19
Interrupter/Operator Description
Figure 26:
MOC and TOC Switches Inside Switchgear.
Figure 27:
Circuit Breaker Limit Switches.
the auxiliary switch in both positions (
Figure 26
). Up to 24
stages may be provided.
TOC (Truck Operated Cell) Switch
Figure 26
shows the optional TOC cell switch. This switch
is operated by the circuit breaker as it is racked into the
Connect position.
Various combinations of ‘a’ and ‘b’ contacts may be option-
ally specified. These switches provide control and logic
indication that a circuit breaker in the cell has achieved the
Connect (ready to operate) position.
Limit Switches
Figure 27
– The motor cutoff switch (LS1) is used to sense
the position of the driven mechanisms. This switch de-
energizes the charging motor when the Charged position
of the closing springs is reached. When the closing springs
are discharged, this switch energizes the control circuit
powering the spring charging motor.
Spring charged switch (LS2) operates simultaneously with
motor switch (LS1). The spring charged switch allows the
close solenoid to be energized only when the springs are
charged, and also is part of the anti-pump circuitry.
The trip latch check switch (LS3) operates when the trip
latch linkage is in the reset position. It also is driven by
operating bars that sense when the breaker is in either the
Test or Connected position inside the switchgear. Control
circuitry prevents an electrical release of the closing