Residual Current Circuit Breaker (RCCB) also called Earth Leakage Circuit Breaker (ELCB) is a device designed to disconnect the load from the supply mains, when the residual current (I∆n) is flowing in the circuit. The flow of currents in the electrical system is risky. Low quality faulty wires, poorly insulated equipments or incorrect use of electrical devices cause current to flow through the wrong path to the earth. This current is called “Leakage Current”.
Accidental contact with live parts of electric appliances cause earth leakage current to flow through the human body resulting in shocks that may be fatal. RCCB trips immediately under these circumstances and saves human lives. For e.g. when someone makes contact with a live electrical component of a device, touches a live bus bar in distribution panel or unprotected test cables or when a person sticks a metal object into a power socket or touches a live cable.
The metal enclosures of electric appliances can become live and cause electric shock to unwary persons touching them during an internal fault or insulation ailure. RCCB trips instantaneously and thus removes the possible risk from dangerous indirect contact. Indirect contacts are independent of humans, such as a person touching an electric metal frame. This is when a person makes contact with a metal earthed part which has accidently been powered up following an insulation fault. These type of contacts are very dangerous.
|Reference Standard||IS 12640 -1:2000, IEC 61008|
|Poles||DP & FP|
|Current Rating (In)||25A, 40A & 63A|
|Rated Voltage (Ue)||240/415V~ AC|
|Rated Residual Operating Current(I∆n)||30mA, 100mA & 300mA|
|Protection||Against Earth fault / Leakage Current|
|Operating Device||Current operating device|
|Rated Insulation Voltage(Ui)||440 V|
|Rated Conditional Short Circuit Current(Inc)||6kA|
|Rated Making Capacity(I∆m)||500A or 10In whichever is greater|
|Operating Characteristic||‘AC’ Type|
|Dielectric Strength||2.5 kV|
|Trip Time||Instantaneous < 40ms, Selective > 150ms|
|Operating Temperature||-5 to 50 ºC|
|Terminal Capacity||35 mm2 (max.) copper|
|Protection Class||IP 20|
|Contact Position Indication||Yes|
|Installation Position||Vertical / Horizontal|
|Mounting||Clip on Din rail ( 35 mm * 7.5 mm)|