Residual current circuit breaker Legrand 402075 — 40 A, 4-pole, 30 mA

Legrand residual current circuit breaker model 402075 is a 4-pole protective device rated at 40 A with a residual current sensitivity of 30 mA. It monitors leakage currents and automatically disconnects supply when an imbalance exceeds 30 mA, providing enhanced protection against electric shock and contributing to reduced fire risk. The device is intended for use in residential and light commercial distribution boards and is compatible with standard DIN-rail switchgear.

Advantages

The Legrand 402075 offers reliable earth-fault detection with a 30 mA trip threshold, compact 4-pole design for three-phase plus neutral installations, and a rated current of 40 A suitable for many domestic and small commercial circuits. Its DIN-rail compatibility simplifies installation and integration into existing distribution panels, while automatic disconnection improves overall electrical safety.

Suitable for

Key specifications

How to use

Mount the 4-pole RCCB on a standard DIN rail in the distribution board and wire the three phase conductors and neutral to the designated terminals according to the electrical schematic and local regulations. Ensure the breaker is installed upstream of the protected circuits and that the supply is de-energized during installation. After wiring, perform an insulation and polarity check, then energize and test the device using the built-in test function or appropriate test equipment to confirm correct tripping at fault conditions.

Recommendations

Install and commission the Legrand 402075 in accordance with national wiring rules and manufacturer instructions. Regularly test the device (for example, monthly using the test button) and arrange periodic inspections by a qualified electrician to ensure continued protective performance.