5AFUSE – FUSE
SKU · 5AFUSE
$0.89
5 Amp bladed ATC fuse for HVAC control boards and low-voltage circuits. Standard automotive-style blade fuse. Common replacement on furnace and air handler boards.
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Showing all 31 results
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SUPCOSTC5300 – CERAMIC TEMPERATURE FUSE LINK (L300°, STRAIGHT)
SKU · NTCD300$17.65Ceramic temperature fuse link (straight), opens at 300°F (149°C). 15 Amp. Ceramic body for higher heat environments. Straight terminal orientation.
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Low Stock
UNIVERSALZRF05 – FUSE
SKU · ZRF05$14.99Replacement fuse for HVAC control circuits. Fuses protect the low-voltage transformer and control board by opening on an overcurrent, typically caused by a shorted thermostat wire or a failed control.
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SUPCOBRK3 – RESETABLE FUSE (3 AMP)
SKU · BRK3$21.66Supco BRK3 resettable 3 Amp diagnostic fuse for HVAC low-voltage circuits. Built-in light shows when circuit is active. Resets instead of blowing — saves time troubleshooting.
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SUPCOSTC4358 – TEMPERATURE FUSE LINK (L377°, 15A)
SKU · NTC378$5.37Temperature fuse link, opens at 377°F (192°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
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In StockEATON
FUS02295 – FUSE (TRANE)
SKU · FUS02295$15.10Trane FUS02295 time-delay fuse. 3.2A, 300V. Allows brief startup surges without blowing. OEM fuse for Trane furnace and air handler control boards.
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SUPCOSTC4228 – TEMPERATURE FUSE LINK (L235°, 15A)
SKU · NTC227$5.37Temperature fuse link, opens at 228°F (109°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
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Low Stock
SUPCOBRK5 – RESETABLE FUSE (5 AMP)
SKU · BRK5$21.66Supco BRK5 resettable 5 Amp diagnostic fuse for HVAC low-voltage circuits. Built-in light shows circuit activity. Trips and resets without blowing — great for troubleshooting.
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EATON3AFUSE – FUSE
SKU · 3AFUSE$0.893 Amp bladed ATC fuse for HVAC control boards and low-voltage circuits. Standard automotive-style blade fuse. Protects 24V thermostat circuits and control wiring.
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SUPCOSTC4333 – TEMPERATURE FUSE LINK (L333°)
SKU · NTC333$5.28Temperature fuse link, opens at 333°F (167°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
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In Stock
SUPCOSTC5333 – CERAMIC TEMPERATURE FUSE LINK (L333°, STRAIGHT)
SKU · NTCD333$17.65Ceramic temperature fuse link (straight), opens at 333°F (167°C). 15 Amp. Ceramic body for higher heat environments. Straight terminal orientation.
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UNIVERSALNTC282 – FUSE LINK
SKU · NTC283$5.37One-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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SUPCOSTC6257 – CERAMIC TEMPERATURE FUSE LINK (L257°, ELBOW)
SKU · NTCK257$18.69Ceramic temperature fuse link (elbow), opens at 257°F (125°C). 15 Amp. Ceramic body with 90° elbow terminal orientation for tight-fit installations.
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In StockSUPCO
STC4468 – TEMPERATURE FUSE LINK (L468°, 15A)
SKU · NTC468$5.37Temperature fuse link, opens at 468°F (242°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
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In StockUNIVERSAL
NTC388 – FUSE LINK
SKU · NTC388$5.05One-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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In Stock
SUPCOSTC6300 – CERAMIC TEMPERATURE FUSE LINK (L300°, ELBOW)
SKU · NTCK300$18.69Ceramic temperature fuse link (elbow), opens at 300°F (149°C). 15 Amp. Ceramic body with 90° elbow terminal orientation for tight-fit installations.
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In StockUNIVERSAL
S1-02526908000 – FUSE LINK
SKU · 02526908000$7.66York / Coleman / Evcon OEM thermal fuse link. Johnson Controls does not publish public specification sheets or cross-references for its York and Source 1 service parts, so no temperature rating, set point or amperage is listed here.
