Residual Current Circuit Breaker with Over Current Protection RCBO/RCCB Wholesale


6~63A 1P+N,2P,3P,3P+N,4P, Residual Current Circuit Breaker with Over Current Protection RCBO/RCCB

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Residual Current Breaker with Over-Current protection (RCBO) is a safety device used in electrical systems that combines the functions of a Residual Current Device (RCD) and a Mini Circuit Breaker (MCB). An RCBO is designed to protect both people and equipment by detecting residual currents (leakage currents) and over-currents (overloads and short circuits). It is commonly used in residential, commercial, and industrial applications to enhance the safety and reliability of electrical installations.

The main features of an RCBO are:

Residual Current Protection

An RCBO constantly monitors the current flowing through the live (hot) and neutral wires of a circuit. Under normal conditions, the current flowing in both wires should be equal. However, if there is a leakage current (e.g., due to a faulty appliance or current flowing to the ground through a person), the RCBO detects the imbalance and trips, disconnecting the circuit to prevent electric shock.

Over-Current Protection

Similar to an MCB, an RCBO also offers protection against overloads and short circuits. Overloads occur when too much current flows through a circuit, usually due to too many devices being connected or a malfunctioning device. Short circuits happen when the live and neutral wires come into direct contact, resulting in an extremely high current flow. In both cases, the RCBO will trip and disconnect the circuit to prevent damage to electrical equipment, wiring, and reduce the risk of fire.

Combined Protection

By integrating both residual current and over-current protection in a single device, an RCBO provides comprehensive protection for electrical circuits, enhancing safety and reducing the need for separate RCDs and MCBs.

Easy Reset

Once the cause of the trip has been identified and resolved, the RCBO can be easily reset, restoring power to the circuit.

Residual Current Circuit Breaker with Over Current Protection RCBO/RCCB Wholesale

 Features and Benefits

  • Protection against overload and short-circuit currents
  • Protection against the effects of sinusoidal alternating earth fault currents
  • Protection against indirect contacts and additional protection against direct contacts.
  • Protection against fire hazard caused by insulation faults
  • Used in residential building
  • According to the type of instantaneous release classified as follows : type B(3-5)ln, type C(5-10)ln,type D(10-20)ln
Residual Current Circuit Breaker with Over Current Protection RCBO/RCCB Wholesale
Residual Current Circuit Breaker with Over Current Protection RCBO/RCCB Wholesale

Applications and Markets

  1. Residential Buildings: RCBOs are used in homes to protect circuits supplying power to areas where there is an increased risk of electric shock, such as bathrooms, kitchens, and outdoor circuits.
  2. Commercial Buildings: In commercial environments like offices, retail stores, and restaurants, RCBOs can protect circuits that supply power to appliances, lighting, and other equipment, ensuring the safety of occupants and property.
  3. Industrial Facilities: In industrial settings, RCBOs can be used to protect sensitive equipment, control panels, and machinery from electrical faults, minimizing downtime and damage.
  4. Medical Facilities: RCBOs are particularly important in hospitals, clinics, and other medical facilities, where they protect patients, staff, and medical equipment from electrical hazards.
  5. Educational Institutions: RCBOs are used in schools, colleges, and universities to protect students, staff, and electrical equipment from electrical faults and accidents.


What is a Residual Current Circuit-Breaker (RCCB)?

An RCCB is a mechanical switching device designed to make or break load currents under normal working conditions, and to automatically disconnect the contacts when the residual current reaches a predetermined value under specific conditions.

What is a Residual Current Device (RCD)?

An RCD is a protective device that disconnects the main circuit when the residual current in the circuit reaches a specified value under defined conditions, causing the contacts to operate. A residual current device may consist of a combination of components capable of detecting residual currents and making or breaking the main circuit current.

What are the basic technical requirements for leakage protectors?

In technical terms, Residual Current Devices (RCDs) must meet certain fundamental requirements:

  1. Sensitivity for Electric Shock Protection: The sensitivity must be correctly and reasonably set, with the general tripping current ranging between 15 to 30mA for personal protection. For equipment protection, the sensitivity should be chosen based on the equipment’s leakage current, typically ranging from 30 to 300mA.
  2. Tripping Time for Electric Shock Protection: Under normal circumstances, the tripping time should not exceed 0.1 seconds to ensure rapid disconnection in the event of a fault.
  3. Monitoring Equipment: The protector must be equipped with necessary monitoring devices to maintain protection effectiveness when operational states change. For voltage-type electric shock protectors, an earth connection for the neutral line should be installed.

What are Leakage protection functions by RCBO, RCCB, and RCD differences?

RCBO (Residual Current operated Circuit-breaker with Integral Overcurrent protection) refers to a residual current-operated circuit breaker that can perform overload and/or short-circuit protection functions, such as an integrated leakage circuit breaker.

RCCB (Residual Current operated Circuit-breaker) refers to a residual current-operated switch that cannot perform overload and/or short-circuit protection functions, essentially a leakage switch.

RCD (Residual Current Devices) refers to residual current-operated protection devices whose detection, judgment, and disconnection functions are independent of the power supply voltage, such as residual current-operated accessories.

What are the Classification Methods for Residual Current Circuit Breakers?

  1. Based on the Mode of Operation:
    • RCBOs (Residual Current Breakers with Overcurrent protection) that operate in relation to the power supply voltage (Electronic type).
      • Cannot automatically disconnect during power supply voltage failure.
      • Can trip in hazardous situations during power supply voltage failure (e.g., due to a ground fault).
    • Note: RCBOs with △n=30mA are tested according to section
  2. Based on the Device Type:
    • Fixed devices and RCBOs with fixed wiring.
  3. Based on the Number of Poles in the Current Circuit:
    • Single-pole RCBOs with one overcurrent protection pole and a non-breakable neutral line.
    • Two-pole RCBOs with one overcurrent protection pole.
    • Two-pole RCBOs with two overcurrent protection poles.
    • Three-pole RCBOs with three overcurrent protection poles.
    • Three-pole RCBOs with three overcurrent protection poles and a non-breakable neutral line.
    • Four-pole RCBOs with three overcurrent protection poles.
    • Four-pole RCBOs with four overcurrent protection poles.
  4. Based on the Adjustability of Residual Current:
    • RCBOs with only one rated residual operating current.
  5. Based on Performance Under Impulse Voltage to Prevent Nuisance Tripping:
    • RCBOs with normal resistance to nuisance tripping.
  6. Based on Performance with DC Components:
    • Divided into: a) Type AC RCBO; b) Type A RCBO.
  7. Based on Delay Time When Residual Current Occurs:
    • Instantaneous RCBOs: General-purpose type.
    • Delayed RCBOs: Selective type S.
  8. Based on Protection Against External Influences:
    • Enclosed RCBOs (do not require a proper casing).
  9. Based on Mounting Method:
    • Surface-mounted RCBOs.
  10. Based on Wiring Method:
    • RCBOs related to electrical connections and mechanical installation.
  11. Based on Instantaneous Trip Current:
    • Type C: 5In~10In
    • Type D: 10In~20In
  12. Type of Terminal Connections:
    • RCBOs with threaded terminal connections for external copper conductors.

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