Single Phase RCCB
Connection Diagram and Working Principle.

  1. Single phase residual current circuit breaker(RCCB).
  2. Single phase RCCB connection diagram.
  3. Single Phase RCCB Working principle.
  4. Why it is used.

1- Single Phase RCCB-Residual Current Circuit Breaker:

RCCB is used for leakage current sensing. It is an electromechanical protective device which is used for prevention of leakage current, earth leakage. It is also provides protection against electrical shock.

Single phase RCCB: connection diagram and working principle.

It is very important for protection against earth fault because the earth fault may be cause for system heating, short circut , burning or shock. After sensing earth fault or shock then it will tripped and circuit will be open. So many reason is available for using RCCB.

2- Single Phase RCCB Connection Diagram.

Single phase RCCB: basic funtions.

3- Single Phase RCCB Working Principle:

Basic principle:

The basic function of RCCB is the same of Kirchhoff current law.

  • If incoming current vector sum and outgoing current vector sum is same then in this condition, RCCB will not be tripped.
  • If incoming current vector sum and outgoing vector sum is not same then it shows that current is leakage condition and RCC will be tripped.
Single phase RCCB: connection diagram and working principle.

It works on current basis. It detects leakage current. Phase outgoing current and neutral incoming current should be equal during without fault. When any phase touches with body then phase current will not be receive on neutral end point resultant phase flowing current and receiving current on neutral will not be equal. In that situation the RCCB will monitor preset value of leakage current like as 30 mA,100mA,300mA if the leakage current is more than preset value then it will interrupted the live circuit. In this way the equipment will be safe.

4- Why Single Phase RCCB is Used:

In domestic and industries many equipment and lighting circuits are used. Equipment live wire may be connect with metal body then the current will be pass on body. If any human touches equipment then he will get shock. So this condition is very dangers to the human. Other reason is due to leakage current, system may be heat or fire case in system.
So RCCB is used for equipment and human safety.

Go back to index ↑

Electrical and Mechanical Job Interview Training.
Get boost in your job or get new opportunity

Technical e book is used for storing data in soft formate which may be pdf, ms word or others as availability.

Electrical E-book

(Get important knowledge about industrial electrical, building maintenance in E-book )

HT system, LT system, Transformer, Electrical panel, Motor and Starter, Circuit breakers, Protection relays, Measuring meters.

Interview is a physical verbal communication activity which is performed between job seekers and employers so that skilled person could be selected.

Technical Interview

( Electrical system, Diesel generator, BMS, AC, Chiller plant,
UPS, WTP, STP, ETP, Fire and safety.)

electrician, maintenance supervisor, AC operator, chiller plant operator, DG operator, BMS operator, Shift engineer, Maintenance engineer, technical executive, sr. engineer, assistant facility manager,


Learn Fast and Improve Your Skill in Electrical Field Basic and practical theory, repair and maintenance, protection and testing.

For any query :- write to us as below mentioned email ..

For official :-

For technical information :-

For interview preparation :-
Subscribe for Get Latest Post Updates in Your Email Inbox
Join Free Email Service