BS Numbers for Circuit Breakers, Fuses, and RCDs
Introduction
In electrical installations, it is crucial to use components that meet the appropriate British Standards (BS) to ensure safety and compliance. This article provides a comprehensive list of BS numbers for common circuit breakers, fuses, and residual current devices (RCDs).Circuit Breakers
Circuit breakers are essential devices that protect electrical circuits from overcurrent conditions. The most common types of circuit breakers used in domestic and commercial installations are miniature circuit breakers (MCBs) and molded case circuit breakers (MCCBs).
The following table lists the BS numbers for common circuit breakers:
| Type | BS Number |
|---|---|
| MCBs | BS EN 60898 |
| MCCBs | BS EN 60947-2 |
Fuses
Fuses are another type of overcurrent protection device that operates by melting a thin wire when the current exceeds a predetermined value. The most common types of fuses used in electrical installations are rewireable fuses and cartridge fuses.
The following table lists the BS numbers for common fuses:
| Type | BS Number |
|---|---|
| Rewireable Fuses | BS 3036 |
| Cartridge Fuses | BS 1361 |
Residual Current Devices (RCDs)
RCDs are designed to protect against earth leakage currents that can occur in electrical systems, reducing the risk of electric shock. The most common types of RCDs used in electrical installations are portable RCDs and fixed RCDs.
The following table lists the BS numbers for common RCDs:
| Type | BS Number |
|---|---|
| Portable RCDs | BS 7071 |
| Fixed RCDs | BS EN 61008 |
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