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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
Voltage Taps
On circuit breakers with Digitrip 1150 trip units potential taps
are required to monitor the three phase voltages. Voltage taps
may be placed on either the line (top) or load (bottom) terminals
of the breaker at the factory. Figure 37 illustrates line-side
voltage taps.
Secondary Contacts And Connection Diagrams
A maximum of sixty secondary wiring connection points are
available on the standard frame circuit breaker (48 on narrow
frame), each dedicated to a specific function (Figure 38). The
wiring points are finger safe with no more than two wires per
terminal.
Figure 37. Line-Side Voltage Tap for 1150 Trip Unit
Up to two secondary contact plug-in connectors (AMP), each
with 30 secondary points, are mounted on the top rear portion
of the circuit breaker . The plug-in connectors are protected
by a molded hood (Figure 39). How many connectors are
mounted depends upon a number of considerations, such as
whether the circuit breaker is electrically or manually operated
and how many features are required. When the front cover
of the circuit breaker is removed, the top of each plug-in
connector is exposed. A label on each connector identifies the
wiring points.
Protective Hood
Figure 39. Secondary Connector Protective Hood
Labels Legend
OTS Overcurrent Trip Switch
UVR Undervoltage Release
ATR Automatic Trip Relay (520M and
1150 Trip Units Only)
INCOM PowerNet
Communications Network
A BUS (Future Use)
A/S Auxiliary Contacts
NEUTRAL Neutral Sensor Input
GF SGND Source Ground Input
ZONE Zone Interlocking
ST Shunt Trip
SR Spring Release
MOTOR Charging Motor
LCS Latch Check Switch
Figure 38. Top View Secondary Connectors
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