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Circuit breakers
LA-3000
Instructions manual
Controls LA-3000 Instructions Manual
Air circuit breaker
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Contents
Table of Contents
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Table of Contents
Table of Contents
Installation and Inspection
Introduction
Receiving and Inspection for Damage
Installation
Storage
If D'_'N~ or DIM< Wppl~Mrnu"V 'N'liuellon, Lor
Maintenance
Renewal Parts
Operation
Description and Function
Stored-Energy Mechanism
Closing/Opening Mechanisms
Trip-Free Mechanism
Maintenance Closing
Racking Mechanism and Drawout Interlock
Springs
Control
Maintenance and Adjustment
Trip Latch Adjustment
Toggle Latch (47) Adjustment
Prop Latch Adjustment
Limit Switch
Motor Drive Unit
Lubrication
Spring Discharge Mechanism
Description and Function
Adjustments
Manual Charging of Stored Energy Springs
Contact Structure
Description and Function
Maintenance, Adjustment, and Replacement
General
Contact Adjustment
Movable Arcing Contact Replacement
Stationary Arcing Contact Replacement
Movable Main Contacts Replacement
Stationary Main Contacts Replacement
Release Magnet
Fuse Functions
Current Limiting Fuse
Trigger Fuse
Figures Typical Release Magnet
Table I - Trip Rating Table - Amperes
Current Transformers
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I
•
I
A
CONTROLS
ALliS CHALMIlRS
INSTRUCTIONS
I~
1 - -
1
1-'
1
BVv X·6670-2
AIR CIRCUIT BREAKER
TYPE LA-3000, LA-4000
& LA-4000F (FUSED)
18X4583
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This manual is also suitable for:
La-4000
La-4000f
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