Siemens Switch 480V User Manual
480V Metal-Enclosed Switchgear
Siemens low-voltage metal-enclosed
switchgear is used in electric power distribution systems for the control and protection of circuits and equipment. The
switchgear employs drawout type low
voltage power circuit breakers described
in Section 4.
LV switchgear is typically installed in:
쐍 Industrial Plants — for power and
lighting networks and feeders, power
generation and other auxiliaries, and to
provide power for machine tools and
material handling equipment drivers.
쐍 Utility and Co-generation Facilities
— for motor control centers to protect
and distribute power to electrical
devices such as blowers, compressors, fans, pumps, and motors.
쐍 Commercial and Residential
Buildings — for protection and distri-
bution of power for lighting, elevators,
air conditioning, blowers, fans,
motors, and pumps.
General
Available Types:
쐍 Type R — indoor (NEMA 1)
쐍 Type SR — outdoor walk-in (NEMA
3R)
Low-voltage switchgear can be applied
on distribution systems with:
쐍 3-phase, 3- or 4-wire feeders
쐍 50 or 60Hz
쐍 Voltages of 208, 240,480, or 600 volts
쐍 Currents up to 5000 amperes
Circuit breakers may be either manually
or electrically operated, fused or unfused.
The following designations are used:
쐍 RL — Standard Interrupting
4
쐍 RLE — Extended Interrupting
쐍 RLI — High Interrupting
쐍 RLF — Fused Type
Siemens Static Trip III trip units are provided on all low voltage power circuit
breakers, except non-automatic circuit
breakers. All circuit breakers are UL
480V Metal-Enclosed
Switchgear
Listed. See Tables 4.10 and 4.11 for circuit breaker ratings.
480 Volt Metal-Enclosed Switchgear
Industry Standards
Types R and SR switchgear with power
circuit breakers are designed, tested and
constructed in accordance with:
쐍 ANSI C37.20.1 — Metal-Enclosed
Low Voltage Power Circuit Breaker
Switchgear
쐍 ANSI C37.50 — Test Procedure for
Low Voltage AC Power Circuit
Breakers Used in Enclosures
쐍 ANSI C37.51 — Conformance Testing
of Metal-Enclosed Low Voltage AC
Power Circuit Breaker Switchgear
Assemblies
쐍 Applicable standards of IEEE and
NEMA
쐍 Applicable requirements of the
National Electric Code (NEC)
쐍 UL 1558 — Metal-Enclosed Low
Voltage Power Circuit Breaker
Switchgear
Type RL drawout circuit breakers are in
accordance with:
쐍 ANSI C37.13 — Low Voltage AC
Power Circuit Breakers Used in
Enclosures
쐍 ANSI C37.16 — Preferred Ratings,
Related Requirements, and
Application for Low Voltage Power
Circuit Breakers and ACPower Circuit
Protectors.
쐍 ANSI C37.17 — Trip Devices for AC
and General Purpose DC Low- Voltage
Power Circuit Breakers.
쐍 UL 1066 — Low Voltage AC and DC
Power Circuit Breakers Used in
Enclosures.
Features and modifications required by
NEC are incorporated when the assembly
is designated as “Service (Entrance)
Equipment.”
UL Listing (Optional)
An Underwriters’ Laboratories listing
mark (UL label) can be optionally supplied
for each vertical section. The specific
section must contain only devices which
are UL Listed or are UL recognized components found suitable for the intended
use. All circuit breaker drawout elements
are UL Listed.
50 CSI Section 16470
Siemens Electrical Products and Systems
Specification Guide
480V Metal-Enclosed Switchgear
Siemens low-voltage metal-enclosed
switchgear is used in electric power distribution systems for the control and protection of circuits and equipment. The
switchgear employs drawout type low
voltage power circuit breakers described
in Section 4.
LV switchgear is typically installed in:
쐍 Industrial Plants — for power and
lighting networks and feeders, power
generation and other auxiliaries, and to
provide power for machine tools and
material handling equipment drivers.
쐍 Utility and Co-generation Facilities
— for motor control centers to protect
and distribute power to electrical
devices such as blowers, compressors, fans, pumps, and motors.
