subject: Air Circuit Breaker [print this page] Technical Overview: Technical Overview:
n400~1600A in single frame size
nLight & compact
nHigh breaking capacity - 45/50kA
nReliable system protection thru:
a)Thermal Magnetic (TOMCR)
b)Microprocessor Release(IT-100)
nFast acting mechanism (total breaking time less than 30ms including arcing time of less than 10ms) minimizes installation stress under fault condition
nEasy termination - horizontal Bus bar connection.
nHigh mechanical & electrical life.
nHigh dielectric strength due to use of class 'B' and 'F' insulating material ensures reliable performance in tropical conditions
nComply with utilization category B & pollution degree 3 group 1 of IEC60947-Part1
nTested for seismic conditions .
nWide range of accessories offered-Shunt trip, UVT, Auxiliary Switch, Trip indication switches to meet market specifications.
Full utilization of electromagnetic repulsive force
Even though it is sound and compact in design, it provides high breaking capacity and short - time withstand current capacity by fully utilizing electromagnetic repulsive force.
The contact spring normally provides an adequate contact pressure.
A large current flow causes an electromagnetic repulsive force between the contact lead halves.
nThis repulsive force works in a direction to turn the moving contact clockwise about the contact shaft, giving it more contact pressure.
nHence this unique design ensures a high short-time withstand current capacity.
nWhen interrupting a large current, the electromagnetic repulsive force works in a direction to separate the moving contact from the stationary contact.
nA separating force resulting from the electromagnetic repulsive force adds to that by the trip spring, assisting a high-speed interruption. This is why our design provides a high breaking capacity
Microprocessor Release
IT-100 is a true RMS sensing overcurrent trip device, requires no external supply for its basic function
Salient Features
Error free and user friendly setting of current/time.
Provides highest degree of system protection coordination.
Self powered by built in current transformer.
No mal-operation due to external disturbances.
Built in operation check function.
Visual fault discrimination by LEDs.
Three phase and earth fault in one single compact unit.
Self monitoring of trip unit with blinking indication.
