RCBO Connection Diagram and Wiring Procedure

Hey, in this article we are going to see the RCBO connection Diagram and its wiring procedure. RCBO full form Residual Current Circuit Breaker with Overcurrent protection. RCBO is the combination of RCCB and MCB. We know that the RCCB can give leakage current protection by operating on the principle of residual current and the MCB gives protection against overcurrent fault. As the RCBO can give both of the leakage current and overcurrent protection which is why it is called a Residual current circuit breaker with overcurrent protection. Nowadays, in modern electrical systems such as distribution boards, control panels, and motor panels, in fact, lighting panels RCBOs are used instead of MCB and RCCB. So when we connect an RCBO there is no need to connect an additional MCB.

RCBO is a single device that can provide the facilities of two different devices. So using RCBO is very cost-effective and required a compact installation area. Both Single Phase and Three(3) Phase RCBOs are available in the market. 2 Pole RCBO is used for a single phase. 3 Pole and 4 Pole RCBO are used for a three-phase system.

RCBO Connection Diagram

Here, you can see the connection diagram of both the Single phase and 3-phase RCBO. Here, a 4-pole RCBO is shown.

RCBO Wiring Procedure

Single Phase/Double(2) Pole RCBO

1. Connect the Phase terminal of the input power to the input phase terminal of the RCBO(Here upside left).
2. Connect the Neutral terminal of the input power to the input neutral terminal of the RCBO(Here upside right).
3. Connect the Phase terminal of the load circuit to the output phase terminal of the RCBO(Here downside left).
4. Connect the Neutral terminal of the load circuit to the output neutral terminal of the RCBO(Here downside right).

**Here, the RCBO shown in the above figure has input terminals at the upper side and output terminals at the bottom side but your RCBO may have its opposite so before making the connection check the identification of the Input and Output terminals**

Three(3) Phase/ Four(4) Pole RCBO

1. Before connecting check the identification of inputs outputs and line and neutral terminals. If it is the same as the above follow the below procedure.
2. Connect the Neutral terminal of the input power to the input neutral terminal of the RCBO(Here upside left).
3. Connect all three Phase or Line terminals of the input power to the input phase terminals of the RCBO(Here upside right three terminals).
4. Connect the Neutral terminal of the load circuit to the output neutral terminal of the RCBO(Here downside left).
5. Connect all three Phase or Line terminals of the load circuit to the input phase terminals of the RCBO(Here downside right three terminals).

Three(3) Phase/ Three(3) Pole RCBO

The 3-pole RCBO also has the same connection as the 4-pole RCBO just the difference is there is no neutral.

After connecting the RCBO with the power supply must push once the trip button to check whether it is working or not. Some RCBOs have only one push button switch for the manual trip and some have two push buttons one for the manual trip and one for reset. When the RCBO trip due to an overcurrent fault you need to push the RESET button to take it again in operating mode. In fact, most of the RCBOs have an indication window so you can easily identify whether the RCBO tripped due to the leakage current fault or overcurrent fault.

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