AIR CIRCUIT BREAKERS - Electrical and Electronics Division

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AC SWITCHES (SERIES S, SG & TP)
All switches are suitable for application in AC circuits. Most of the switches are rated for 690V AC and 6 and
10 Amps alone are rated for 400V AC. AC switches characterised by the “Quick Make-Slow Break”. These switches can be applied for
DC switching with derating and additional contacts in series according to the DC switching voltage.
AC/DC SWITCHES (SERIES D)
These switches have Quick Make-Break mechanism built in the latching design
ISOLATORS
These are basically ON-O�� switches, which can be used to isolate the power to a particular area of operation. These isolator
switches are available in a wide range from single pole to 12 pole design. Isolators with spring return are also available upto
4 poles. Preclose contacts are used for safety circuits and for neutral and earth line.
Isolators generally come under AC1/AC21 duty. Some times 3 pole ON-O�� switches are used to switch ON and O�� the motor, with
fuse protection, when they must be rated for AC3/AC23A duty.
CHANGEOVER SWITCHES
Changeover switches, also called as Double throw switches, they are used to operate two different circuits with different numbers of
inputs and output.
Changeover switches without jumper are used for connecting two different circuits, from two different sources (potential free contacts).
It may be due to two different operating voltages or any other incompatible lines.
All Double throw switch contacts by default are of Break Before Make type (BBM) to avoid overlapping of different circuits. Overlapping
changeover contacts can be offered against requirement.
MULTISTEP SWITCHES
These switches can also be called as Pole-Way switches, as they are generally described by Poles and Ways. Multi step switch does
the function of connecting different circuits in a common supply or vice-versa.
Multistep switches are basically two way switches available in 1 Pole, 2 Pole and 3 Pole versions.
GANG SWITCHES
These switches are called as Gang switches, as they increase the capacity of circuits by ganging. They are used for serialing and/or
paralleling to derive different circuit capacity. The power of battery supply can be increased by serialing. The power of resistor can
be increased by paralleling.
SELECTOR SWITCHES
With the help of these switches one can
— Measure currents in different circuits (with or without current transformer) with a single ammeter and a switch.
— Measure voltages between phases, and phase and neutral, with one switch.
— Measure voltages and currents of a circuit with one voltmeter, one single switch.
CONTROL SWITCHES
Control Switches are a unique alternative for many of the “PUSH BUTTON” stations, where it is preferred to control a system with one
switch instead of many push buttons. Many positions of the switch are possible to derive combinations. These control switches are
rated for AC15/DC13.
AC15 switches need to carry an inrush current of 10 times the normal operating current, while energising solenoids and coils. Hence
our switches are suitably derated for AC15, while specifying the normal operating current.
Control switches are used to energise contactors for controlling motor operations. Most of the switches are of spring return type to
enable latching the circuit with contactor NO contact to facilitate tripping by contactor tripping device.
MOTOR SWITCHES
These switches directly operate the motor with AC3 or AC4 duty.
They are mainly used for motor forward-reversing, star-delta, two speed forward reverse. Special switches designed to operate with
a contactor with built-in tripping feature on power failure and overload are available.
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APPLICATION