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Siemens-Allis Manuals
Circuit breakers
LA3000A
Instructions manual
Siemens-Allis LA3000A Instructions Manual
Unfused air circuit breakers with manual or electrical operators
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Contents
Table of Contents
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Table of Contents
Table of Contents
Warranty
Installation and Inspection
Receiving and Inspection for Damage
Installation
Storage
Maintenance
Operation
Description
Manually-Operated Breaker
Table 1 Operating Procedure - Manually-Operated Breakers
Electrically·operated Breaker
Drawout Interlock
Racking Mechanism
Table 2 Operating Procedure - Electrically· Operated Breakers
Spring Discharge Interlock
Maintenance and Adjustments
Maintenance
Lubrication
Maintenance Closing
Maintenance Closing
Adjustments
Trip-Latch Engagement
Main Contact Make
Table 3 Maintenance Closing
Lifting Bar & Rail Extensions
Arcing Contact Make
Contact Replacement
Main Contact Fingers
Stationary Arcing Contact
Hinge Contact Fingers
Moving Arcing and Main Contact
Tripping Actuator
Motor Cutoff Switch
Shunt Trip Option
Current Sensors
Bell Alarm Switch Option
Static Trip Option
Umitrip
Table 4 Trip Rating Table - Amperes
Fig. 1 Tyoical LA-30Ada Breaker Outline
Fig.2 T,,;,Ical LA-3000A-4000A Operator
Typical Wiring Diagram - Electrically Operated Breakers
Typical Racking Mechanism and
Handling Instruction
Fig.6 Typical Panel Assembly
Fig.7 Secondary Disconnect
Fig.8 Auxiliary Switch
Shunt Trip
Lubricating Instructions
Instruction Book Ref
Limitrip
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Installation and Inspection
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r
SIEMENS-ALLIS
----
-
~~-~
INSTRUCTIONS
TYPES LA3000A & LA4000A (UNFUSED)
AIR CIRCUIT BREAKERS'
WITH
MANUAL OR ELECTRICAL
OPERATORS
. .
-
18X5689
MAY, 1977
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La4000a
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