![]() ![]() The sense coil (6) is a which surrounds (but is not electrically connected to) the live and neutral conductors. RCDs are usually testable and resettable devices. RCDs also cannot detect the situation where a human accidentally touches both conductors at the same time, since the current through an expected device, an unexpected route, or a human, are indistinguishable if the current returns through the expected conductor. Therefore, RCDs are often used or integrated as a single product along with some kind of, such as a fuse or miniature circuit breaker (MCB), which adds protection in the event of excessive current in the circuit (the resulting RCD with overcurrent protection called an RCBO). An RCD does not provide protection against unexpected or dangerously high current (called spikes or surges) when current is in the usual wires in the circuit, therefore it cannot replace a or protect against overheating or fire risk due to (overload) or if the fault does not lead to current leakage. RCDs are designed to disconnect the conducting wires quickly enough to prevent serious injury from such shocks, commonly described as the RCD being 'tripped'. ![]()
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