Bussmann
Bussmann S506-4-R Glass Fuse 4A 250V AC 40A Interrupt 5 Pack
Time-delay glass fuse rated 4 A at 250 V AC with a 40 A interrupt rating, supplied in a pack of five
- Time-delay operation protects against nuisance trips
- 40 A interrupt rating at 250 V AC handles fault currents
- Glass cylindrical body 20 mm x 5 mm fits standard holders
- cURus, IMQ and MITI/JET recognition confirms compliance
- Pack of five provides ready spares for maintenance
Purpose and Rating
This glass tube fuse is rated at 4 amps and 250 volts AC with a 40 amp interrupting capacity. It suits low-power circuits in appliances, controls or automotive accessories where a time-delay characteristic prevents nuisance blowing during brief inrush currents. The 5 mm by 20 mm cylindrical body fits standard fuse holders and HTB series blocks. The pack contains five identical units for spares or multiple installations.
Time-Delay Behaviour
The single-element time-delay design tolerates temporary overloads such as motor start-up or transformer energising without opening immediately. This reduces unnecessary replacements compared with fast-acting types while still interrupting a sustained fault at up to 40 amps. The glass body allows visual confirmation of a blown element. No rejection feature is fitted so the fuse can be used in non-rejection clips.
Interrupt and Standards Limits
The 40 amp interrupt rating at 250 volts AC defines the maximum prospective short-circuit current the fuse can safely clear; circuits with higher available fault current require a different protection device. The component carries cURus recognition under guides JDYX2 and JDYX8 plus IMQ and MITI/JET 1641-31003-1005 approvals. It is not rated for DC voltages or for interrupting capacities above the stated 40 amps.
Highlights
- Time-delay operation protects against nuisance trips
- 40 A interrupt rating at 250 V AC handles fault currents
- Glass cylindrical body 20 mm x 5 mm fits standard holders
- cURus, IMQ and MITI/JET recognition confirms compliance
- Pack of five provides ready spares for maintenance
Specifications
| Brand | EATON BUSSMANN |
|---|
Questions about this item
How often should I replace the 4 A time-delay glass fuse in continuous service?
Replace the fuse only after it has opened; a correctly rated 4 A time-delay fuse does not wear out and needs no scheduled swap.
What is the first limit reached when the fuse carries its rated 4 A for hours?
The element runs at its design temperature; the 40 A interrupt rating at 250 V AC is the hard ceiling, not thermal drift.
Does the glass body get hot or make noise during all-day operation?
The cylindrical glass body stays silent and only warms to normal operating temperature at 4 A load.
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