The Holistic Neutral Earth Protection system (HNER) ensures safety and compliance by continuously monitoring the resistive value of the earth fault limiting Resistor (NER) and the neutral current.

Programmable via the door-mounted HMI, each relay can monitor Neutral resistor values 10Ω to 650Ω ohms, usable at system voltages up to 4000V AC Phase to Phase.

Remote diagnostics and monitoring are available via Modbus RS485 and analogue connections.
Modbus provides real-time protection settings, measured values, relay status, and earth leakage levels.
It supports Modbus ASCII and Modbus RTU protocols, along with logs of the last 20 events with date and time.