쐍 Commercial and Residential
Buildings — for protection and distri-
bution of power for lighting, elevators,
air conditioning, blowers, fans,
motors, and pumps.
General
Available Types:
쐍 Type R — indoor (NEMA 1)
쐍 Type SR — outdoor walk-in (NEMA
3R)
Low-voltage switchgear can be applied
on distribution systems with:
쐍 3-phase, 3- or 4-wire feeders
쐍 50 or 60Hz
쐍 Voltages of 208, 240,480, or 600 volts
쐍 Currents up to 5000 amperes
Circuit breakers may be either manually
or electrically operated, fused or unfused.
The following designations are used:
쐍 RL — Standard Interrupting
4
쐍 RLE — Extended Interrupting
쐍 RLI — High Interrupting
쐍 RLF — Fused Type
Siemens Static Trip III trip units are provided on all low voltage power circuit
breakers, except non-automatic circuit
breakers. All circuit breakers are UL
480V Metal-Enclosed
Switchgear
Listed. See Tables 4.10 and 4.11 for circuit breaker ratings.
480 Volt Metal-Enclosed Switchgear
Industry Standards
Types R and SR switchgear with power
circuit breakers are designed, tested and
constructed in accordance with:
쐍 ANSI C37.20.1 — Metal-Enclosed
Low Voltage Power Circuit Breaker
Switchgear
쐍 ANSI C37.50 — Test Procedure for
Low Voltage AC Power Circuit
Breakers Used in Enclosures
쐍 ANSI C37.51 — Conformance Testing
of Metal-Enclosed Low Voltage AC
Power Circuit Breaker Switchgear
Assemblies
쐍 Applicable standards of IEEE and
NEMA
쐍 Applicable requirements of the
National Electric Code (NEC)
쐍 UL 1558 — Metal-Enclosed Low
Voltage Power Circuit Breaker
Switchgear
Type RL drawout circuit breakers are in
accordance with:
쐍 ANSI C37.13 — Low Voltage AC
Power Circuit Breakers Used in
Enclosures
쐍 ANSI C37.16 — Preferred Ratings,
Related Requirements, and
Application for Low Voltage Power
Circuit Breakers and ACPower Circuit
Protectors.
쐍 ANSI C37.17 — Trip Devices for AC
and General Purpose DC Low- Voltage
Power Circuit Breakers.
쐍 UL 1066 — Low Voltage AC and DC
Power Circuit Breakers Used in
Enclosures.
Features and modifications required by
NEC are incorporated when the assembly
is designated as “Service (Entrance)
Equipment.”
UL Listing (Optional)
An Underwriters’ Laboratories listing
mark (UL label) can be optionally supplied
for each vertical section. The specific
section must contain only devices which
are UL Listed or are UL recognized components found suitable for the intended
use. All circuit breaker drawout elements
are UL Listed.
50 CSI Section 16470
Siemens Electrical Products and Systems
Specification Guide
480V Metal-Enclosed Switchgear
Construction Details
General
General
The Siemens 480 volt switchgear assembly consists of one or more metalenclosed, vertical sections. Normally the
end sections are designed to allow for
installation of future sections.
Each vertical section consists of up to
four individually enclosed breaker or auxiliary compartments which are sized to
provide uniform height.
Included in each assembly are various
components such as circuit breakers,
instrumentation and control equipment,
transformers, relays, three-phase bus
work, and all internal wiring, connectors,
and other supporting equipment.
In accordance with ANSI C37.20.1, the
maximum temperature for parts that are
handled is 50°C. The main bus maximum
temperature rise is 65°C above 40°C
ambient. The temperature rise of the air
surrounding the cable connection points
is limited to 45°C above 40°C ambient.
Finish
During construction, the structural steel
parts, panels, and compartments are all
prepared for painting by a five-stage
wash system. Standard finish color is
light gray ANSI 61. If a different finish
color is required, it is applied over the
standard finish with conventional spray
equipment and is allowed to air cure. The
completed finish has a nominal 2 mils dry
film thickness.
