Residual-current circuit breaker 4P 25A 0.03A Type AC EATON xPole Home HNC-25/4/003

The Residual-current circuit breaker 4P 25A 0.03A Type AC EATON xPole Home HNC-25/4/003 is a four-pole RCD designed for protection against earth leakage in residential and light-commercial electrical installations. It provides 25 A rated current and a residual current trip sensitivity of 30 mA (0.03 A) for sinusoidal AC-type leakage currents. The device is intended for DIN-rail mounting and isolates the electrical supply when a leakage to earth is detected, reducing the risk of electric shock and limiting fire hazards caused by insulation faults.

Advantages

The device offers selective residual-current protection across all four poles, ensuring simultaneous disconnection of three phases and neutral where required. Its 30 mA sensitivity balances personnel protection and nuisance trip avoidance for common residential loads. Compact housing suitable for standard DIN-rail distribution boards allows straightforward installation and integration with other protective devices. The Type AC characteristic is appropriate for circuits where leakage currents are predominantly sinusoidal.

Suitable for

• Single-family and multi-family residential distribution boards
• Small commercial and light-industrial installations with sinusoidal leakage currents
• Protection of circuits supplying lighting, sockets, and domestic appliances
• Applications requiring four-pole isolation across three-phase systems with neutral

Key specifications

• Poles: 4-pole residual-current device
• Rated current: 25 A
• Residual current sensitivity: 0.03 A (30 mA)
• Type: AC (responds to sinusoidal alternating leakage currents)
• Mounting: DIN-rail compatibility for standard distribution enclosures
• Action: instantaneous earth-fault detection and supply disconnection

How to use

Install the breaker on a standard DIN rail inside the distribution board following applicable electrical regulations and turning off the supply before work. Connect the three phase conductors and neutral to the corresponding terminals and ensure proper tightening to manufacturer torque recommendations. The device operates automatically: it continuously monitors residual current and trips to disconnect the supply when leakage above 30 mA is detected. After a trip, identify and remedy the fault in the circuit before resetting the breaker manually.

Usage recommendations

Use this four-pole residual-current breaker where simultaneous disconnection of phases and neutral is required, for example in three-phase residential or light-commercial installations. Verify compatibility with existing distribution components and with loads that may generate non-sinusoidal leakage currents; consider a different RCD type if electronic equipment produces DC or complex leakage patterns. Periodically test the device according to local standards and replace if it shows signs of mechanical wear or fails self-tests.