US10D10A00 Datasheet, PDF (4/94 Pages) Honeywell Solid State Electronics Center – Basic Switches

Basic Switches
Operating Characteristics
ELECTROMECHANICAL SWITCHES
Definitions below explain the meaning of
operating characteristics. Characteristics
shown in tables throughout catalog were
chosen as most significant. They are tak-
en at normal room temperature and hu-
midity. These may vary as temperature
and humidity conditions differ. Sketches
show how characteristics are measured
for in-line plunger actuation.
Linear dimensions for in-line actuation
are from top of plunger to a reference line,
usually the center of the mounting holes.
Differential Travel (D.T.)—Plunger or ac-
tuator 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.
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 posi-
tion is measured from the end of the lever
or its maximum length. Location of oper-
ating position measurement shown on
mounting dimension drawings.
Operating Force (O.F.)—Amount of
force applied to switch plunger or actua-
tor to cause contact ‘‘snap-over.’’ Note in
the case of adjustable actuators, the force
is measured from the maximum length
position of the lever.
Overtravel (O.T.)—Plunger or actuator
travel safely available beyond operating
position.
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.
IN-LINE PLUNGER ACTUATION
Total Travel (T.T.)—Distance from actua-
tor free position to overtravel limit posi-
tion.
94 Honeywell Sensing and Control
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