Details
An RCD protects by constantly monitoring the currentflowing in the live and neutral wires supplying acircuit or an individual item of equipment. Undernormal circumstances, the current flowing in the twowires is equal. When an earth leakage occurs due toa fault in the circuit or an accident with the equipment,an imbalance occurs and this is detected by theRCD, which automatically cuts off the power beforeinjury or damage can result.
To be effective, the RCD must operate very quickly at a low earth leakage current. Those designed to protect human lifeare engineered to trip out with an earth leakage current of 30mA within 200mS and at a higher earth current of 150mA, they will trip in less than 40mS. These limits are well inside the safety zone, within which electrocution or fire would not be expected to occur.
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