- Contactum two module RCBOs feature a two part, partially interlocked operating switch which when tripped, discriminates between an overcurrent fault and an earth fault. If an earth fault has occurred, or the test button has been pressed, then both parts of the switch will be in the OFF position and a red indicator will display that the RCBO has interrupted the supply
| - This combination allows earth fault protection to be restricted to a single circuit, thus ensuring that only the circuit with the fault is interrupted (When groups of circuits are protected by an RCD, all circuits would be interrupted under fault conditions, which may cause unnecessary inconvenience).
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