RESIDUAL CURRENT CIRCUIT BREAKER WITH OVERLOAD PROTECTION (RCBO)

Definition – It’s a single devise which performs the function of MCB (for protection from overloading & short circuit) & ELCB/RCCB (for protection from earth leakage).

Selection of RCBO

  • Check RCBO is required for single phase or 3 phase load.
  • Check number of poles – DP & 4P where

DP = Double Pole which means phase & neutral wires will be connected,

4P = Fore pole which means 3 phases & a neutral will be connected.

  • It should be capable to carry rated current of load&
  • Fault current rating (in mA) on which relay should trip/interrupts the faulty circuit.

Ex – 40A DP RCBO with 30mA fault current.

CURRENT RATING OF RCBOs

30mA DP –

A typical range of single phase RCBO – 6A, 10A, 16A, 20A, 25A, 32A, 40A, 63A.

100mA DP –

A typical range of single phase RCBO – 6A, 10A, 16A, 20A, 25A, 32A, 40A, 63A.

300mA DP –

A typical range of single phaseRCBO – 16A, 25A, 32A, 40A, 63A.

30mA 4P –

A typical range of Three phase RCBO – 6A, 10A, 16A, 20A, 25A, 32A, 40A, 63A.

100mA 4P –

A typical range of Three phase RCBO – 16A, 25A, 32A, 40A, 63A.

300mA 4P –

A typical range of Three phase RCBO – 16A, 25A, 32A, 40A, 63A.