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RCCB (Residual Current Circuit Breaker)

RCCB are important safety measures for protecting electrical circuits. This current-sensing device automatically disconnects a circuit when a fault occurs, or the current exceeds its sensitivity.

Designed to protect an individual from shocks, electrocutions, and fires, an RCCB is especially helpful in cases of earth faults that occur suddenly. As a result, an RCCB ensures that an electric shock will not occur in such cases since it trips the circuit immediately.

Principle behind RCCB

As stated by Kirchhoff’s law, RCCBs work by matching the incoming current with the outgoing current in a circuit. This allows an RCCB to compare live and neutral wire current values. The live and neutral wires should have the same current flowing to the circuit. If a fault occurs, the residual current is the differential between the neutral wire current and the fault current.

RCCBs also have a test button that allows users to test their functionality by creating a small leakage current. By pressing the test button, the live wire on the load side is connected to the supply neutral, bypassing the neutral coil of the RCCB. This causes an imbalance in currents and fluxes, which should trip the RCCB. This means the RCCB must be replaced or repaired if it does not function correctly.

Advantages and Disadvantages of Residual Current Circuit Breakers

Some of the advantages of using RCCBs are:

  • Simple test and reset buttons make them easy to install and use.

  • This device provides protection against earth faults as well as leakage currents.

  • It disconnects the circuit automatically when its sensitivity exceeds its rating.

  • Suitable for both cable and busbar connections with dual terminations.

  • In addition to protecting against voltage fluctuation, it includes a transient voltage filter.

Some of the disadvantages of using RCCBs are:

  • In the absence of standard waveforms, the RCCB will not function. The main reason is that RCCBs are designed to operate with normal supply waveforms.

  • RCCB might trip unintentionally. Due to sudden changes in electrical load, especially in old appliances, a small current can flow to the earth when there is a sudden change in electrical load.

  • RCCBs do not protect against current overload. It covers only when the live and neutral currents are different. Despite this, detecting an excess of current is impossible.

  • The RCCB does not protect against shocks caused by line neutrality. This is mainly due to the balanced current in them. By holding both terminals together, the current is balanced.

  • The RCCB does not protect from overheating caused by improperly screwed conductors.

How to Choose and Install a Residual Current Circuit Breaker

To choose the right RCCB for a circuit, the following factors should be considered:

  • The type of load and current RCCBs should protect loads of different types (AC, DC, high-frequency) and currents of different types (pure, pulsating, smooth).

  • The rated residual operating current (I∆in) A RCCB must have a low residual operating current to provide adequate protection against electric shocks but not too low to cause nuisance trips.

  • The rated current (In) The RCCB should be able to handle the normal operating current of the circuit without exceeding the capacity or fuse of the MCB or fuse.

  • The number of poles An RCCB should have the same number of poles as its supply voltage.

To install an RCCB, the following steps should be followed:

  • You need to turn off the main power supply and isolate the circuit that needs to be protected by an RCCB.

  • From the supply side, connect the live wire(s) to the input terminal(s) of the RCCB marked L1, L2, and L3.

  • From the supply side, connect the neutral wire to the N input terminal of the RCCB.

  • The load-side live wire(s) should be connected to the RCCB’s L1, L2, and L3 output terminals.

  • The neutral wire should be connected to the output terminal marked N’ on the RCCB.

  • Make sure all connections are tight and secure and no wires are exposed or loose. Test the RCCB by turning on the main power supply and pressing the test button.

  • Ensure that the RCCB trips and disconnects the circuit if it does not, and fix any wiring errors or faulty components before using the circuit.

  • Press the reset button on the RCCB to reset it. Using the circuit requires closing and reconnecting the RCCB, checking for wiring or component errors, and fixing them if necessary.

Classification of RCCB

Classification of RCCBs is based on their number of poles:

  • 2 Pole RCCB This is used when there is only a live and a neutral wire on a single-phase supply connection.

  • 4 Pole RCCB This is used when a three-phase supply is used.

BCH RCCB’s competitive advantage

BCH has contributed to the design of reliable RCCBs that meet every safety standard. With high performance and multiple commercial applications, our RCCB meets all industry standards.

RCCBs detect leakage currents to the ground and interrupt electrical circuits when they detect them. As a result of faulty wiring, insulation failure, or contact with live parts, it protects people and equipment from electric shocks, fires, and other hazards.

In addition to Wintrip RCCB, BCH offers a state-of-the-art product specifically designed for industrial, commercial, and residential use.

Some of the essential benefits of BCH RCCB are:

  • RCCBs are designed to protect humans from residual currents.

  • As well as protecting against electrical shock, it protects against earth faults.

  • When the rated sensitivity is exceeded, the circuit is automatically disconnected.

  • By including a filtering device, it protects against transient voltage fluctuations.

  • Both cable and busbar connections can be dual terminated.

The products from BCH Electric Limited are committed to meeting the industry’s higher standards of safety, dependability, and performance. Moreover, it ensures a longer service life and a more convenient application process. Using our trusted RCCBs, we guarantee the safety of electrical systems in all industries and households.

Specification and Features

  • Range -25A, 40A, 63A
  • DP( 1P+N), FP ( 3P+N)
  • Rated sensitivity
    • 30mA : Provides high level of protection to living being against direct & indirect contact.
    • 100mA : Is suitable for indirect contact and leakage current for larger installations.
    • 300mA : Is less sensitive, suitable for larger installations having high levels of leakage current.
  • Rated voltage Un 2P:240V , 4P :415V
  • Rated condition short circuit current -6kA
  • IP category – IP20
  • Conformance to standards :IS 12640 (Part 1), IEC/EN 61008-1


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