Switch Characteristics

-Contact forms -Terminal codes
Diagram Circuitry Name Code Terminal
S.P.D.T.
(Single-Pole-Double-Throw)
COM Common Terminal
S.P.S.T.-N.O.
(Single-Pole-Single-Throw)
(Normal-Open)
NC Normal-Close Termianl
S.P.S.T.-N.C.
(Single-Pole-Single-Throw)
(Normal-Close)
NO Normal-Open Terminal
S.P.S.T.-N.O.-DM
(Single-Pole-Single-Throw)
(Normal-Open, Double-Make)
   
S.P.S.T.-N.O.-DMx2
(Single-Pole-Single-Throw)
(Normal-Open, Double-Make x2)
   

- Definition of Operating Characteristics
Classification
Term
Abbreviation
Unit
Definition
Force Operating Force OF cN Amount of force applied to switch actuator to cause snap action contact from Free Position to Operating Position.
Release Force RF cN Amount of force applied to switch actuator in order to move from Total Travel Position to Release Position.
Total Travel Force TTF cN Amount of force applied to actuator in order to move from Operating Position to Total Travel Position.
Movement Pre-Travel PT mm, angle Distance or angle which actuator travels from Free Position to Operating Position.
Over-Travel OT mm, angle Distance or angle which actuator travels from Operating Position to Total Travel Position.
Movement-Differential MD mm, angle Distance or angle which actuator travels from Operating Position to Release Position.
Total Travel TT mm, angle Distance or angle from actuator Free Positon to Total Travel Position.
Position Free Position FP mm, angle Position of actuator when no external force is applied.
Operating Position OP mm, angle Position of actuator at where contacts snap from Free Position to Operating Position.
Release Position RP mm, angle Position of actuator at where contacts snaps back from Operating Position to Free Position.
Total Travel Positioin TTP mm, angle Position at where actuator reaches Over-Travel limit.