Automatic power switch with measurement and communication, 4P 800A HIC480E

Automatic power switching with communication and measurement

This device is a reversing switch with motor drive, designed for automatic switching between two power sources — e.g., public grid and generator. It operates in I-0-II mode, which provides three stable positions: “grid”, “zero” and “generator”. Switching occurs under load, but with a brief interruption of power — it is not an uninterrupted power supply (UPS).

The built‑in EPS controller (Emergency Power Supply system) monitors the parameters of both sources: voltage, frequency and phase sequence. When one source becomes unavailable (e.g., grid outage), the system automatically transfers the load to the other — without manual intervention. Remote control via pulse signals or hold on control terminals is also possible.

Construction and installation

The unit is supplied as permanent panelboard equipment — it is not mounted on a DIN rail or front panel. It has four poles and is connected using cable clamps that accommodate conductors from 35 mm² to 300 mm² (depending on version). The internal construction contains two separate disconnectors that mechanically interlock — both circuits cannot be closed simultaneously.

It features a locking mechanism that allows a padlock to secure the “0” position — a key function for service or maintenance work. An emergency manual drive lever (for storage) enables manual switching even without auxiliary power.

Benefits for the installer and the user

• Automatic load‑under‑load switching — loads do not need to be turned off before changing the source.

• Integrated EPS controller with LED indicators and LCD display — provides quick diagnosis of grid I/II status, device position and errors.

• RS485 / MODBUS / Ethernet communication — can be connected to BMS or SCADA systems via optional modules (up to 4 additional).

• Auxiliary contact (NO) — signals the current position (I or II) to monitoring systems.

• Short‑circuit protection up to 50 kA — meets requirements for industrial and commercial installations.

• Compliance with DIN EN 60947-3 and DIN EN 60947-6-1 — fulfills standards for emergency and reversing disconnectors.

• Capability to operate at 208–277 VAC auxiliary supply — flexibility in configuration.

It is not an emergency switch (NOT-AUS), but serves as a main, safety and maintenance disconnect, making it essential in generator systems where physical circuit isolation is required.

All functions are factory‑set to typical levels for most applications — detailed configuration (voltage thresholds, delay times) is performed via the front panel using buttons and the LCD menu.