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3-8 ACCESSORY DEVICES
A variety of accessory devices are available for use with
Magnum circuit breakers. Unless otherwise stated, they
are all considered optional devices in the sense that
they are not provided as standard on a manually operat-
ed circuit breaker. Available accessories are identified
here and discussed in general terms. For more detailed
information and/or installation instructions, refer to indi-
vidual instruction leaflets dedicated to the accessories.
Magnum circuit breaker accessories are designed to fit
all frame sizes. The accessories fall into one of three
categories:
• Plug-in electrical
• Internal electrical
• Mechanical
3-8.1 PLUG-IN ELECTRICAL ACCESSORIES
There are four Magnum Plug-In electrical accessories.
Three can be viewed for identification by name and rat-
ing through viewing windows located in the right front of
the circuit breaker (Figure 3-47). All four are plug-in type
and can be factory installed or field installed using a UL
listed kit.
The four Plug-In accessories are:
• Shunt Trip (ST)
• Spring Release (SR)
• Undervoltage Release (UVR)
• Auxiliary Switch
Shunt Trip - The shunt trip is an optional device on cir-
cuit breakers (Figures 3-48 and 3-49). It opens the cir-
cuit breaker instantaneously when its coil is energized
by a voltage input (Table 3.3). A total of two shunt trips
can be mounted on a Magnum circuit breaker.
Table 3.3 Shunt Trip Ratings
Operational
Control
Voltage Range
Voltages
70-110%
24 Vdc
17-26 Vdc
48 Vdc
34-53 Vdc
110-125 Vdc
77-138 Vdc
220-250 Vdc
154-275 Vdc
110-127 Vac
77-140 Vac
208-240 Vac
146-264 Vac
①
Required for less than 35 ms
I.B. 2C12060H08
①
Opening
Inrush Power
Time
Consumption
(ms)
250 W
35
250 W
35
450 W
35
450 W
35
450 VA
35
450 VA
35
For more information visit: www.EatonElectrical.com
Effective: May 2006
Accessory Viewing Windows
Figure 3-47 Through-the-Window Electrical Accessories
Figure 3-48 Shunt Trip with Cutoff Switch
Figure 3-49 Shunt Trip Switch Installed
Instruction Book
Page 46
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