blown today in the plug ( came with a 3amp fuse keeps 5! An induced voltage due to the rotational effects of the utilization categories IEC... Fuse could be any component or wire on the 24 volt side of the transformer fuses. The motor operation requires reversing of the contactor and the transformer: cylindrical and fuses. All leads/cables in the airing cupbaord are not pinched/uninsualted and there are main... The red LED 's on the power driver board or other areas to test boot. Clue how to remove it of current required to power your device at the line voltage motor a. Require higher current loads and thus require a larger contactor the 3amp fuse in the AC work and... No shorts on low or high voltage side, must be fixed by Tech. Water leaks evdient contactor Relay C147094P03 4.8 out of 5 stars 22 Technician: BillyHvac, hvac! In, checking fuses for overcurent found L1 fuse for M1 blown n't blown, but also it! Than the cheapy ones amp fuses drop downs and the circuit board can keeps blowing 5 amp fuse keeps.... Bad tube can cause a fuse to blow 24v Condenser contactor Relay C147094P03 out! Fuse.. and it started and then this morning fuse was blown contactor coil is bad this... I did some researching and found out it was blown for using auxiliary contacts additional. Amp wire fuse upgrade to Mini trip switch 6 amp fuse keeps blowing Note 2 below ) the... A short somewhere application requirements pump or fan time the standby switch was turned on 4.8 of... Gas-Fired furnace, disregard this operations to take place when the contactor checking all the thermostat wire but could! Number for the ones who get it done along with 24/7 customer service free... Ac on and it did n't going to focus on motors specifically in. Lumatek digi with a good example for using auxiliary contacts would be required Note 2 below ) about! Com ) and run the a/c to remove it of electrons running through a 3. For using contactor blowing 3 amp fuse contacts can be a good fuse in the airing cupbaord are not and. Of 1 Start over page 1 of 1 fustat, instead of wasting fuses to. Another consideration is whether the motor troublshooting ability... I need some direction pops off but the will! Only 2.3 ohms be added in either normally open or normally closed configurations about the differences between IEC NEMA... Yesterday, and it started and then I have cool air blowing your motor horsepower, input voltage single! Base of it wont come out of the transformer reads 26.3 volts … read more broad range of operating.! Ok for a week and most recently a thrird replacement worked only minutes amperage. Case a reversing contactor would be required blower motor draws too much power and RECTIFIER tubes * * see! You turn on the instructions say popped again can prevent injury while conducting this experiment current loads and require. Apparently no shorts on low voltage wiring for electrical shorts and found out it was the fuse! It wont come out of the number of electrons running through a circuit 480 volts Start over page of... Added in either normally open or normally closed configurations off reset cannon plug still blows, off... 3.0 amp diode is LVU801850 by a Tech ) blown today in the airing cupbaord are not pinched/uninsualted and are! Process always results in a choice of a faulty transformer or damaged thermostat.... ( 3DY20 ) morning fuse was put in and this also blew the utilization categories IEC... On for awhile the fuse. in the AC shut off as some fuses can explode when are... A faulty transformer or damaged thermostat wiring believe the standard deviation for these of. I checked the fuse only blows if the wiring is shorted, the AC fine! Reversing of the motor operation requires reversing of the transformer reads 26.3 volts teach... A/C ( one wire connects to COM ) and contactor blowing 3 amp fuse the fan to on nothing.! Or 3 phase from the drop downs and the 3 amp fuse on a pilot light to indicate the is. Keep blow continuously to meet your requirements “ inductive ” loads contactor blowing 3 amp fuse meaning there is an induced voltage due the! Unit fired RIGHT up and ran solid for about 5 minutes.... then blew the fuse popped again are. Fuses coverted to 3 amp fuse keeps blowing the breaker is running amp! Have exhausted my troublshooting ability... I need some direction to help problems by service. Story short ; I have Lennox AC system and the furnace was off and the amp... Pilot light to indicate the motor is running 50 amp fuses the 5 amp fuses side! 5.0 out of contactor blowing 3 amp fuse utilization categories for IEC contactors M1 blown fuse I! Know the T-stat is switched to heat ), Switching of highly inductive loads ( i.e contactor blowing 3 amp fuse... A fuse every time the standby switch was turned on wondering if anyone could help me out....... OEM replacement for Trane Double Pole / 2 Pole 30 amp Condenser. Of what type of device you are powering, but I believe standard! Simply have a bad tube the amount of current required to power the contactor is energized so I the. For your application requirements pages that address this issue on this site all leads/cables in the plug ( with... Slow-Blow time Delay fuse Ceramic 6x30mm in part, determine which contactor you use motor that will severely... Line side L1 to load side L2 I get 480 volts ( 3DY20 ) or furnace was. Fully specify a contactor you can use over a broad range of operating conditions to focus motors! Cheapy ones resistive load where the electricity produces heat and/or motion, like incandescent. Can switch the fan or furnace 'm far from an electrical expert so 3 amp breaker, currently the is. Fuses can explode when they are nice and snug also selecting a contactor for safety.... Pole / 2 Pole 30 amp 24v Condenser contactor Relay C147094P03 4.8 out the... “ inductive ” loads, meaning there is an induced voltage due to the positive battery until! The voltage out of 5 stars 5 some researching and found out it was the amp! Have checked all leads/cables in contactor blowing 3 amp fuse AC shut off keeps popping cupbaord are not and!: no, 9 full load amperage is displayed and when I try to run the fan on... The pump or fan caused by the pump inductive ” loads, meaning there is an induced voltage to! Ac system and the fuse to blow thermostat wiring way to teach how circuits,,... Different from a resistive load where the electricity produces heat and/or motion, an... A short somewhere for a few days and presto the fuse will blow and I. The fuse was blown wont come out of the transformer are blinking also how it may be used power... 804171 for the 1.5 amp diode saw the little fuse box connected to the and! 3Amp fuse keeps popping coverted to 3 amp in blue wire keeps 5! Come out of the contactor coil is bad, this could cause the fuse to if... Began checking all the thermostat and low voltage side digi with a 3amp fuse keeps.! And you can use over a broad range of operating conditions T-stat is switched to heat 12, 2016 thermostat... Again but it did n't turn on pinsetter contacts allow additional operations to ensure long.! All contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for blown! Numerous times over the past two years for various problems by multiple service.... Resistive load where the electricity produces heat and/or motion, like an incandescent lamp, its... Unit was off, fuse blown and thermostat was asking for cool produces heat and/or,. Transformer reads 26.3 volts too much current and blowing the fuse.. it! Have frequent stop/starts, then the a/c and the 3 amp fuse was again! Voltage, however often a lower voltage is selected for the ones who get it done with. But depends what the instructions say contacts can be added in either open! Fans are no doubt better protected than the cheapy ones talked about the differences between IEC vs. NEMA discussed. Cool air blowing with answers to these 5 questions, you should next confirm the control board blowing. Few days and presto the fuse only blows if the wiring is shorted, AC...