IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). Customers who bought this item also bought. Use it for guidance, but please always refer to the equipment nameplate for the specific information whenever possible as the FLA can vary greatly due to a variety of factors. Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. When I replace the fuse, and turn on the thermstato to cool, and set the fan to auto, and the fan blower comes on the fuse blows. The valve amp was blowing a fuse every time the standby switch was turned on. This can be a good way to teach how circuits, voltages, and amps work. The 3 amp fuse on my control board keeps blowing. 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. The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse after the compressor runs for half a day or so. #fuse #contactorsize How calculate fuse size and Contactor size for motor? To make a long story short; I have replaced contactor, and the circuit board. ... After turning the power back on I can see the red LED's on the board are blinking. This turned out to be true. 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. This is significant difference. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. 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. Anyway, in March, the 3 amp fuse on the internal board in the furnace blew....the system was installed 2 years ago, and I didn't hink much of it. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp breaker. 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. current rating (i.e. $7.99 $ 7. Model #CB29M-41-2P AIR HANDLER. (Bingo, the old one is drawing too much current and blowing the fuse.) That means that your 3 amp fuse could be anywhere between 2.4 and 3.6 amp. Replaced contactor and 3 amp fuse and still blowing fuse. I checked and the furnace was off, fuse blown and thermostat was asking for cool. I have replaced the fuse and after the heat is on for awhile the fuse will blow and then I have cool air blowing. 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. $7.99 $ 7. 1 #2 7 years ago JEF. A new fuse was put in and this also blew. I replaced the fuse to see if it would blow open again but it didn't. (If NO, and the fuse has blown again. Cylindrical fuses consist … series motors). 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): You should next confirm the control voltage to be used to power the contactor. I never saw the little fuse box connected to the positive battery cable until now. 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? - although I dont know why it would have blown. All the terminals looks clean with no corrosion, they are nice and snug also. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes Part number for the 3.0 amp diode is LVU801850. current rating (i.e. Category: HVAC. Next. 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. I went a head and replaced it. A good idea but depends what the instructions say. This load amperage is the amount of current required to power your device at the line voltage. 1,793 satisfied customers. So, a few months ago my AC wouldn't kick on nor the fan or furnace. I replaced it and everything worked fine. 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. the amp draw on the comp … read more. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. For example, you could use a NEMA Size 5 contactor to … Non-inductive or slightly inductive loads, eg. Multiple auxiliary contacts can be added in either normally open or normally closed configurations. UniMotor series enclosure. A second burned out one worked for a week and most recently a thrird replacement worked only minutes. So, I went to start it yesterday, and nothing. $19.25. Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. I have a carrier cental air unit that keeps blowing 5 amp fuses. and line current calculation, phase current, Starting current calculation . Answered in 7 minutes by: 6/21/2009. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Lifespan will be turned on/off constantly will require higher current loads and thus require a larger.... 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