Dimensions Guide
Safety First
Square D safety switches are, above all else, built
to increase safety. Visible blades are an important
feature, and they must be visible in real-world
conditions to visually verify that the downstream
circuit is de-energized. Our switch blades are easily
visible, even in the less-than-ideal lighting conditions
where electrical equipment is often installed.
An optional view window adds another degree of
safety through visual verication of switch position
without the need to open the door.
In addition, the design of the Square D safety
switch includes an oversized arc suppressor, a
key feature in the ability of the switch to break the
load by effectively attenuating the arc for a clean
interruption.
Designed for
Long-Term Durability
Rugged construction and corrosion protection
provide the industry’s longest lasting switches.
Galvannealed steel in all single-throw Type 3R and 12
enclosures provides superior corrosion protection.
Type 4X seam-welded enclosures help extend
equipment life by providing excellent environmental
and corrosion protection without the use of a silicone
sealer, which can be incompatible with some
manufacturing processes.
Managing temperatures inside the switch is essential
to providing greater service life. Square D safety
switches feature more copper than other switches
available on the market today. This larger amount
of copper is one of the reasons Square D safety
switches have lower operating temperatures.
Heat is not the only factor that impacts switch
life. The enclosed operating mechanism design
of Square D safety switches reduces the amount
of dust and other contaminants that shorten the
mechanism’s operating life.
Quality
A Full Range of Accessories
Square D safety switches feature a complete
offering of accessories, available either factory-
installed or eld-installable. Factory-installed
options include key interlocks, nameplates, push
buttons, and optional safety colors. Field-installable
accessory options include neutral kit, ground lugs,
electrical interlocks, Class “R” fuse rejection kits,
compression terminals, and conduit hubs.
Efficient Installation
Our time-saving design features make installation
quick and easy.
Square D safety switches feature quick-release
cover latches that are easier to operate than screw-
fasteners. On Type 4X and Type 12 switches, this
design feature ensures a better gasket seal — a
critical feature in adverse operating conditions —
than is available with designs that rely on screw-
fastened covers. Tangential knock-outs enable
easier installation of conduit, without the need for
costly, time-consuming offsets and bends.
Mechanical Endurance Requirements for UL, NEMA, and F-Series Switches
4
Short-Circuit Current Ratings
UL Listed
Fuse Class
General-Duty RMS
Sym Amps
Heavy-Duty RMS
Sym Amps
Plug
10,000 N/A
H 10,000 10,000
K 10,000 10,000
J 100,000 200,000
R 100,000 200,000
T 100,000 200,000
L
— 200,000
* Single-throw switches only.
** Actual number of operations may vary based on environmental conditions.
Number of Operations**
Switch
Rating (Amps)
UL 98 NEMA KS 1
General-Duty
NEMA KS 1
Heavy-Duty
E-Series
Reqmts.
30 and 60
10,000 10,000 15,000 50,000
100
10,000 10,000 14,000 50,000
200
8,000 8,000 12,000 36,000*