SE and XE Series
ELECTROMECHANICAL SWITCHES
Operating Position (O.P.) – Position of
switch plunger or actuator at which point
contacts snap from normal to operated
position. Note that in the case of flexible
or adjustable actuators, the operating
position is measured from the end of the
lever or its maximum length. Location of
operating position measurement shown on
mounting dimension drawings.
Overtravel (O.T.) – Plunger or actuator
travel safely available beyond operating
position.
Definitions below explain the meaning of
operating characteristics. Characteristics
shown in tables were chosen as most
significant. They are taken at normal room
temperature and humidity. These may vary
as temperature and humidity conditions
differ. Sketches show how characteristics
are measured for in-line plunger actuation.
Pretravel (P.T.) – Distance or angle trav-
eled in moving plunger or actuator from
free position to operating position.
Release Force (R.F.) – Amount of force
still applied to switch plunger or actuator
at moment contacts snap from operated
position to unoperated position.
Operating Force (O.F.) – Amount of force
applied to switch plunger or actuator to
cause contact ‘‘snap-over.’’ Note in the
case of adjustable actuators, the force is
measured from the maximum length posi-
tion of the lever.
Linear dimensions for in-line actuation are
from top of plunger to a reference line,
usually the center of the mounting holes.
Total Travel (T.T.) – Distance from actuator
free position to overtravel limit position.
Differential Travel (D.T.) – Plunger or
actuator travel from point where contacts
‘‘snap-over’’ to point where they ‘‘snap-
back.’’
Free Position (F.P.) – Position of switch
plunger or actuator when no external force
is applied (other than gravity).
Full Overtravel Force – Force required to
attain full overtravel of actuator.
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