Draw-out circuit breaker with sentinel trip unit 55kA 1600A 3P HW1M316DB

Drawout air circuit breaker with Sentinel trip unit, 1600 A, 3P, 55 kA

This device is a drawout air circuit breaker intended for use in medium‑ and high‑power switchgear where reliable protection of circuits against high fault currents is required. It is designed for operation in systems with voltages up to 690 V AC, and its making capacity at 400 V is 55 kA — meaning it can safely interrupt even very strong faults without damage.

The built‑in Sentinel trip unit allows precise setting of protection characteristics — although the breaker itself does not contain internal protection, it is ready for connection of an external trip module. This provides flexibility: the installer can match the protection to the specific load, e.g., for motors, transformers, or systems with high inrush current.

Construction and installation

The device features a drawout construction — this enables safe and rapid replacement without disconnecting conductors from the main circuit. Connections are made via a separate housing part, facilitating mounting and service. It is not intended for DIN‑rail mounting — it requires a fixed installation in a distribution cabinet.

It has three poles, all protected. A trip‑indicator on the housing allows quick assessment of the device’s status without opening the enclosure — important for fault diagnosis or technical inspection.

IP2X protection rating provides basic protection against contact with live parts — sufficient for installations in closed cabinets. There is no built‑in motor drive, but it can be added as an optional accessory — allowing remote control or system automation.

Benefits for the installer and user

• Service safety: The drawout design permits replacement or inspection of the device while the circuit is energized — no need to disconnect conductors.
• Protection flexibility: The absence of an integrated trip unit is not a limitation — it offers the possibility to fit a trip unit tailored to the specific task (e.g., time‑current, long‑time overload).
• Low internal resistance (50 µΩ): Minimizes power loss (358.6 W at Iu) — reducing heating and energy costs.
• High durability: 6000 electrical cycles and 25 000 mechanical cycles — the device is engineered for long‑term use under intensive conditions.
• Compliance with PN-EN 60947-2: Meets safety requirements for air circuit breakers in industrial installations.

There is no integrated earth‑fault protection or over‑voltage trip unit — if these functions are needed, they must be added as separate modules. This is not an “all‑in‑one” device — but it also means you do not pay for features you do not need.