48
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION
www.eaton.com
Instructional Leaflet
IB2C12063H03
Effective March 2012
Accessory Devices
A variety of accessory devices are available for use with
Magnum SB circuit breakers . Unless otherwise stated, they are
all considered optional devices in the sense that they are not
provided as standard on a manually operated circuit breaker .
Available accessories are identified here and discussed in
general terms . For more detailed information and/or installation
instructions, refer to individual instruction leaflets dedicated to
the accessories .
Magnum SB circuit breaker accessories are designed to fit all
frame sizes . The accessories fall into one of three categories:
• Plug-in electrical
• Internal electrical
• Mechanical
Plug-In Electrical Accessories
There are four Magnum SB Plug-In electrical accessories . Three
can be viewed for identification by name and rating through
viewing windows located in the right front of the circuit
breaker (
Figure 60
) . 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 circuit breakers (
Figures
61 and 62
) . It opens the circuit breaker instantaneously when
its coil is energized by a voltage input (
Table 7
) . A total of two
shunt trips can be mounted on a Magnum circuit breaker .
Table 7. Shunt Trip Ratings
Control
Voltages
Operational
Voltage Range
70-110%
Inrush Power
j
Consumption
Opening
Time (ms)
24 Vdc
17-26 Vdc
250 W
35
48 Vdc
34-53 Vdc
250 W
35
110-125 Vdc
77-138 Vdc
450 W
35
220-250 Vdc
154-275 Vdc
450 W
35
110-127 Vac
77-140 Vac
450 VA
35
208-240 Vac
146-264 Vac
450 VA
35
j
Required for less than 35 ms
Accessory Viewing Windows
Figure 60. Through-the-Window Electrical Accessories
Figure 61. Shunt Trip with Cutoff Switch
Figure 62. Shunt Trip Switch Installed