Assembly Construction
Siemens metal-enclosed power
switchgear is constructed of preformed,
full-depth, 14-gauge steel sheets bolted
together and reinforced with cross-member braces to form a rigid, self-supporting
compact assembly. The top and rear
plates, and side sheets are all 14-gauge
steel. When two vertical sections are
mounted together, two sheets of 14gauge steel separate adjacent circuit
breaker compartments.
햴
햳
Bolted steel / glass polyester compartments housing each power circuit breaker are mounted in the vertical section to
form the switchgear assembly. This isolates the circuit breakers from the bus /
cable section and from adjacent circuit
breaker compartments.
The bus / cable section includes main
horizontal bus, riser bus, connections
from the main bus to each set of primary
disconnects, and load side copper runback bus.
Grounded metal barriers can be provided
to isolate the main bus from cable connections. Barriers are also available to
isolate the incoming line to the main circuit breakers from the main load bus of
the switchgear.
햵
햲 Inter-Unit Wiring Trough
햳 Meter and Auxiliary Compartment
햴 Ventilation and Lifting Structure
햵 Telescoping Breaker Drawout Rails
햶 Ventilation Openings (RL-2000, RL-3200, RL-4000
and RL-5000)
햲
햶
4
480V Metal-Enclosed
Switchgear
Siemens Electrical Products and Systems
Specification Guide
51CSI Section 16470
480V Metal-Enclosed Switchgear
Construction Details
General
Main and Ground Bus
The standard main bus is silver-plated
copper. Welded aluminum is also available. Provisions for future extension of
aluminum main bus conductors include
tin plated joints with high tensile strength
steel hardware. Tin-plated copper bus is
optionally available.
The main three-phase horizontal bus is
arranged vertically one phase above the
other with edge-to-edge alignment to
provide high, short circuit strength.
Insulated main and vertical bus are
optional.
Main bus ratings available are 1600,
2000, 3200, 4000, or 5000 amperes continuous current. A neutral bus is furnished when specified, and can be rated
1600, 2000, 3200, 4000 or 5000 amperes
continuous current.
A standard copper ground bus extends
through all sections. A cable lug can be
mounted to the ground bus in each
section.
Minimum bus bracing is 65,000 amperes
RMS symmetrical. Higher symmetrical
bracings are available based on the lowest breaker short circuit rating in the
group.
Load side runbacks for feeder circuits are
one-piece copper construction, are insulated with sleeve tubing in the main bus
area, and are supported by high-strength,
glass polyester moldings.
Control Wiring
Standard secondary and control wiring is
#14 AWG extra-flexible, stranded copper
type SIS. Terminations are made with
compression-type, insulated terminals.
For devices not having screw-type terminals, tab-type disconnects are used.
Insulation
The insulation used is Pyro-Shield, a fiberglass-reinforced polyester material that
has high impact strength and low moisture absorption. Other features include
high flame retardance, high resistance to
chemical fumes, and long life at high
temperatures.
Circuit Breaker Compartments
Typical circuit breaker compartments
include primary disconnects, ground disconnect, drawout rails, and associated
interlocks, and secondary disconnects, if
appropriate. Telescoping drawout rails
allow the breaker to be withdrawn from
the compartment without additional
extensions or adapters. Compartments
for electrically-operated circuit breakers
include secondary disconnects and control circuit fuses. Up to three current
transformers for metering or relaying can
be mounted in each compartment.
Circuit breaker compartment front panels
can be used to hold a variety of auxiliary
devices such as breaker control switches, ammeters, and test blocks.
4
480V Metal-Enclosed
Switchgear
52 CSI Section 16470
햲 Control Circuit Fuses
햳 Ground Disconnect
햴 Secondary Disconnect
햵 Front Panel Devices
햶 Primary Disconnect
Circuit Breaker Cell Interior
Siemens Electrical Products and Systems
Specification Guide
햷 TOC Switch Operator
햸 Interference Interlock
햹 MOC Switch Operator
햺 Space Heater
햻 Drawout Rails
480V Metal-Enclosed Switchgear
Guide Form Specifications
Options
Switchgear Mounted Hoist
The hoist, optional on type R indoor
switchgear, and standard on type SR
outdoor switchgear, travels along rails on
top of the switchgear to ease breaker
handling.
