Internal Electrical Accessories - Eaton Magnum SB Series Technical Product Manual
Low voltage power circuit breaker
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Accessory devices and connections
Auxiliary switch
•
An auxiliary switch is an optional device providing remote
electrical indication if the circuit breaker is open or closed .
Up to three auxiliary switches can be mounted in one breaker .
Each switch has two normally open ("A") and two normally
closed ("B") contacts for a total of 12 available contacts .
Table 17 . Auxiliary switch, overcurrent trip switch, and
cell switch contact ratings
control voltages
contact rating inductive load (amperes)
250 Vac
10
125 Vdc
0.5
250 Vdc
0.25
8
1
1
1
1
1
1
Auxiliary switch (2A/2B)
1
1
Internal electrical accessories
1
Other electrical accessories are mounted inside the circuit
breaker . They can be factory or site installed . There are three
1
different internally mounted accessories:
1 . Overcurrent Trip Switch (Bell Alarm)
1
2 . Mechanical Trip Flag Pop-out Indicator
1
3 . Motor Operator
Overcurrent trip switch (bell alarm)
•
1
An overcurrent trip switch (bell alarm) is an optional device .
It provides an electrical indication when a circuit breaker trips
1
as a result of the trip unit reacting to an overcurrent condition .
Opening as a result of a circuit breaker's manual open button,
1
shunt trip, or undervoltage release does not cause the
overcurrent trip switch to operate .
1
The status of the contacts changes when the trip indicator
pops out . This permits the switch to be used as an alarm or
1
in conjunction with a spring release to block a subsequent
remote electrical closing signal . Refer to Section 3 for
available options .
1
Mechanical trip flag pop-out indicator
•
1
The mechanical trip flag pop-out indicator is an overcurrent
indication feature that can be supplied as an option on
1
Magnum breakers with integral trip units . This device is located
just above the trip unit on the breaker's front faceplate . In
the event the trip unit trips the breaker on an overcurrent
condition, the red trip flag releases and pops out to give local
visual indication . This trip indication is in addition to any LED
trip indication next to the protection feature .
54
MaGnuM PRoDuct GuiDe CA013002EN—April 2017
Courtesy of NationalSwitchgear.com
The red flag can be reset by manually pushing it back in .
The breaker can be reclosed, even if the flag is not reset . An
optional Overcurrent Trip Switch (OTS) is available should an
electrical lockout be required on an overcurrent trip condition .
If the trip unit trips the breaker on an overcurrent condition:
Red mechanical trip flag indicator pops out
•
OTS contacts change state
•
The OTS Switch is reset by manually pushing in the red trip
flag . When the trip flag is reset, the OTS switch contacts
return to their normal state .
Mechanical trip
indicator
Mechanical trip indicator with associated overcurrent trip switch
Motor operator
•
A motor operator is an electric motor assembly internally
mounted in the circuit breaker . It charges the closing springs
electrically for remote or local operation . It can be factory or
site installed . A UL Listed motor operator kit is available to
make the conversion from a manually operated breaker to an
electrically operated breaker .
Table 18 . Motor operator ratings
operational
voltage
Running
control
range
current
voltages
85–110%
(a. avg.)
1
24 Vdc
20–26
12
48 Vdc
41–53
5
60 Vdc
51–66
3
110–125 Vdc
94–138
2
220–250 Vdc 187–225
1
110–127 Vac
94–140
2
208–277 Vac 177–305
1
AC voltages are 50/60 Hz .
1
www.eaton.com
Power
Maximum
typical
consump-
charging
inrush
tion (W or
time
current
Va)
(seconds)
300% of
300
5
running
500% of
250
5
running
600% of
250
5
running
600% of
250
5
running
600% of
250
5
running
600% of
250
5
running
600% of
250
5
running
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