3AFUSE – FUSE
SKU · 3AFUSE
$0.89
3 Amp bladed ATC fuse for HVAC control boards and low-voltage circuits. Standard automotive-style blade fuse. Protects 24V thermostat circuits and control wiring.
Product images are representative. Always verify compatibility with your model number before visiting us in store.
Need help finding the right part?
We test parts at the counter and match the right replacement. Walk in or call ahead.
All parts 1,291Equipment & Systems 67Filters & Air Quality 83Air Distribution 259Furnace & Heating 39Refrigeration 67Thermostats & Zone Controls 17Switches & Sensors 132Electrical Components 224Motors & Blower Parts 129Tools & Supplies 276
Showing all 20 results
-
In Stock
FUSE -
In Stock
FUSESTC4228 – 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.
-
In Stock
FUSESTC4358 – 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.
-
In Stock
FUSESTC4333 – 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.
-
In Stock
FUSESTC4438 – 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.
-
In Stock
FUSESTC6333 – 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.
-
In Stock
FUSESTC4468 – 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.
-
In Stock
FUSESTC5377 – 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.
-
In Stock
FUSESTC6257 – 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.
-
In Stock
FUSEFUS02295 – 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.
-
In Stock
FUSE9-115-34-1 – 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.
-
In Stock
FUSESTC4257 – 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.
-
In Stock
FUSESTC5257 – 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.
-
In Stock
FUSESTC4300 – 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.
-
In Stock
FUSESTC5300 – 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.
-
In Stock
FUSEBRK3 – 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.
-
In Stock
FUSESTC6300 – 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.
-
In Stock
FUSESTC5333 – 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.
-
In Stock
FUSE5AFUSE – FUSE
SKU · 5AFUSE$0.895 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.
-
Low Stock
FUSEBRK5 – 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.
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.
📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm