Chapter 1. Introduction
1-1 Overview
Power Break® II insulated-case switches are designed to serve
low-voltage power circuits and equipment. They are available
with and EntelliGuard® Control Units for operation of
accessories and optional ground-fault detection.
1-2 Receiving the Switch
Unpack the switch and inspect it for shipping damage. Ensure
that the switch has the proper current, voltage, and interrupt-
ion ratings for the application by comparing the catalog
number with the table in the Getting Started section on the
inside front page
.
The weights of the various frame sizes are listed in Table 1, for
reference.
Frame
Rating
Operation
Type
Weight
(lb)
800 A
Manual
Electrical
71
80
1600 A or
2000 A
Manual
Electrical
79
88
2500 A
Front
Connect
Manual
Electrical
178
187
2500 A
Back
Connect
Manual
Electrical
167
176
3000 A
Front
Connect
Manual
Electrical
179
188
3000 A
Back
Connect
Manual
Electrical
216
225
4000 A
Manual
Electrical
320
329
The switch should be stored in a clean location, free from
corrosive gases or fumes. In particular, protect the switch
from moisture and cement dust, as that combination may be
corrosive.
If the switch is stored for any length of time, it should be
inspected periodically to ensure good mechanical condition.
1-3 Preparation for
I
nstallation
Bolted Electrical Connections
Using an industry-accepted solvent, remove any foreign
material from the line and load strap surfaces and the
corresponding surfaces of the connecting bus. Ensure that
the mating surfaces are smooth and free of burrs and nicks.
Place the bus connections in position and align the mounting
holes. Insert and fasten the mounting bolts and washers
according to specifications in Table 2.
Bus Connection
Switch
Frame
Bolt
Diam.
Torque
(in-lb)
800A
(1) 1/2 in.
300
1600-2000A
(2) 1/2 in.
300
2500 A
(4) 3/8 in.
225
3000 A
(4) 3/8 in.
225
4000 A
(6) 1/2 in.
300
1
—
Table 1. Weights of the various switch frame sizes, with and without a motor operator.
Storage
The switch should be placed in service immediately in its
permanent location. However, if it must be stored for an
indefinite period, it should be carefully protected against
condensation, preferably by storage in a warm dry room.
Switches for outdoor equipment should be stored in that
equipment only when power is available and heaters are in
operation, to prevent condensation.
—
Table 2. Bolt sizes and mounting torques for bus connections.
Panel Cutouts and Clearances
Use the following information to prepare the equipment and
assure proper clearances for installation and operation of the
switch.
Figures 1 and 2 show the front-panel escutcheon cutout
patterns and the locations of the switch mounting bolts The
standard door cutout dimensions require a trim plate on the
switch. The optional dimensions are for flush front or non-
hinged door construction and the trim plate may be omitted.
Ventilation cutouts are required for stationary-mounted
switches rated 1600 A and larger and for draw-out switches
rated 2000 A and larger. Ventilation cutouts are
not
required
for draw-out-mounted 800 A or 1600 A frame switches or for
stationary-mounted 800 A frame switches.
