480V Metal-Enclosed Switchgear
LV Power Circuit Breakers
General
58 CSI Section 16470
Siemens Electrical Products and Systems
Specification Guide
480V Metal-Enclosed
Switchgear
4
RL Breaker Accessories /
Modifications (cont’d)
Operation Counter
A mechanically-operated, 5-digit non-
resetable counter can be mounted
beneath the breaker auxiliary switch.
The counter is incremented by the
action of the auxiliary switch operating
mechanism.
Undervoltage Trip Device
The undervoltage trip device protects
against a drop in normal bus voltage and
functions to directly trip the breaker.
Pickup occurs at 85 percent or less of
rated value and dropout between 30 and
60 percent of rated value. Pickup and
dropout are individually adjustable.
Instantaneous or time-delayed operation
can be provided. The static timing unit is
adjustable from 0.04 to 4 seconds for
time delay. This allows the system to
distinguish between undervoltage
conditions and momentary voltage dips.
Electrically Operated Interlock
This can be added to interlock two break-
ers, preventing both from being closed at
the same time. These electromechanical
devices add an additional solenoid that
must be energized before the breaker
can be closed. When the interlock is de-
energized, the breaker is held trip-free
and cannot be closed electrically or
manually. The interlock has a mechanical
link that goes to the main shaft of the
breaker. The interlock is held in the
picked-up position when the breaker is
closed. Once closed the interlock can be
de-energized without tripping the breaker.
There are no adjustments for pickup or
dropout voltages. The interlocks are
continuously energized.
Automatic Trip Alarm Contact (with or
without Lockout) (Bell Alarm)
The bell alarm contact is operated when
the trip actuator operates in response to
the Static Trip III trip unit. It indicates
when the circuit breaker has tripped as a
result of the static trip unit. The contact
can control a local or remote auxiliary
alarm for indication of an automatic trip
or, by wiring in series with a breaker clos-
ing coil, for interlocking to prevent circuit
breaker closure until the circuit is reset.
The contact must be reset manually or
electrically (optional). The manually reset
switch is available with a single-pole
double-throw contact, or two single-pole
single-throw contacts. The electrically
reset switch is available with a single-
pole single-throw contact.
If desired, a mechanical lockout option
may be provided. This substitutes a
manual reset for the automatically reset
tripping actuator. In this case the breaker
is held trip free until the lockout is
manually reset.
480V Metal-Enclosed Switchgear
LV Power Circuit Breakers
Dropout
Voltage
Pickup
Voltage
Nominal Control
Voltage
60 Hz AC
100120
240 or
480
햲
60
——
DC
40 24
105
48
125 62
Table 4.7 Undervoltage Trip
Ratings
햲
Not available. Use 120 VAC undervoltage device with
appropriate 240/120V or voltage transformer in cubicle.
BreakMakeContinuous
Bell Alarm Contact Ratings
(Amperes)
Nominal
Control
Voltage
60 Hz
AC
10.0 10.0
10.0
10.0
10.0
10.0
10.0
120
240
DC
0.5
0.5
48
125
0.25
10.0
10.0
0.5
0.5
0.25250
Table 4.9
Ratings
Bell Alarm Contact
RL Circuit Breaker – Rear View
Current Sensors
PT Module (Optional)
Ground Shoe Contact
Primary Disconnects
Secondary Disconnects
Dropout
Voltage
Pickup
Voltage
Voltage Range
Nominal Control
Voltage
60 Hz AC
104
208
120
240
36
72
DC
38 15
100
48
125 38
200250 75
Table 4.8 Interlock Coil Ratings
England 
Deutschland 
France 
Italia 
Polska 
United Kingdom 
Россия 
Nederland 
España 
Magyarország 
Sverige 
România 
Portugal 
Colombia 
Suomi 
New Zealand 
Česká republika 
Türkiye 
Danmark 
日本