Circuit breaker Icu=50kA 1P C 40A HMX140

Protects circuits with motors and devices with high inrush current

Characteristic C allows the circuit breaker to delay its response to short‑duration current flows — those that occur when starting pumps, fans or compressors. It does not trip unintentionally during start‑up, but still reacts effectively to sustained overloads and short circuits. This is a key feature for installations in farms, workshops or homes with heat pumps.

Installation in distribution and surface‑mounted cabinets — without additional components

Designed for mounting on a DIN rail, it occupies 1.5 modules. A height of 90 mm and depth of 70 mm allow compact placement in standard cabinets. Surface‑mount installation is supported without the need for additional guards or brackets — a screw clamp is sufficient. Single‑core conductors up to 70 mm² and multi‑core up to 50 mm² can be connected directly — no terminations required.

Resistant to environmental conditions and compliant with standards

Operates in temperatures from -25 °C to +70 °C — suitable for unheated rooms, roofs or garages. An IP20 protection rating provides basic protection against touch and dust, but it is not intended for wet installations. Energy‑limiting class 3 and a surge voltage rating of 6 kV enable the breaker to handle over‑voltages typical of municipal and industrial networks. Compliant with IEC 60947-2 and CE directives — the declaration of conformity is available to any installer.

Single‑pole connection, without neutral disconnection

Single‑pole (1P) — protects only the phase conductor. The neutral is not automatically disconnected, which is standard for single‑phase circuits in residential and light‑industrial installations. Clamp tightening torque: 3.6 Nm — a regular screwdriver with torque setting is sufficient. No special equipment required.

Durability for over 20 k mechanical cycles

Designed for daily use — it can be manually switched on and off over 20 000 times without loss of performance. Electrical endurance (4000 cycles) guarantees stable operation even with frequent fault clearings. A rated short‑circuit capacity of 50 kA at 230 V and 400 V means the breaker can handle the highest fault currents typical of modern installations.