Live Electrical CB340B 3 Pole 40A B Curve 10kA MCB
The Live Electrical CB340B 3 Pole 40A B Curve 10kA MCB is a bi-directional miniature circuit breaker designed for suitable three-phase AC distribution systems. With a 40A current rating, 10kA breaking capacity and B curve tripping characteristic, it provides overload and short-circuit protection for commercial and industrial electrical installations.
Features and applications
The CB340B features a B curve thermal-magnetic trip mechanism, offering a relatively sensitive response to short-circuit currents. With instantaneous magnetic tripping typically occurring between three and five times the rated current, it is particularly suited to appropriately designed circuits with low starting currents, including resistive loads and selected distribution applications.
Its three-pole configuration provides linked switching across all three phases, while the 54mm-wide housing occupies three standard DIN rail modules. The breaker mounts onto a 35mm DIN rail and is intended for installation within compatible low-voltage distribution equipment.
Rated for 230/400V AC operation and featuring IP20 protection, the CB340B is manufactured to BS IEC/EN 60898. Appropriate cable sizing, fault current levels and disconnection requirements must be considered when selecting this protective device.
Technical specifications – Live Electrical CB340B 3 Pole 40A B Curve 10kA MCB
- Manufacturer: Live Electrical
- Part number: CB340B
- Rated current: 40A
- Number of poles: 3
- Tripping characteristic: Curve B
- Rated breaking capacity: 10kA
- Rated operational voltage: 230/400V AC
- Rated frequency: 50/60Hz
- Standard: BS IEC/EN 60898
- Ingress protection: IP20
- Mounting: 35mm DIN rail
- Width: 54mm
- Maximum cable terminal capacity: 16mm²
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Looking for equipment for your three-phase installation? View our Live Electrical TPN distribution boards, or explore the complete Live Electrical product range for additional circuit protection and electrical distribution products.
