General
54 CSI Section 16470
Siemens Electrical Products and Systems
Specification Guide
480V Metal-Enclosed
Switchgear
4
The Siemens RL series circuit breakers
are designed for up to 600 volt service
with current carrying capacities of up to
5000 amperes and interrupting capacities
of up to 130,000 amperes unfused or
200,000 amperes fused.
These compact, fast operating circuit
breakers incorporate a stored energy
closing mechanism, either manually or
electrically charged, for fast, positive
closing.
A quick-make closing mechanism releas-
es the stored energy for high speed clos-
ing of the primary contacts. This positive,
controlled closing prevents unnecessary
arcing between the movable and station-
ary breaker contacts and thus lengthens
contact and breaker life.
Manual tripping is performed with the
push lever on the front of the breaker. Up
to three padlocks can be used to lock the
breaker contacts in the open position.
Typical Breaker Features
쐍 Arc Quenchers
쐍 Main and Arcing Contact Structures
쐍 Inductive Tripping Sensors
쐍 Control Wiring
쐍 Interlocks
쐍 Position Indicators
쐍 Interpole Barriers
쐍 Mechanical Trip Bar
쐍 Auxiliary Switches (option)
Each circuit breaker is a complete 3-pole,
single-throw element that is mechanically
and electrically trip-free, with a Static Trip
III overcurrent trip unit.
Tables 4.16 and 4.17 show circuit breaker
operating and control data.
Circuit Breaker Racking
Racking is accomplished by turning a
racking screw on the front of the breaker
and may be done with the compartment
door open or closed. The racking screw
turns U-shaped brackets on each side of
the breaker which rack the breaker frame
in or out of the compartment.
As the racking screw is turned counter-
clockwise, the breaker frame moves out
of the compartment and disconnects the
primary contacts, followed by the sec-
ondary contacts. With only the secondary
contacts connected (test position), the
breaker may be closed and opened for
testing without energizing the load. An
indicator located on the front of the
breaker identifies the position of the
breaker in the compartment.
Primary Disconnects
Primary current is applied to the circuit
breaker through silver plated disconnects.
The stationary contacts are mounted
through solid Pyro-Shield insulation
sheets in the back of the compartments.
The movable contacts are mounted on
the back of the breaker. Stainless steel
springs provide pressure to the finger
contacts in the connected position. Low
contact resistance is maintained by these
self-aligning contacts. The primary con-
tacts are positioned so that current can
flow only in the connected position. In
the test position the contacts are separat-
ed a safe distance.
Secondary Disconnects
Secondary circuits are connected to the
circuit breaker through silver-plated, slide-
type contacts which are located below
the arc quenching area to avoid contami-
nation from arc product gases. The posi-
tion of these contacts is visible with the
panel door open. The stationary contacts
are silver-plated copper strips mounted
on a Pyro-Shield molded base. The con-
tacts are recessed to guide the movable,
self-aligning contacts and to prevent acci-
dental short circuiting. Secondary connec-
tions are made automatically in both the
connected and test positions.
480V Metal-Enclosed Switchgear
LV Power Circuit Breakers
Type RL Circuit Breaker With Static Trip III Trip Unit And Optional Breaker Display Unit (BDU)
Secondary Disconnects in Cell
Left = Communications
Right = Breaker Control
Main and Arcing Contacts — Similar
Design for all Ratings
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