Bussmann
Bussmann S505-4-R Ceramic Fuse 4A 250V AC 1.5kA 5 PK line protection
Pack of five 4 A ceramic time-delay fuses rated 250 V AC with 1.5 kA interrupt capacity
- Time-delay operation protects against nuisance tripping
- 5 kA interrupt rating at 250 V AC handles fault currents
- Ceramic body provides reliable insulation and durability
- 20 mm × 5 mm cylindrical size fits standard fuse blocks
- Pack of five ensures spares for maintenance
EATON BUSSMANN S505 4A ceramic fuse 5-pack
The EATON BUSSMANN S505 series ceramic fuse provides 4 A time-delay protection at 250 V AC with a 1.5 kA interrupt rating. Each cylindrical fuse measures 20 mm by 5 mm and carries BSI, CCC, CSA, IMQ, SEMKO, UL and VDE approvals. A pack contains five non-indicating, non-rejection fuses compatible with HTB fuse blocks.
Suits low-current AC line protection not
These fuses suit low-current AC line protection where a time-delay characteristic prevents nuisance opening on inrush. They are not for high-energy DC circuits, semiconductor protection or applications that require a filled-tube or high-breaking-capacity fuse. Buyers who need visual indication, a rejection-style body or a higher interrupt rating should select a different series.
1.5 kA interrupt rating at 250 V AC decides fit
The single specification that decides fit is the 1.5 kA interrupt rating at 250 V AC; the circuit's prospective short-circuit current must stay below this value. If the available fault current exceeds 1.5 kA, the fuse cannot safely clear the fault and a higher-rated device is required.
Highlights
- Time-delay operation protects against nuisance tripping
- 5 kA interrupt rating at 250 V AC handles fault currents
- Ceramic body provides reliable insulation and durability
- 20 mm × 5 mm cylindrical size fits standard fuse blocks
- Pack of five ensures spares for maintenance
Specifications
| Brand | EATON BUSSMANN |
|---|
Questions about this item
Does the 4 A ceramic fuse need periodic replacement even if it has not blown?
No scheduled replacement is required; the fuse remains in service until an over-current event opens the element.
What stops the fuse from carrying current continuously at its 4 A rating?
The time-delay element tolerates brief surges but will melt if the 4 A load persists beyond its thermal limit.
How much heat does a single 20 mm × 5 mm fuse generate when running at 4 A all day?
Power loss is low at rated current; the ceramic body dissipates the small wattage without forced cooling.
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