Specification

Siemens Industry, Inc. SPEEDFAX™ 2017 Product Catalog
3-39
3
MURRAY
Safety Switches
General Duty Switches; Prefix “G”
General duty switches are available in indoor
TYPE 1 and outdoor TYPE 3R enclosures.
Enclosures can be locked closed and operat-
ing handles can be locked “OFF”. Series
“G” switches have a quick-make, quick-break
mechanism. Fusible switches are available in
1 pole S/N, 2 pole S/N and 3 pole S/N configu-
rations. Non-fusible switches are available in 3
pole configurations. General duty switches are
limited to 240V AC, 200 Amps max. rating.
All 30 Amp compact fusible and non-fusible
“G” prefix switches are rated 10,000 Amp
maximum withstand.
All 30–200 Amp “GF” and “GU” prefix
switches are suitable for use on systems
capable of delivering not more than 100,000
RMS symmetrical Amps of fault current with
Class “R” fuses and the appropriate adapter
kit installed. These 100–200 Amp “G” pre-
fix switches may also be used on systems
capable of delivering not more than 100,000
RMS symmetrical Amps of fault current with
“T” fuses and the appropriate adapter kit
installed. In addition, 100–200 general duty
switches may also be used with J fuses on
systems not capable of delivering more than
100,000 RMS symmetrical amperes of fault
current. General duty switches are UL Listed
for use as service equipment and are horse-
power rated for use with motor loads.
General duty enclosed switches are used for
light duty applications where loading and
switching operations are not excessive.
Heavy Duty Switches, Single
Throw; Prefix “H”
Heavy duty switches are available in indoor
TYPE 1, outdoor TYPE 3R, Watertight Type
4/4X, and industrial TYPE 12 enclosures. Dual
cover interlocks are provided, such that the
door cannot be opened with the switch “ON”
and the switch cannot be turned “ON” with
the door open. A defeat mechanism allows
servicing by authorized personnel. Handles
may be locked “OFF” with up to 3 pad-
locks, and doors may be padlocked closed.
Mechanism is “TEASE-PROOF” quick-make,
quick-break. Fusible switches are available in 2
pole S/N, 3 pole and 3 pole S/N. Non-fusible
switches are available in 3 pole.
Suitable for use on systems capable of deliv-
ering not more than 200,000 RMS symmetri-
cal amperes of fault current when Class “J”
or “R” fuses are installed except the 800 and
1200A switches, which are suitable for use
on circuits capable of delivering not more than
200,000 RMS symmetrical amperes of fault
current when Class “L” fuses are installed.
100–1200A switches with Class “T” fuses
and field adapter kit 200,000 RMS symmetri-
cal rated.
Heavy duty switches are dual horsepower
rated and are listed by UL for use as service
entrance equipment.
Heavy duty switches are intended for applica-
tions where rugged construction, reliable per-
formance, continuity of service
and ease of maintenance are required.
Protector-Lock
®
Switches;
Prefix “H”
The Murray Protector-Lock
®
switch is
designed to eliminate shock hazard due to
disconnecting heavy duty portable electrical
equipment under load. When the switch is in
the “ON” position, the safety bar blocks the
self-contained receptacle and prevents inser-
tion or removal of the plug. When the switch
is “OFF”, the bar retracts, allowing insertion
or removal of the plug.
Protector-Lock
®
switches consist of a
heavy duty, 30 or 60 Amp, 600V AC, 3 pole
fusible or non-fusible enclosed switch, and
either Crouse-Hinds
®
or Arrow Hart
®
Industrial receptacles.
Applications include industrial plants where
portable conveyors and welders are used, and
truck terminals where on-board refrigeration
units require stand-by power.
Double Throw Switches;
Prefix “HD”
Double throw switches are available in TYPE 1
and TYPE 3R enclosures. Covers are dual
interlocked with the operating mechanism
such that the cover cannot be opened when
the switch is in either “ON” position, and the
switch handle cannot be moved to either
“ON” position if the cover is open. Handle
may be padlocked in the “OFF” position.
Switching action is quick-make, quick-break in
both “ON” positions.
They are available in 30–200 Amp ratings,
240V AC, fusible and non-fusible, two and
three pole.
Double throw switches are usually applied as
transfer switches to switch a load from one
power source to another, but can be field con-
verted to switch one power source between
two loads. Switching mechanism is
located on line side of fuses allowing for a
safer fuse replacement. All are suitable for use
as service equipment.
Industry and Government
Specifications
Murray enclosed switches meet or exceed the
latest revision of the following specifications:
Industry
NEMA
Standard #KS-1-2001
UL-Standard #98
U.S. Government
HD single throw, prefix “H”:
Standard #WS-865c type “HD”
HD double throw, prefix “HD”:
Standard #WS865c type “NDD”
GD 60–600 Amp, prefix “G”:
Standard #WS 865c type “ND”;
except where interlock is required.
GD 30 Amp, prefix “G”:
Standard #WS-865c type “ND”;
except where interlock is required.
Arrow Hart
®
and Crouse-Hinds
®
are registered trademarks
of Cooper Industries, Inc.
Protector-Lock
®
is a registered trademark of Siemens
Energy & Automation Inc.
Safety Switches
Technical Information
Product Category GDSM and HDSM