TOC and MOC Switches
The Truck Operated Cell (TOC) Switch
provides interlocking control or remote
indication of the breaker racking position.
The cubicle mounted auxiliary switch or
Mechanism Operated Cell (MOC) switch
provides interlocking control or remote
indication based on the main contact
position (open or closed).
The switches have field adjustable contacts for simple conversion of contacts
from normally open (“a” type) to normally closed (“b” type). Each contact may be
adjusted individually without disassembly
or removal of wiring.
Typical Outdoor Installation with Liquid Filled Transformer
General
MOC and TOC Switches. TOC Shown
with Cover Removed.
Shutters
These provide protection against accidental contact with primary disconnects in a
compartment when the breaker is
removed.
Wire Trough Covers
Secondary wiring is enclosed within each
vertical section in the primary bus and
outgoing cable areas.
Key Interlock
This provides a mechanical means for
operating circuit breakers and other
devices only when predescribed conditions are met.
PTS4 Test Set
Set allows testing of the full range of protective settings of Static Trip III trip units.
Metering and Auxiliary Compartments
Compartments are available to house
devices such as voltage transformers,
metering, control power transformers,
and supervisory devices.
Instrument and Control Transformers
Voltage transformers and control power
transformers are mounted in auxiliary
compartments. These transformers are
protected by primary pull-out type current-limiting fuses and secondary fuses.
Current transformers are normally mounted on the compartment primary disconnect studs where they are readily accessible. See Tables 4.10, 4.11, 4.12, and
4.13 for available ratings.
Outdoor Switchgear
Type SR outdoor switchgear, available up
to 4000 amp, is enclosed in a weather
resistant (NEMA 3R) steel housing. All
exterior doors extend below the floor line
and are gasket sealed.
For protection from snow, rain, and dust,
the switchgear rests on a six-inch,
formed steel base which provides rigid
support and a tight bottom seal. A heavy
duty, coal tar emulsion protective undercoating is applied to the underside for
protection against moisture and corrosion. Shielded ventilation housings permit
proper air circulation while excluding
dust, dirt, and foreign matter.
A lighted, unobstructed service aisle is
provided at the front of the switchgear
allowing inspection and maintenance
without exposure to the elements, An
access door equipped with an emergency bar release is located at each end
of the aisle. A GFI convenience outlet is
included.
Accessories
Each switchgear assembly includes the
following standard accessories:
쐍 Crank for circuit breaker racking
쐍 Lifting bar assembly for all circuit
breaker types
쐍 Spring charging handle for electrically
operated circuit breakers
As an optional accessory, a test cabinet
is available for indoor use that is wall
mounted with necessary equipment for
testing electrically-operated breakers that
have been removed from the breaker
compartments.
Portable PTS4 Test Set
4
480V Metal-Enclosed
Switchgear
Siemens Electrical Products and Systems
Specification Guide
53CSI Section 16470
480V Metal-Enclosed Switchgear
LV Power Circuit Breakers
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 releases the stored energy for high speed closing of the primary contacts. This positive,
controlled closing prevents unnecessary
arcing between the movable and stationary 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
4
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
480V Metal-Enclosed
Switchgear
the breaker which rack the breaker frame
in or out of the compartment.
As the racking screw is turned counterclockwise, the breaker frame moves out
of the compartment and disconnects the
primary contacts, followed by the secondary 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.
Type RL Circuit Breaker With Static Trip III Trip Unit And Optional Breaker Display Unit (BDU)
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 contacts are positioned so that current can
flow only in the connected position. In
the test position the contacts are separated a safe distance.
Secondary Disconnects
Secondary circuits are connected to the
circuit breaker through silver-plated, slidetype contacts which are located below
the arc quenching area to avoid contamination from arc product gases. The position 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 contacts are recessed to guide the movable,
self-aligning contacts and to prevent accidental short circuiting. Secondary connections are made automatically in both the
connected and test positions.
General
Secondary Disconnects in Cell
Left = Communications
Right = Breaker Control
Main and Arcing Contacts — Similar
Design for all Ratings
54 CSI Section 16470
Siemens Electrical Products and Systems
Specification Guide
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