Understanding the RCBO

The RCBO stands for Residual Current Circuit Breaker with Overcurrent Protection.¹ This device is engineered to provide complete electrical safety by triggering circuit disconnection when it detects two specific faults: an electrical overload or short circuit (overcurrent protection), and an electrical imbalance (residual current protection) which indicates a earth fault or a leakage current.

RCBO in the Törkmar Design

In the Törkmar electrical cupboard design, a 16A double-pole RCBO plays a critical protective role. It sits directly between the isolation transformer and the Quattro (the charger/inverter). Its primary function here is to safeguard the expensive Quattro unit by immediately disconnecting the supply if it senses an overcurrent fault, preventing damage. The residual current function also ensures protection against earth faults from the mains supply.