Draw-out circuit breaker with sentinel trip unit 55 kA 1600 A 4P HW1M416DB

Air circuit breaker with sentinel trip unit, 1600 A, 4P, 55 kA

This is a draw‑out air circuit breaker designed for industrial and commercial installations where reliability at high rated currents and high short‑circuit capacities is required. It is built for operation in systems up to 690 V, and its making capacity of 55 kA at 400 V guarantees effective short‑circuit protection—even during sudden network surges.

Four built‑in auxiliary switching contacts allow integration with control and signalling systems (e.g., to indicate on‑, off‑, or fault status) without the need for additional relays. The device does not have make‑before‑break or break‑before‑make contacts, meaning auxiliary functions are limited to signal switching only.

The unit has no built‑in motor drive but supports an optional drive, providing flexibility for circuit automation. Installation is not on a DIN rail; the main circuit terminals are accessed through a separate housing section, facilitating service and replacement without dismantling the entire installation.

IP2X protection rating offers basic protection against accidental contact with live parts—sufficient for use in distribution cabinets. A standard trip indicator is provided, allowing quick assessment of device status without opening the enclosure.

There is no ground‑fault protection or under‑voltage release, meaning the function is focused solely on overload and phase‑fault protection. This solution is typical for systems where additional functions are handled by separate devices in the circuit.

For the installer: service simplicity and modularity

The draw‑out design enables safe removal of the device from the circuit without disconnecting conductors—significantly reducing service time and minimizing the risk of error during re‑installation. A separate housing section for the terminals makes cable replacement or connection checks easy during maintenance.

An optional motor drive allows later system upgrades—e.g., adding remote control or automatic re‑closing—without replacing the entire breaker.

For the user: stability and safety

At 1600 A and a short‑circuit rating of 55 kA, the device handles the large loads typical of industrial machinery—such as high‑power motors, production lines, or HVAC systems. It lacks unnecessary features that could increase cost or complicate operation—providing only what is essential for safe, continuous system performance.