22 S&C Instruction Sheet 761-507
Installation
(c) Also, when the blade is in the fully Closed
position, each blade-closing cam must overlap
its respective interrupter closing lever to pre vent
inadvertent opening of the interrupter, and
clearance between the blade-closing cam and its
respective interrupter closing lever must be
within the limit shown.
(d) Move the blade in the opening direction and
verify each blade shunt contact rmly engages
its respective interrupter housing before the
blade contacts disengage from the stationary
main contact assemblies. See Figure 34. The
shunt contacts may be bent as required to
conform to these conditions.
(e) Also, as the blade assembly moves in the opening
direction, the two blade-opening cams must
simultaneously make positive engagement with
their respective interrupter opening levers, as
shown in Figure 35. Simultaneity is essential to
ensure both interrupters share the interrupting
duty. The opening lever on one or both
interrupters may be bent slightly to attain
opening simultaneity.
(f) After opening the blade fully, slowly close the
blade and verify the two opening cams do not hit
the interrupter opening levers. See Figure 35.
Figure 34. The blade assembly moving in the opening direction.
Figure 35. Verifying the blade-opening cams do not hit the
interrupter open ing levers on closing.
Interrupter opening lever
Blade-opening cam
Interrupter
opening
lever
Blade-
opening
cam
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