An operating or trip point is where the contacts change state from their normal, unoperated position.
A release or reset point is where the switch contacts return to their normal position.
Differential travel refers to the distance between the operating and release point.
The purpose of separating the operating and release points is to protect the contacts from rapid, undesirable ON/OFF due to vibrations that will shorten the operating life of your switch.
Over-travel is a built-in safety feature that prevents damage to the switch by allowing the actuator to travel beyond its operating point.
To help minimize mechanical stress and damage, you should make sure the actuator does not go beyond the allowed over-travel distance.
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