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
Page
Section 1 - Introduction.
1.1 Basic Description and Application
3
1.2 Switch Identification
3
1.3 Safety Features
3
1.4
Safe
Practices
4
Section 2 - Receiving, Handling and Storage
2.1
Receiving
4
2.2
Handling
4
2.3
Storage
4
Section 3 – Inspection Before Startup
4
Section 4 - Operation
4.1 Mechanical Safety Interlocks
5
4.2 Switch Operation
6
4.3 Fuse Replacement
7
Section 5 - Maintenance
5.1 Inspection Procedure
7
5.2 Alignment Procedures
8
5.3 Replacement Procedures
9
5.4
Lubrication
10
Section 6 Hardware Torque Chart
11
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.
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
interrupting rating of the fuses. Refer to Table 1 for
ratings.
LBS Switch Ratings
Description
Cont. and
Break
Current
Fault-
Close
(un-
fused)
Short-
time (2
sec)
Current
Fused
Interrupting
Rating
(Symm)
Switch with internal
fuses (450E max
@5kV, 350E
max @ 7.2kV)
600A
40kA
25kA
50kA
Switch with 600E
and 750E fuses
(5kV max)
1200A
61kA
38kA
40kA
Switch with 1100E
and 1350E fuses
(5kV max)
1200A*
61kA
38kA
31.5kA
Unfused (7.2kV
max)
1200A
61kA
38kA
N/A
*1200A rating is for NEMA 1 enclosure with vented covers.
NEMA 3/12 rating (without vents) is 1000A.
Table 1
Ratings
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.
DANGER!
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