Stationary circuit breaker with Sentinel trip unit, 42 kA, 630 A, 4P HW1N406FB

Stationary circuit breaker with Sentinel trip unit, 630 A, 4P, 42 kA

This device is a fixed, air‑type circuit breaker intended for protecting industrial and commercial installations. It is designed as a central element in low‑voltage switchgear where high making capacity and reliability under extreme conditions are required. Its construction does not allow mounting on a DIN rail – it is mounted directly to the switchgear frame, providing rigidity and stability under high short‑circuit currents.

The rated continuous current is 630 A, and the short‑circuit rating at 400 V is 42 kA – meaning the device can safely interrupt very strong faults typical in large circuits with motors or transformers. The rated voltage covers the range from 440 V to 690 V, making it suitable for both 400 V systems and 500–690 V installations used in some industrial plants.

Built‑in auxiliary contacts – four changeover contacts – enable integration with control and signaling systems. There are no normally open or normally closed contacts, so the device is not used for transmitting on/off control signals, but only for status monitoring (e.g., by a PLC). A trip indicator is provided – allowing quick assessment of the device condition without opening the enclosure.

Connection of the main contacts is done via busbar – there are no screw or cable terminals. This means installation requires a pre‑installed busbar or busbar rail, which is typical in large switchgear. The device has no built‑in motor drive, but supports an optional drive – allowing remote operation or automation in the future without replacing the entire breaker.

The IP2X protection rating provides basic protection against accidental contact with live parts and objects larger than 12.5 mm – sufficient for closed switchgear. It does not include earth‑fault protection or an undervoltage trip – these functions must be added externally if needed.

This is not a “ready‑to‑use” breaker with a complete protection system – it is a pure switching device with a Sentinel trip unit (providing thermal‑magnetic tripping), but without additional protective functions. This gives flexibility: the installer can configure the whole system according to the circuit’s needs.

Installation requires precision: the lack of TH‑rail mounting means it must be placed on a special supporting structure. Note: this is not a “replace‑as‑you‑go” component like a standard overload breaker – its replacement is a service operation that requires shutting down the entire switchgear section.