Residual current circuit breaker
#1

Prepared by:
SHRIDHAR DAVE

[attachment=9511]
Residual current circuit breaker
HISTORY

 World’s first protective system is developed in South Africa by Henri Rubin.
 High sensitive earth leakage protective system
 Name of that was MAGAMP.
 It was second harmonic magnetic amplifier core balance system.
 Operated at 525 V and 250 mA.
INTRODUCTION
 RCCB is the circuit breaker that senses the fault current and trips when there is a difference between amount of current in line and neutral.
 objective
 Various names of RCCB and specifications
 As per NEC various rating of RCCB
 China is only the manufacturer in the world.
 Cost ranging from 1000 to 5 lacks and more.
 Used as household appliance and in transmission line.
TYPES
 RCCBO
 RCCBS
 As per characteristic
1. Type A
 Residual sinusoidal current
 Pulsating direct current
 Independent of polarity
2. Type AC
 Only residual sinusoidal current
3. Type B
 As for type A
 Residual current up to 1000 Hz
INTERNAL MECHANISM
1. Neutral
2. Line
3. Reset button (when pressed 4 & 5 get closed)
4. Contact
5. Solenoid
6. Sense coil
7. Sense circuitry (picked up because of differential current)
8. Test button
9. Test wire
CHARACTERISTICS
 Number of poles
 Two poles for single phase
 Three poles for three phase three wire
 Four poles for three phase four wire
 Rated current
 According to maximum sustained load
 Sensitivity
 As per IEC
 High sensitivity (6-10-30 mA)
 Medium sensitivity (100-500-1000 mA)
 Low sensitivity (3-10-30 A)
LIMITATIONS
 Alone RCCB can not protect overload and short circuit. For that RCCB with overload & short circuit protection must be provided.
 Household RCCB can not protect a person who touches live and neutral contact.
 Tripping of RCCB is nuisance for earth fault.
 To avoid such condition RCCB is available in 1, 2, 3, 4 pole.
CONCLUSION
 RCCB acts like a fuse in transmission line. it senses and trips the faulty line from the rest of the healthy line.
 The cost of one RCCB is less than the cost of relay unit and circuit breaker unit so RCCB is more economical than the unit of relay and circuit breaker.
 It occupies less space.
 For different types of the faults one RCCB is required so system is became more compact.
 The TOP of RCCB is less.
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