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SUPCOSTC4300 – TEMPERATURE FUSE LINK (L300°, 15A)
SKU · NTC300$5.37Temperature fuse link, opens at 300°F (149°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
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In Stock
SUPCOSTC5377 – CERAMIC TEMPERATURE FUSE LINK (L377°, STRAIGHT)
SKU · NTCD388$17.65Ceramic temperature fuse link (straight), opens at 377°F (192°C). 15 Amp. Ceramic body for higher heat environments. Straight terminal orientation.
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In StockUNIVERSAL
NTC203 – FUSE LINK (95C, 203F)
SKU · ntc203$5.88One-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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In Stock
UNIVERSALILFH – INLINE FUSE HOLDER
SKU · FUSE HOLDER$3.77Inline fuse holder for low-voltage HVAC control circuits. It splices into the 24 V control wiring and holds a replaceable cartridge fuse, so a short in the thermostat or control circuit blows the fuse instead of damaging the transformer or control board.
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In Stock
UNIVERSALNTCK218 – CERAMIC FUSE LINK
SKU · NTCK218$12.82Ceramic one-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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In Stock
SUPCOSTC5257 – CERAMIC TEMPERATURE FUSE LINK (L257°, STRAIGHT)
SKU · STC5257$17.65Ceramic temperature fuse link (straight), opens at 257°F (125°C). 15 Amp. Ceramic body for higher heat environments. Straight terminal orientation.
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In StockUNIVERSAL
NTC178 – FUSE LINK
SKU · ELE-NTC178$5.05One-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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FIRST CO9-115-34-1 – FUSE LINK ASSEMBLY (FIRST CO, N951-1)
SKU · FIRST COMPANY$11.84First Company 9-115-34-1 thermal fuse link assembly. 25 Amp, opens at 300°F. Ceramic body with stake-on terminals. Safety device for First Company HX coil units.
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SUPCOSTC4438 – TEMPERATURE FUSE LINK (L438°, 15A)
SKU · NTC438$5.37Temperature fuse link, opens at 438°F (228°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
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In StockUNIVERSAL
NTCK204 – CERAMIC FUSE LINK
SKU · NTCK204$12.82Ceramic one-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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In StockUNIVERSAL
NTCK194 – CERAMIC FUSE LINK
SKU · NTCK194$12.82Ceramic one-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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In StockSUPCO
STC6333 – CERAMIC TEMPERATURE FUSE LINK (L333°, ELBOW)
SKU · NTCK333$18.58Ceramic temperature fuse link (elbow), opens at 333°F (167°C). 15 Amp. Ceramic body with 90° elbow terminal orientation for tight-fit installations.
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In StockUNIVERSAL
NTC170 – FUSE LINK
SKU · ELE-NTC168$5.05One-shot thermal fuse link – backup overheat protection in electric furnaces and air handlers.
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In Stock
SUPCOSTC4257 – TEMPERATURE FUSE LINK (L257°)
SKU · NTC257$5.05Temperature fuse link, opens at 257°F (125°C). 15 Amp rated. One-time-use thermal safety device — if it’s blown, the system overheated and needs the fuse link replaced.
Signs You May Need a New HVAC Fuse
HVAC systems use fuses to protect the low-voltage control circuit (typically 3A or 5A on the furnace board) and high-voltage disconnect fuses for the outdoor unit.
System Completely Dead — No Response▼
- Nothing happens when the thermostat calls for heating or cooling.
- The control board has no LED lights or diagnostic codes.
- A blown 3A/5A board fuse kills the entire 24V control circuit.
If a board fuse blows repeatedly, there's a short somewhere — usually in the thermostat wiring or a sticking contactor coil. Don't just keep replacing fuses.
Outdoor AC Unit Won't Run▼
- The indoor blower works but the outdoor condenser unit doesn't start.
- Check the disconnect box mounted on the wall next to the outdoor unit.
- Pull-out fuses in the disconnect can blow during power surges or storms.
System Works Intermittently▼
- The system runs sometimes but randomly stops.
- A fuse that's partially blown or has a loose connection can cause intermittent failures.
- Corroded fuse holders in outdoor disconnects are common in humid climates.
Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement.
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📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm