Circuit Breaker GACIA N8BH 10kA C 3P 40A — 3‑pole overcurrent protection, 10 kA breaking capacity

GACIA N8BH 10kA C 3P 40A is a three‑pole overcurrent circuit breaker designed for protection of three‑phase electrical installations. It is intended to interrupt current in case of overloads and short circuits, combining a C‑type tripping characteristic with a rated operational current of 40 A. With a breaking capacity of 10 kA it limits fault energy and helps protect wiring, busbars and connected equipment in residential, commercial or light industrial distribution panels.

Advantages

The device provides coordinated short‑circuit and overload protection for three‑phase circuits while occupying a compact footprint on standard DIN rail. Its C‑type characteristic offers selective tripping for moderate inrush currents typical of motors and lighting circuits, reducing nuisance trips during startup. The 10 kA breaking capacity ensures reliable interruption of fault currents up to the specified level, and the three‑pole design disconnects all phases simultaneously for safer fault clearance.

Suitable for

• Protection of three‑phase branch circuits in residential distribution boards
• Overcurrent protection for small commercial and light industrial installations
• Safeguarding motor feeders and lighting circuits with moderate inrush currents
• Use in retrofit and new installation projects requiring coordinated protection

Key specifications

• Poles: three‑pole design providing simultaneous phase disconnection
• Rated current: 40 A operational current capacity
• Tripping curve: C‑characteristic suitable for moderate inrush applications
• Breaking capacity: 10 kA short‑circuit interrupting capability
• Mounting: DIN‑rail compatible form factor for standard distribution panels
• Application: intended for three‑phase overcurrent protection in distribution systems

How to use

Install the circuit breaker on a compatible DIN rail inside the distribution board, ensuring correct orientation and secure mechanical engagement. Connect the incoming supply conductors to the line terminals and the load conductors to the load terminals, observing correct phase sequence. Tighten terminals to the manufacturer’s recommended torque and verify that the device is accessible for manual operation. Commission the protected circuit by checking continuity, insulation resistance and correct operation of upstream and downstream protective devices before energizing.

Usage recommendations

Select the breaker based on load current, type of load and coordination with upstream devices. For circuits with high startup currents or specific selectivity requirements, evaluate time‑delay coordination and upstream protection settings. Periodically inspect terminals for tightness and signs of overheating; replace the device after a major fault event or if mechanical operation becomes unreliable.