Introduction
Shunt Trip (Extended Range):
A device designed to switch the Power Circuit
Breaker OFF remotely. When energized a Shunt
Release instantaneously activates the circuit
breaker mechanism ensuring a rapid
disconnection of the main contacts.
Two Shunt trips can be mounted in each Power
Circuit Breaker. The devices are available as
factory mounted components or as field
mountable devices. It is an easy-to-fit, clip-on unit,
with simple plug-in connectors to the Secondary
Disconnect Block.
Table 1. Catalog Numbers and Ratings
Catalog
No.
DC
Voltage
AC
Voltage
Rating*
GSTG024D
24V
Continuous
GSST024D
24V
Momentary
GSTG048
48V
48V
Continuous
GSTG072
70-72V
Continuous
GSTG120
110-125V 120-125V
Continuous
GSST120
110-130V 110-130V
Momentary
GSTG208A
208V
Continuous
GSTG240
220V
240V
Continuous
GSST240
220-240V 220-240V
Momentary
GSTG250D
250V
Continuous
* Momentary Rated shunt trip requires wiring one or more NO
(Normally Open) breaker aux contact(s) in series with the accessory to
avoid coil damage.
Use the following procedure to install the Shunt
Trip accessory into the circuit breaker.
1. Verify that the rating on the Shunt Trip
Mechanism identification plate matches the
voltage rating required for the application, as listed
in Table 1.
2. Turn the breaker off and discharge the closing
springs by depressing the OFF and ON buttons in
the sequence OFF-ON-OFF. Verify that the breaker
OFF-ON indicator shows OFF on a green
background and that the charge indicator shows
DISCHARGE on a white background. If installing in
a draw-out type breaker remove breaker from
adaptor (cassette) before continuing.
3. Loosen the 6 screws on front cover (fascia) using
a posidrive screw driver as shown in Fig 1.B
Rotate the charging handle down and slide the
front cover over the handle to remove the front
cover as shown in Fig. 1.C .
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