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Fuji Electric EW50AAG User Manual

Fuji Electric EW50AAG
114 pages
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DISTRIBUTION
Molded Case Circuit Breakers & Earth Leakage Circuit Breakers
Technical information
62D4-E-0058

Table of Contents

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Fuji Electric EW50AAG Specifications

General IconGeneral
Poles3
Rated Current (A)50
Rated Voltage (V)690
Trip CharacteristicThermal Magnetic
Mounting TypeFixed

Summary

Introduction to Fuji Electric MCCBs

Chapter 1: Protecting Low-Voltage Circuits

1-1 Circuit Fault Description

Overview of common low-voltage circuit faults and protection needs.

1-2 Overcurrent Protection

Details on protecting circuits from overcurrent faults like overload and short-circuit.

1-3 Phase-Loss Protection

Explanation of protection against phase-loss faults in electrical circuits.

Chapter 2: Operating Characteristics and Performance

2-1 Overcurrent Tripping Characteristics

Explains different types of overcurrent tripping behavior in MCCBs.

2-2 Breaking Performance

Details the performance of MCCBs during short-circuit current interruption.

2-3 Overload Switching Performance

Covers performance aspects during overload switching tests.

2-4 Performance at Rated Current

Discusses temperature rise and power consumption at 100% current.

2-5 Durability

Outlines switching and trip switching durability specifications.

2-6 Withstand Voltage Performance

Details power frequency and impulse withstand voltages.

Chapter 3: Selection and Application

3-1 Selection Check Points

Lists key factors and considerations for selecting MCCBs for various applications.

3-2 Cascade Trip Applications

Explains cascade (backup) trip coordination between protective devices.

3-3 Selective Trip Applications

Details selective trip coordination for improved system reliability.

3-4 Wiring Protection

Covers methods for protecting electrical wiring from overcurrents.

3-5 Motor Circuit Applications

Discusses MCCB selection and protection for motor circuits.

3-6 Transformer Primary Applications

Explains MCCB selection for transformer primary side circuits.

3-7 Welder Circuit Applications

Addresses MCCB selection and considerations for welder circuits.

3-8 MCCB Selection for Capacitors

Guides MCCB selection for phase advance capacitor circuits.

3-13 MCCBs for DC Circuit Applications

Details MCCB selection and application for DC circuits.

3-16 Ground Fault Protection

Explains grounding methods and ground fault protection in systems.

Chapter 4: Environment and Usage Precautions

4-1 Standard Operating Conditions

Lists standard ambient and environmental conditions for MCCB use.

4-2 Special Environment Applications

Discusses MCCB application in challenging environments like high humidity or corrosive atmospheres.

4-3 Connection Precautions

Covers important precautions for MCCB wiring and connection.

4-4 Transient Inrush Current Malfunctions

Addresses potential MCCB malfunctions due to transient inrush currents.

Chapter 5: Maintenance Inspections

5-1 Faults and Causes

Identifies common MCCB faults and their potential causes.

5-2 Periodic Inspections

Outlines procedures for initial, periodic, and post-trip MCCB inspections.

5-3 Replacement Recommendations

Provides guidelines for MCCB replacement based on deterioration and durability.

Chapter 6: Short-Circuit Current Calculation

6-1 Calculating Short-Circuit Current

Details the process and formulas for calculating short-circuit current.

Safety Considerations

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