Bussmann S500-80-R Glass Fuse 80mA 250V 35A 5PK line protection

What it is

The Bussmann S500-80-R is a pack of five fast-acting glass fuses rated at 80 mA and 250 V AC. They are designed for line protection in low-current circuits where a quick response to overcurrent is required. Each fuse has an interrupt rating of 35 A at 250 V AC. The cylindrical body measures 20 mm in length and 5 mm in diameter. They suit technicians and hobbyists maintaining equipment that uses this specific fuse size and rating.

Build and fit

The glass body lets you inspect the element visually after a fault. The non-rejection style means they fit standard 5 mm x 20 mm fuse holders without a keyed slot. They are compatible with HTB series fuse blocks and match the Bussmann GDB, S500, Littelfuse 217 and Mersen GSB series. The single-element construction provides straightforward overcurrent protection. CE, CSA and UL Guide JDYX2 markings confirm compliance with recognised safety standards.

Deciding spec

The critical figure is the 80 mA current rating; the fuse will open quickly if current exceeds this value. Verify that your circuit demands exactly this rating and a 250 V AC voltage rating before fitting. Using a higher or lower amperage fuse will not protect the circuit correctly. The 35 A interrupt rating shows the maximum fault current the fuse can safely break at 250 V AC.