48
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION www.eaton.com
Instructional Leaet 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
To Next Page
Loading...
Need help?
General
