3-pole circuit breaker 40A BG1 NZMB1-A40 259075

The NZM..-A series circuit breaker is a compact solution suitable for a wide range of applications in electrical installations. The device is designed to protect installations and cables, and its installation is flexible thanks to the possibility of using modular function groups. This circuit breaker is characterized by a thermomagnetic release, providing effective protection against overloads and short circuits.

Characteristics and Application

This 3-pole circuit breaker with a rated current of 40A and a C characteristic is ideal for protecting circuits exposed to short-term current surges, e.g. during motor starting. The short-circuit capacity of 25 kA at 400V ensures safety in the event of serious failures. The device's construction allows for fixed mounting, and optionally also on a DIN TH rail. Frame terminals facilitate the connection of wires with a cross-section from 6 mm² to 16 mm² (multi-strand wires up to 70mm²).

Advantages and Benefits

• Versatility: NZM..-A circuit breakers are compatible with accessories used in the LZM/LN series, allowing for cost optimization and simplified storage.
• High reliability: The rated continuous current of 40A guarantees stable operation of the device even under heavy load.
• Safety: The rated short-circuit switching capacity (Icu) is as high as 25 kA at 400V, providing effective protection of the electrical installation.
• Installation flexibility: The possibility of fixed mounting and optionally on a DIN TH rail adapts the device to different installation conditions.
• Wide adjustment range: The adjustment range of the overload release from 32 to 40A allows for precise adaptation of the protection to the specifics of the circuit.
• Durability: The circuit breaker is designed for long-term operation, with a mechanical endurance of 20,000 operating cycles.

Technical Parameters and Construction

The circuit breaker has a protection class of IP20, which means protection against touching with fingers and solid objects with a diameter greater than 12.5 mm. Its construction is based on a durable design with a thermomagnetic release, which provides a quick response to overloads and short circuits. The device has a lever as an actuator and frame terminals for easy connection of wires. The rated voltage is 440V AC. An important aspect is also the possibility of adaptation to different working conditions thanks to the wide range of operating temperatures (up to 50°C while maintaining full efficiency).