Accessories
Shunt Trip With Lockout
The shunt trip with lockout is similar to the regular shunt trip.
When energized. the shunt trip with lockout module sends a
signal to the trip unit to open the breaker. I n addition. when
continuously energized with the breaker open. a plunger in
the module acts upon the mechanism. blocking manual and
electric closing by preventing mechanism spring discharge.
To close the breaker, de-energize the module for 250 ms. Be
cause the breaker movable contacts o re restrained and can
not momentarily touch the stationary contacts. the mecha
nism remains "kiss-free". This feature is especially i mportant
in main-tie-main schemes or generator circuits.
Table
27. 1
Shunt Trip Module with Lockout
Catalog
Voltage
Maximum
Peak Inrush Nominal Input
Number
Rating
Operating
Current
Current
(50-60 Hz)
Voltage
lAC Amps)
lAC RMS mA)
(Volts)
SPSTL012
12 Vdc
14
19
300
SPSTL024
24 Vac/dc
26
1 5
300
SPSTL048
48Vac/dc
53
7.5
200
SPSTL120
120Vac/125
132
3
80
Vdc
SPSTL208
208Vac
228
1.9
60
SPSTL240
240 Vac/250
264
1. 5
45
Vdc
SPSTL480
480 Vac
528
3
65
SPSTL600
600Vac
660
3
65
Bell Alarm (Ala rm Only)
The bell alarm module is used to signal breaker "tripped" sta
tus to other accessories (e.g. externa l alarm devices. indicat
ing lights. relays, or logic circuits) for remote indication and
interlocking functions. The switch is configurable by means
of rear-mounted DIP switches on the MicroVersaTrip Plus™
and PM™ trip units. The bell alarm can be made to oper-
ate in response to an overcurrent ( including g round fault) or
protective relay trip and/or a shunt trip operation. and/or
operation of the undervoltage release module. It is not actu
ated as a result of normal breaker "ON/OFF' operation. For
the Power+™ trip unit, the bell alarm operates only when an
overcurrent (including ground fault) trip occurs.
This module provides a visual. mechanical pop-out target
which protrudes through the face of the circuit breaker door
when it operates. The bell alarm may be reset manually by
depressing the mechanical target, or automatically by clos
ing the breaker.
The bell alarm is provided with one SPOT switch with control
power duty contacts as shown in Table 27.2.
Bell alarm
Table
27.2
Bell Alarm Module
Catalog Number
AC
Ratings
DC
Ratings
SPBAA240
6 A @ 240 Vac
0.5 A @ 125 Vdc
0.25 A @ 250 Vdc
SPBAA600CD
6A @ 600 Vac
0.5 A @ 125 Vdc
0.25 A @ 250 Vdc
CD 600 Vac module not UL listed
27
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