3-pole power circuit breaker 800A NZMN4-AE800 265759

3-pole circuit breaker 800A NZMN4-AE800

The device is designed for permanent mounting — it cannot be installed on a TH35 or DIN rail. Main circuit terminals are located at the front and feature screw connections, ensuring durability and low resistance under high currents. There is no trip indicator; therefore, the device status must be monitored externally — e.g., via auxiliary contacts or panel signaling.

The rated continuous current is 800 A, suitable for protecting main three-phase circuits in industrial facilities, office buildings, or logistics centers. The overload release adjustment range spans from 400 A to 800 A, allowing protection to be tailored to the load characteristics, such as motors or equipment with high inrush currents, without nuisance tripping.

The short-circuit release operates instantaneously, with an adjustment range from 1600 A to 9600 A. The rated short-circuit breaking capacity at 400 V and 50 Hz is 37 kA, as specified by the manufacturer in the technical data. This means the circuit breaker can safely interrupt short circuits under typical low-voltage installation conditions — without risk of damage to the device itself.

There is no built-in undervoltage release or ground fault protection — these functions are not available in this version. The IP20 protection rating requires installation exclusively inside enclosures; it does not protect against dust or moisture.

An optional motor operator can be added later — e.g., model NZM4-XR208-240AC — enabling remote control and automation. It is not integrated but the design allows its installation as an accessory.

The circuit breaker operates with an electronic release that provides protection for installations and cables by measuring RMS values and utilizing thermal memory — it responds not only to current magnitude but also to the duration of current flow. This is a key feature for selectivity and long-term system stability.

There are no auxiliary contacts (normally open, normally closed, or changeover); therefore, additional control functions require external equipment. Terminals are screw-type only — plug-in or withdrawable options are not available.