Table of Contents
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PURPOSE
This instruction book is expressly intended to cover the
operation and maintenance of LBS load interrupter
switches.
It does not purport to cover all possible
contingencies, variations, and details that may arise
during operation or maintenance of this equipment.
If further information is desired regarding this product,
contact the local Cutler-Hammer sales office.
TABLE OF CONTENTS
2.3 Storage
Section 3 - Inspection Before Startup
Section 6 Hardware Torque Chart
For the location of your nearest Cutler-Hammer
distributor, call toll free 1-800-525-2000
SECTION 1 - INTRODUCTION
1.1 Basic Description and Application
The Type LBS switch is a three-pole, manually
operated, quick-make, quick-break switch available in
both 600 ampere and 1200 ampere continuous ratings.
This device is used primarily as a disconnect switch in
AC power systems with maximum voltages up to 7200
volts and may be supplied with or without fuses.
Page
A Type LBS switch without fuses is capable of closing
under fault conditions and interrupting magnetizing and
load currents, but is not intended to interrupt fault
currents. When supplied with fuses, a Type LBS switch
may be used to provide fault protection up to the
3
3
interrupting rating of the fuses. Refer to Table 1 for
3
ratings.
4
LBS Switch Ratings
4
Description
4
4
Switch with internal
fuses (450E max
4
@5kV,
max @ 7.2kV)
Switch with 600E
and 750E fuses
5
(5kV max)
6
Switch with 1100E
7
and 1350E fuses
(5kV max)
Unfused (7.2kV
max)
7
8
*1200A rating is for NEMA 1 enclosure with vented covers.
9
NEMA 3/12 rating (without vents) is 1000A.
10
Table 1
11
Each Type LBS switch is designed for operation in an
enclosure and should not be operated under load with
the enclosure door open.
1.2 Switch Identification
A rating nameplate is located on the handle coverplate
(behind the handle access door) of each type LBS
switch. Contained on this nameplate are the switch
type and ratings as required by industry standards. A
unit nameplate located near the upper left corner of the
medium voltage door contains the factory's general
order number. This number should be given to the
Cutler-Hammer Sales Office if a question should arise
concerning the switch or if renewal parts are required.
Page 2
Fault-
Cont. and
Close
Break
(un-
Current
fused)
600A
40kA
350E
1200A
61kA
1200A*
61kA
1200A
61kA
Ratings
DANGER!
Short-
Fused
time (2
Interrupting
sec)
Rating
Current
(Symm)
25kA
50kA
38kA
40kA
38kA
31.5kA
38kA
N/A
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