Burgess Switch Catalog Johnson Electric - Wagner GmbH

Terminology: Snap-action switches
Positions – forces – movements
Free position Position of the actuator, without any influence from an external force.
Operating position Position of the actuator when contact changeover takes place.
Total travel position Position of the actuator at the end of the allowed travel.
Release position Position of the actuator when the switch mechanism resets.
Actuating force The force required to move the actuator from the free position to the operating position.
Release force The value to which the applied force must be reduced to allow the mechanism to
reset after operation.
Force differential Difference between actuating force and release force.
Pre-travel Movement of the switch actuator between free and operating position.
Over-travel Movement of the switch actuator beyond the operating position.
Total travel The sum of pre-travel and over-travel.
Movement differential Distance between operating position and release position.
Release travel Movement of the switch actuator between release and total travel position.
Post release travel Movement of the switch actuator between release and free position.
Contact force – movement – diagram
Actuator or
auxiliary actuator
Guide
Pretravel
Free position Operating Position Final position Release Force
Operation of actuator or auxiliary actuator
Overtravel
Burgess switches burgess-switch@johnsonelectric.om www.burgess-switch.com 7
Movement
Differential
Release Travel
Post-release
Travel
Total Travel