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CIRCUIT BREAKER

CIRCUIT BREAKER IS A MECHANICAL
SWITCHING DEVICE CAPABLE OF MAKING ,
CARRYING AND BREAKING SERVICE CURRENTS.

IT SHALL ALSO MAKE , CARRY FOR
A SPECIFIED TIME AND BREAK UNDER SPECIFIED
ABNORMAL CONDITIONS SUCH AS A SHORT
CIRCUIT .

LVSM8.PPT/NRS

BASIC FUNCTIONS OF A CIRCUIT BREAKER

TO MAKE, CARRY & BREAK SERVICE CURRENTS

TO PROTECT THE SYSTEM AGAINST ABNORMAL
CONDITIONS LIKE OVER LOAD, SHORT CIRCUIT
AND EARTH FAULT

TO PROVIDE THE RIGHT DISCRIMINATION TO
ENSURE CONTINUOUS SUPPLY TO ALL
HEALTHY FEEDERS IN CASE OF A FAULT
ON ONE FEEDER

TYPES OF L.T. CIRCUIT BREAKERS
OIL CIRCUIT BREAKERS
AIR CIRCUIT BREAKERS

MOULDED CASE CIRCUIT BREAKERS

MINIATURE CIRCUIT BREAKERS
MOTOR PROTECTION CIRCUIT BREAKERS

CONTACT MECHANISM OF ACB

ARC CHUTE
ARCING CONTACT

ARC

BUTTONS

LVSM8.PPT/NRS

AIR CIRCUIT BREAKER

MANUALLY
OPERATED

FIXED TYPE
DRAW OUT TYPE

ELECTRICALLY
OPERATED

FIXED TYPE
DRAW OUT TYPE

LVSM8.PPT/NRS

AVAILABLE RATINGS

1000 AMPS

2000 AMPS

4000 AMPS

630 AMPS

1250 AMPS

2500 AMPS

5000 AMPS

800 AMPS

1600 AMPS

3200 AMPS

6300 AMPS

UTILISATION CATEGORIES

A

CIRCUIT BREAKERS NOT INTENDED FOR
SELECTIVITY UNDER SHORT CIRCUIT
CONDITIONS AND THEREFORE WITHOUT
A SHORT TIME WITHSTAND CURRENT.

B

CIRCUIT
BREAKERS
INTENDED FOR
SELECTIVITY UNDER SHORT CIRCUIT
CONDITIONS AND THEREFORE WITH A
SHORT TIME WITHSTAND CURRENT.

CIRCUIT BREAKER SELECTION - PARAMETERS
1.
2.
3.
4.
5.
6.
7.

CURRENT RATING & VOLTAGE
SHORT CIRCUIT BREAKING CAPACITY
SHORT CIRCUIT MAKING CAPACITY
UTILISATION CATEGORY
VERSION
TYPE OF OVER CURRENT PROTECTION
ACCESSORIES
-- VOLTMETRIC RELEASES
-- EARTH FAULT RELEASE
-- LOCKS & INTERLOCKS
-- MICRO SWITCHES

SHORT CIRCUIT MAKING CAPACITY DEPENDS ON

1

POWER FACTOR

2

INSTANT OF SWITCHING RATIO ( n )

SHORT CIRCUIT MAKING CAPACITY n =
SHORT CIRCUIT BREAKING CAPACITY

RATIO n BETWEEN SHORT C IRCUIT MAKING CAPACITY
AND SHORT CIRCUIT BREAKING CAPACITY
SHORT CIRCUIT
BREAKING
CAPACITY
( I in KA - rms )

POWER
FACTOR

MINIMUM
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