Siemens 480V User Manual

Siemens low-voltage metal-enclosed
switchgear is used in electric power dis-
tribution systems for the control and pro-
tection 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, compres-
sors, 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. 

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
쐍 RLE — Extended Interrupting
쐍 RLI — High Interrupting
쐍 RLF — Fused Type
Siemens Static Trip III trip units are pro-
vided on all low voltage power circuit
breakers, except non-automatic circuit
breakers. All circuit breakers are UL
Listed. See Tables 4.10 and 4.11 for cir-
cuit breaker ratings.

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 com-
ponents found suitable for the intended
use. All circuit breaker drawout elements
are UL Listed.

General

50

CSI Section 16470

Siemens Electrical Products and Systems

Specification Guide

480 Volt Metal-Enclosed Switchgear