Contact Mechanism Features :

Compact size, Quick make & Quick Break mechanism
High electrical & mechanical endurance.
Enclosed housing to avoid dust ingress.
Double break contacts per pole.
Load and Line reversibility.
Provision of Phase seperators, add-on auxiliary switch
Door interlock and padlock facility, telescopic operating shaft.
Extended outgoing terminals.


The contact mechanism is knife blade type with self cleaning action during operation. The fixed contact terminals in each phase have separate main and arcing contacts. The moving contact assembly has four sets of contacts on moving carrier and the entire assembly rests on three guides on moving carrier itself, which assists in its true movement during making and breaking.

The moving contact mates with the fixed contact by slide movement of the moving contact assembly. The contact is first made with the arcing contact and thereafter with the main contact. During breaking, the arc formation is across the arcing contacts thereby protecting the main contacts which results into enhanced life of the switch. The arc is effectively quenched & confined in arc barrier in each phase

The switches can be mounted inside a panel either in horizontal or vertical mode without any effect on the performance.

Operating Mechanism

The operating mechanism consists of single side fron operated handle which drives the spring assisted toggle mechanism, inturn operating the switch. Position indication provided on front of switch, i.e. on the operating shaft.

In position 'I', supply I (Main) is connected to the load, supply II is off.
In position 'O', supply I & II are both disconnected from the load
In position 'II', supply II (Standby) is connected to the load, supply I is off.
Hence in none of the cases, supply I & II are connected simultaneously.