Supco Microwave Slow-Blow Ceramic Fuse, 20A 250V - CF20SB

Supco Microwave Slow-Blow Ceramic Fuse, 20A 250V - CF20SB

Restore microwave circuit protection with this aftermarket replacement Supco Microwave Slow-Blow Ceramic Fuse, 20A 250V - CF20SB. This 20 amp, 250 volt slow-blow ceramic fuse is designed for appliance circuits that require time-delay protection instead of an instant-opening fast-blow fuse.

Compatibility: Used in select microwave and domestic appliance fuse applications where a 20A 250V slow-blow ceramic fuse is specified.

This part commonly replaces previous part numbers including W10138793 and 4393146.

Fitment / What To Verify: Verify that the original fuse calls for a slow-blow/time-delay 20A 250V ceramic fuse. Fast-blow and slow-blow fuses are not interchangeable unless the appliance service information allows it.

Please confirm fitment with your appliance model number before ordering.

Is it time to replace?

• Common Symptoms: Microwave or appliance has no power, fuse tests open, or power is interrupted after a surge or component fault.
• Visible/Sensory Cues: Open fuse on continuity test, overheated fuse clips, discolored fuse holder, or repeated fuse failure.

Pro Tip: A fuse is a safety device, not the root-cause repair. If it opens again, diagnose the door-switch circuit and high-voltage components before returning the unit to service.

Technical Specifications