Draw-out circuit breaker with sentinel trip unit 42kA 630A 4P HW1N406DB

Withdrawable air circuit breaker with Sentinel trip unit, 630 A, 4P

This device is a withdrawable air circuit breaker with a breaking capacity of 42 kA at 400 V, designed for use in distribution boards of medium‑ and large‑scale industrial facilities. Its construction allows safe and rapid replacement without disconnecting conductors – the entire unit is pulled out of the housing, which significantly reduces service time and minimizes the risk of installation errors.

Built‑in auxiliary switching contacts (4 pcs.) enable signalling of the device’s status – e.g., off, locked, or fault – without the need for external wiring. The trip indicator is an integral part of the enclosure, providing immediate visual information about the breaker’s condition even when the housing is concealed.

The main circuit connections are not fixed – they are made via a separate housing part. This solution offers mounting flexibility and easy adaptation to various busbars or cables, but requires precise installation by the electrician. The device is not intended for DIN‑rail mounting, and its IP2X protection class guarantees protection against contact with live parts, but does not protect against dust or water.

The rated continuous current of 630 A and voltage range of 440–690 V make it suitable for high‑load three‑phase networks – e.g., powering motors, transformers, or main switchboards. The closing time is 45 ms, which provides a fast response to faults, though it is not an “ultra‑fast” type. Total power loss at full load is about 39.4 W – a low value for a device of this class.

It does not include built‑in earth‑fault protection or an over‑voltage release – these functions must be added externally if required. An optional motorised drive (not standard) allows remote control of opening and closing – ideal for automation systems or remote monitoring.

Compliant with PN-EN 60947-2:2018+A1:2020 and PN-EN IEC 63000:2019 – meeting the latest safety requirements for low‑voltage equipment. Mechanical endurance exceeds 25 000 cycles and electrical endurance 6 000 cycles, guaranteeing long‑term reliability even in heavily used installations.

This is a solution for installers who need a robust, service‑friendly device without unnecessary functions – but with full control and expandability. For the end user, it means network stability and minimal downtime.