Eaton Magnum SB Series User Manual

Instructions for Installation, Operation
and Maintenance of Magnum SB
Insulated Case Low Voltage Power
Circuit Breakers
effective March 2012Instruction Leaet IB2C12063H03
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM MAINTENANCE
ON EQUIPMENT WHILE IT IS ENERGIZED. DEATH OR SEVERE
PERSONAL INJURY CAN RESULT FROM CONTACT WITH
ENERGIZED EQUIPMENT. ALWAYS VERIFY THAT NO VOLTAGE
IS PRESENT BEFORE PROCEEDING. ALWAYS FOLLOW
SAFETY PROCEDURES. EATON IS NOT LIABLE FOR THE
MISAPPLICATION OR MISINSTALLATION OF ITS PRODUCTS.
WARNING
OBSERVE ALL RECOMMENDATIONS, NOTES, CAUTIONS, AND
WARNINGS RELATING TO THE SAFETY OF PERSONNEL AND
EQUIPMENT. OBSERVE AND COMPLY WITH ALL GENERAL
AND LOCAL HEALTH AND SAFETY LAWS, CODES, AND
PROCEDURES.
CAUTION
TESTING A CIRCUIT BREAKER WHILE IN-SERVICE AND
CARRYING LOAD CURRENT IS NOT RECOMMENDED FOR
POWER AND MEDIUM VOLTAGE CIRCUIT BREAKERS. TESTING
THAT RESULTS IN THE TRIPPING OF THE CIRCUIT BREAKER
SHOULD BE DONE ONLY WITH THE CIRCUIT BREAKER IN A
DEENERGIZED SYSTEM OR IN THE TEST OR DISCONNECTED
CELL POSITIONS OR WHILE IT IS ON A TEST BENCH.
PERFORMING TESTS WITHOUT THE EATON-APPROVED TEST
KIT MAY DAMAGE THE TRIP UNIT.

Eaton Magnum SB Series Specifications

General

Brand	Eaton
Model	Magnum SB Series
Category	Circuit breakers
Language	English

Summary

Section 1: Introduction

Section 2: Receiving, Handling And Installation

Installing Drawout Circuit Breaker

Step-by-step guide for placing drawout breakers onto extension rails.

Rejection Interlocks

Explanation of the interlock system preventing insertion of incompatible circuit breakers.

Levering Circuit Breaker

Detailed procedure for moving breakers between CONNECT, TEST, and DISCONNECT positions.

Section 3: Circuit Breaker Description And Operation

Operating Mechanism

Explanation of the two-step stored energy mechanism for closing and opening.

Anti-Pump Feature

Description of the feature preventing automatic reclosing on fault conditions.

Electronic Tripping System

Overview of the three-part tripping system: trip unit, sensors, and trip actuator.

Microprocessor-based Trip Unit

Introduction to the Digitrip RMS trip units and their interchangeable nature.

Rating Plug

Function and importance of the rating plug for trip unit operation and settings.

Current Sensors

Details on current sensors, their location, and relationship with rating plugs.

Secondary Contacts and Connection Diagrams

Explanation of secondary wiring points and references to connection diagrams.

Section 4: Drawout Circuit Breaker And Cassette

Drawout Cassette

Description of the cassette's interfaces and features for drawout circuit breakers.

Section 6: Inspection And Maintenance

What To Inspect

Specific items and areas to check during maintenance, including external parts and disconnects.

Functional Field Testing

Procedures for testing manual, electrical operations, and trip unit functions.

Arc Chute Inspection

Inspection of arc chutes and chambers for damage, dirt, and erosion.

Primary Contact Inspection

Visual inspection of primary contacts for wear using contact wear indicators.

Breaker Mechanism Inspection

Inspection of mechanism hardware, torque values, and lubrication points.

Rating Plug Replacement

Procedure for safely removing and installing trip unit rating plugs.

Current Sensor Replacement

Procedure for replacing current sensors, including primary disconnects and adaptors.

Accessory Devices

Shunt Trip

Optional device for remote tripping via voltage input, available in various ratings.

Spring Release

Optional device for remote closing via voltage input, with latch check switch option.

Undervoltage Release

Device that opens the breaker when supply voltage falls below a specified threshold.

Motor Operator

Electric motor assembly for electrically charging breaker springs for remote operation.