AIR CIRCUIT BREAKERS - Electrical and Electronics Division

NEW
PROTECTION DEVICES
miniature circuit breakers (MCBs)
Provides protection & control of circuits against overloads & short-circuits in domestic, commercial &
industrial electrical distribution systems
Available in 1-4 pole, 0.5 to 100A with type B, C or D tripping characteristics
MCB Type NB---A NC---N ML---A ND---A NM---
Range 6-63A 0.5-63A 6-40A 0.5-63 80/100
Poles 1-4 1-4 SP&N 1-4 1-4
Breaking Capacity
IEC 898-1995 10kA 10kA 6kA 10kA –
IEC 947-2 15kA 15kA 7.5kA 15kA 10kA
Rated voltage 230/415V 230/415V 230V 230/415 230/415
Electrical endurance
0.5 to 32A 20,000 20,000 10,000 20,000 –
40 to 63A 10,000 10,000 10,000 10,000 –
80 to 100A – – – – 20,000
Touch proof terminals i.e. protection against direct contact
Bi-connect facility i.e cable and busbar can be terminated separately allowing safe & fast connection
Conform to the latest version of the international standards IEC 898-1995 / IEC 947-2 / IS 8828-1996
Low let-through energy (class 3) saves power and reduces heat build-up
Two position din rail clips allows fast installation
Windows at the sides of MCB enable auxiliaries and earth leakage add-on blocks to be fitted providing
additional protection and control
Suitable for DC applications – 1 pole up to 60V, 2 poles in series upto 125V
“NC” MCBs calibrated at 40 o C
MCB auxiliaries & accessories
Auxiliaries snap fit to the side of MCBs and providing additional protection or control
Auxiliary contact (1NO + 1NC) – allows remote indication of the device contacts, to which it is associated
Trip Alarm contact – provides indication if the MCB trips due to fault. MCB cannot be switched on without
resetting
Shunt release – allows remote tripping of the device. Available in voltage ratings 230V AC & 9-48V DC
Under-voltage release – allows MCB to trip when the voltage falls by 35% & allows MCB to be closed only
when the Voltage is above 70% of the nominal voltage. AC & DC versions available
Locking kit – allows locking of the device
Flush mounting kits available
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