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Panasonic Corporation Electromechanical Control Business Division
industrial.panasonic.com/ac/e/
Technical Terminology & Cautions for Use (Detection Switches)
Panasonic Corporation 2021
AECTB36E 202110
TECHNICAL TERMINOLOGY
■ Definition of operating characteristic
The main terminological illustrations and
meanings which are used with snapaction
switches are as follows.
Center of mounting holes
FP
OF
RF
TT
MD
OT
TTP
OP
PT TF
RP
Classification Terminology Symbol Unit
Varying
display
method
Starting current
Force
Operating
Force
OF N Max.
The force required to cause contact
snap-action. It is expressed terms of force
applied to the the actuator.
Release
Force
RF N Min.
The force to be applied to the the actuator
at the moment contact snaps back from
operated position to total travel position.
Totaltravel
Force
TF N
Force applied to an actuator required to
move from an operating position to a total
travel position
Movement
Pretravel PT
mm,
degree
Max.
Distance or agree of the actuator movement
from free position to operating position.
Overtravel OT
mm,
degree
Min.
The distance or degree which the actuator
is permitted to travel after actuation without
any damage to the switching mechanism.
Movement
Differential
MD
mm,
degree
Max.
The distance or degree from operating
position to release position of the actuator.
Totaltravel TT
mm,
degree
The migration length or the move angle
from the free position to total travel position
of actuator
Position
Free Position FP
mm,
degree
Position of the actuator when no force is
applied to.
Operating
Position
OP
mm,
degree
±
The position of the actuator when the
traveling contacts snaps with the fixed
contact.
Release
Position
RP
mm,
degree
The position of the actuator when the
traveling contact snaps back from operating
position to its original position.
Total travel
Position
TTP
mm,
degree
The stopping position of the actuator after
total travel.
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