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Fuji Electric Manuals
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BW100EAG
Technical information
Fuji Electric BW100EAG Technical Information
Molded case circuit breakers & earth leakage circuit breakers
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Contents
Table of Contents
Bookmarks
Table of Contents
Environment and Usage Precautions
Table of Contents
Chapter 1 Protecting Low-Voltage Circuits
Description
Overcurrent Protection
Overcurrent Fault
Phase-Loss Protection
Phase-Loss Fault
Phase-Loss Burnout Protection (Three-Phase Circuit)
Operating Characteristics 2 and Performance Chapter
Chapter 2
Overcurrent Tripping Characteristics
Types of Tripping
Factors Affecting Overcurrent Trip Characteristics
Breaking Performance
Short-Circuit Current Breaking
Breaking Characteristics
Arc Space
Reset Time
Operating Characteristics and Performance
Overload Switching Performance
Performance with Current at 100
Performance with Current at
Temperature Rise
Internal Resistance and Power Consumption
Durability
Switching Durability
Trip Switching Durability
Rated Ultimate Short-Circuit Breaking Performance
Switching Durability of Accessories
Withstand Voltage Performance
Rated Power Frequency Withstand Voltage (IEC 60947-1, 2)
Rated Impulse Withstand Voltage (IEC 60947-1, 2)
Handle Operating Force and Angle
Selection and Application 3
Chapter 3
Selection Check Points
MCCB Selection Check Points
Selecting and MCCB Ratings
Overcurrent Protection Principle
Protective Coordination
Cascade Trip Applications
Conditions for Cascade (Backup) Trip Coordination
Criteria for Cascade (Backup) Trip Coordination
Selective Trip Applications
Selective Trip Coordination of Breakers
Selective Trip Coordination between Mccbs and High-Voltage Side Protective Devices
Selective Trip Coordination with a High-Voltage Fuse
Wiring Protection
Description
Thermal Characteristics of Wire
Application of Protective Devices
Motor Circuit Applications
Description
Applications on the Primary Side of Transformers
Inrush Current for Transformer Excitation
Selecting an MCCB for Transformer Primary Circuit
Transformer Primary-Side Circuit Selection
Welder Circuit Applications
Arc Welders
Resistance Welders
Selecting an MCCB for Capacitor Circuit
Characteristics Specific to Capacitor Circuits
Mccbs for Semiconductor Circuit
Faults and Overcurrents in Thyristor Converters
MCCB Rated Current
Protecting Thyristors from Overcurrent
Protecting Sscs Using Mccbs or Mmss
For Heater (Resistive Load) Circuits
Motor Circuits
Protecting Inverter Circuits Using Mccbs
Inverter Circuits
Mccbs for High Frequency Circuits
Mccbs for DC Circuit Applications
Mccbs for UPS Applications
Mccbs for Servo Amplifier Applications
Ground Fault Protection in System Applications
Grounding Methods and Ground Fault Protection in System Applications
Environment and Usage 4 Precautions Chapter
Standard Conditions
Application to Special Environments
High-Temperature, High-Humidity Applications
Cold Climate Applications
High Altitude Applications
Application to Special Atmospheres
Environment and Usage Precautions
Connection Precautions
Reversed Connection
Tightening Torque
Malfunction Due to Transient Inrush Current
Maintenance Inspections 5
Chapter 5
Faults and Causes
Periodic Inspections
Initial Inspection
Inspection Following Overcurrent Tripping
Replacement Recommendations
Recommendations for MCCB Deterioration Diagnosis and Replacement
Recommended Replacement Guidelines Based on Switching Durability
Calculating Short-Circuit Current
Chapter 6 Short-Circuit Current Calculation
Glossary
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Table of Contents
2
Description
3
Overcurrent Protection
4
Overcurrent Tripping Characteristics
5
Types of Tripping
6
Faults and Causes
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DISTRIBUTION
Molded Case Circuit Breakers & Earth Leakage Circuit Breakers
Technical information
62D4-E-0058
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Chapters
Environment and Usage Precautions
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Operating Characteristics 2 and Performance Chapter
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Selection and Application 3
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Environment and Usage 4 Precautions Chapter
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Maintenance Inspections 5
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Table of Contents
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Summarization of Contents
Introduction
Protecting low-voltage circuits
Description
Overview of common low-voltage circuit faults like overcurrent and phase-loss.
Overcurrent protection
Explanation of how MCCBs protect against overload and short-circuit currents.
Phase-loss protection
Details on protecting motors from phase-loss faults to prevent winding burnout.
Operating characteristics and performance
Overcurrent tripping characteristics
Explains different types of overcurrent tripping mechanisms and factors affecting them.
Breaking performance
Covers short-circuit current breaking, let-through current, and arc space requirements.
Overload switching performance
Details on overload switching test conditions and performance criteria.
Performance with current at 100%
Discusses temperature rise and internal resistance/power consumption at rated current.
Durability
Covers switching durability, trip switching durability, and accessory durability.
Withstand voltage performance
Details on power frequency and impulse withstand voltage tests.
Handle operating force and angle
Provides data on handle operating force and angle for different breaker types.
Selection and application
Selection check points
Outlines key factors to consider when selecting MCCBs for various applications.
Cascade trip applications
Explains conditions and criteria for cascade (backup) trip coordination.
Selective trip applications
Discusses selective trip coordination between breakers and with high-voltage side devices.
Wiring protection
Covers protection of wiring against overcurrents and thermal effects.
Motor circuit applications
Details on protecting motors from overcurrents during starting and operation.
Applications on the primary side of transformers
Covers inrush current and MCCB selection for transformer primary circuits.
Welder circuit applications
Discusses characteristics of welder circuits and MCCB selection for arc and resistance welders.
Selecting an MCCB for capacitor circuit
Highlights capacitor circuit characteristics and MCCB selection criteria.
MCCBs for semiconductor circuit
Addresses faults, overcurrents, and MCCB selection for circuits with thyristors and diodes.
Protecting SSCs using MCCBs or MMSs
Recommends combinations of MCCBs/MMSs for protecting Solid State Contactors (SSCs).
Protecting inverter circuits using MCCBs
Explains how MCCBs protect inverter circuits from power supply overcurrents.
MCCBs for high frequency circuits
Notes limitations of MCCB types for 400Hz circuits and recommendations.
MCCBs for DC circuit applications
Details on MCCB application in DC circuits and operating characteristic changes.
MCCBs for UPS applications
Provides guidelines for selecting MCCBs for UPS systems, considering overload withstand.
MCCBs for servo amplifier applications
Lists MCCB types suitable for servo amplifier power supply switching and protection.
Ground fault protection in system applications
Discusses grounding systems and ground fault protection methods.
Environment and usage precautions
Standard conditions
Lists standard operating conditions for FUJI MCCB performance according to IEC 60947-1.
Application to special environments
Covers considerations for high-temperature, high-humidity, cold climate, and high altitude applications.
Connection precautions
Addresses reversed connection and proper tightening torque for conductors.
Malfunction due to transient inrush current
Explains how to prevent MCCB malfunction caused by transient inrush currents.
Maintenance inspections
Faults and causes
Details common faults during MCCB operation and their countermeasures.
Periodic inspections
Provides guidelines for initial, periodic, and post-overcurrent tripping inspections.
Replacement recommendations
Offers guidance on MCCB deterioration diagnosis and replacement based on durability.
Short-circuit current calculation
Calculating short-circuit current
Explains the objective and formulas for calculating short-circuit current in three-phase circuits.
Glossary
Safety Considerations
Table of Contents
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