Cooper Bussmann S505-6.3-R Time Delay Fuse 6.3A Ceramic

Product Description

The COOPER BUSSMANN S505-6.3-R is a ceramic cartridge time delay fuse rated at 6.3 amps. It is a miniature fuse designed to protect low-current circuits by allowing brief inrush currents to pass without nuisance opening, while reliably clearing sustained overloads and fault conditions. The fuse measures 20 mm in overall length and 5 mm in diameter. Its ceramic body provides thermal stability and mechanical strength under fault conditions. Electricians and electronics service technicians install this fuse in control boards, instrumentation, and other low-voltage equipment where a mini cartridge fuse is specified.

This fuse is suited for residential and light commercial control circuit applications. It fits equipment and panel positions that accept a standard 5 mm x 20 mm mini cartridge fuse. Typical installations include HVAC control boards, power supplies, electronic instruments, and appliance protection circuits. The time delay characteristic makes it appropriate for circuits with motor start loads or transformer inrush where an instantaneous fuse would open unnecessarily.

Key Features

• 6.3 amp rating with time delay (slow-blow) fuse timing for inrush tolerance
• Standard 5 mm x 20 mm cartridge form factor for broad equipment compatibility
• Ceramic fuse body for high thermal stability and rupture containment
• Carries multiple international certifications including IEC 60127-2, CSA, CCC, BSI, KC-Mark, and MQ listings
• Miniature fuse type suited for low-current control and instrumentation circuits

Compatibility

Designed as a direct replacement for equipment requiring a 5 mm x 20 mm time delay cartridge fuse rated at 6.3 amps. Consult the equipment nameplate or service manual to confirm fuse type, amperage, and voltage rating before installation.

Installation Notes

This fuse should be installed by a qualified electrician or trained service technician. Always de-energize and lock out the equipment before replacing a fuse. Verify that the replacement fuse matches the original in amperage, time delay characteristic, and physical size. Never substitute a higher-amperage fuse or bypass the fuse holder.