WCED PME loss unit - Type A 40A RCBO

PME (Protective Multiple Earthed) protection is a safety feature in electrical installations. Some EV chargers require specific PME fault detection and protection, which this unit provides if the charger itself lacks it, preventing potential electric shock hazards.

The unit operates normally between 207V and 253V AC.

It isolates the Live, Neutral, and Earth connections within 4 seconds of detecting an under-voltage (below 207V) or over-voltage (above 253V) condition.

No, following an over-voltage isolation, the unit requires a manual reset by pressing the "RED" button. This is a safety feature.

Type A indicates the RCBO can detect both sinusoidal AC residual currents and pulsating DC residual currents. This offers broader protection against various fault types.

While designed with EV chargers in mind (especially those needing PME loss protection), it can be used on any 40A circuit requiring voltage monitoring and RCBO protection, provided it meets the installation requirements.

The WCED WMEPME06/C40 has a rated conditional short circuit current of 16kA.

This could indicate a fault in the connected EV charger or wiring. Check for short circuits or incorrect wiring. Ensure the main device (RCBO) is correctly rated for the circuit.

This is by design for safety. Ensure the over-voltage condition has been resolved, then manually press the "RED" reset button firmly.

Verify the main power supply is active. Check if an under-voltage or over-voltage isolation has occurred by observing the unit's status. If isolated due to under-voltage, wait for the supply to normalize; if over-voltage, press the red reset button after confirming stable supply.

This may indicate an overload or earth leakage issue. Check the EV charger's current draw against the unit's 40A rating. If the issue persists, consult an electrician to diagnose potential earth faults or RCBO malfunction.