Automatic power switch 4P 125A HIC412G

Automatic power transfer switch 4P 125A – continuous operation, but not interruption‑free

This is not a regular disconnect switch. It automatically transfers the load to a generator in the event of a utility failure, without the need for manual intervention. It is used in systems where power loss is not just an inconvenience but a safety issue – e.g., hospitals, data centers, logistics facilities, or installations with critical loads.

It has one main contact but two sources: utility and generator. It switches between them under load – the system does not need to be shut down before changing the source. All switching occurs in three stable positions: I (utility), 0 (off), II (generator). Automatic transfer operates based on voltage and frequency monitoring – if the utility disappears, the generator starts and, after it stabilises, the switch changes position.

Construction and installation – for the installer who knows what they’re doing

The device is permanently mounted to a mounting plate – it does not fit a DIN rail or front‑mounting. It is designed for installation in distribution boards, where space and accessibility are critical. It has cable clamps – there are no screws for busbar connections. Everything is linked directly by cables.

An integrated motor drive performs the entire transfer – no manual operation is required. It also features a locking mechanism – it can be physically locked (e.g., in the utility or generator position) using a standard hook. This is important for maintenance work.

It serves as a main disconnect, safety and maintenance switch – meeting all normative requirements for circuit isolation during service. It is not an emergency stop (there is no “STOP” button), but it includes a manual emergency drive – if the motor fails, you can switch manually.

What does this mean in practice?

• 125 A is the maximum continuous current – sufficient for most medium‑size commercial facilities.

• 100 kA Iq indicates it can withstand very high fault currents without damage.

• 82 kW at 400 V is the maximum power the device can safely transfer under load.

• IP00 – no protection against dust or water on the front. This is normal: the device is mounted inside a distribution board, so external environmental protection is not required.

• It switches under load, but is not a UPS system – there will be a brief interruption (a few seconds) during transfer.

• It has one normally closed auxiliary contact – usable for position signalling (e.g., “generator running”) in a SCADA system or control panel.

There is no optional drive or voltage trigger – everything is built‑in and ready to operate immediately after installation.

This device is not for aesthetics. It is intended to keep the lights on after a utility failure.