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BW100EAG
Fuji Electric BW100EAG User Manual
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DISTRIBUTION
Molded Case Circuit Breakers & Earth Leakage Circuit Breakers
Technical information
62D4-E-0058
2
Table of Contents
Environment and Usage Precautions
3
Default Chapter
3
Table of Contents
3
Chapter 1 Protecting Low-Voltage Circuits
6
Description
6
Overcurrent Protection
7
Overcurrent Fault
7
Phase-Loss Protection
8
Phase-Loss Fault
8
Phase-Loss Burnout Protection (Three-Phase Circuit)
8
Operating Characteristics 2 and Performance Chapter
9
Chapter 2
10
Overcurrent Tripping Characteristics
10
Types of Tripping
10
Factors Affecting Overcurrent Trip Characteristics
10
Breaking Performance
13
Short-Circuit Current Breaking
13
Breaking Characteristics
14
Arc Space
15
Reset Time
27
Operating Characteristics and Performance
28
Overload Switching Performance
28
Performance with Current at 100
29
Performance with Current at
29
Temperature Rise
29
Internal Resistance and Power Consumption
29
Durability
31
Switching Durability
31
Trip Switching Durability
31
Rated Ultimate Short-Circuit Breaking Performance
31
Switching Durability of Accessories
32
Withstand Voltage Performance
33
Rated Power Frequency Withstand Voltage (IEC 60947-1, 2)
33
Rated Impulse Withstand Voltage (IEC 60947-1, 2)
33
Handle Operating Force and Angle
34
Selection and Application 3
35
Chapter 3
36
Selection Check Points
36
MCCB Selection Check Points
36
Selecting and MCCB Ratings
38
Overcurrent Protection Principle
39
Protective Coordination
39
Cascade Trip Applications
42
Conditions for Cascade (Backup) Trip Coordination
42
Criteria for Cascade (Backup) Trip Coordination
42
Selective Trip Applications
45
Selective Trip Coordination of Breakers
45
Selective Trip Coordination between Mccbs and High-Voltage Side Protective Devices
50
Selective Trip Coordination with a High-Voltage Fuse
51
Wiring Protection
54
Description
54
Thermal Characteristics of Wire
54
Application of Protective Devices
56
Motor Circuit Applications
59
Description
59
Applications on the Primary Side of Transformers
65
Inrush Current for Transformer Excitation
65
Selecting an MCCB for Transformer Primary Circuit
65
Transformer Primary-Side Circuit Selection
66
Welder Circuit Applications
68
Arc Welders
68
Resistance Welders
68
Selecting an MCCB for Capacitor Circuit
71
Characteristics Specific to Capacitor Circuits
71
Mccbs for Semiconductor Circuit
75
Faults and Overcurrents in Thyristor Converters
75
MCCB Rated Current
76
Protecting Thyristors from Overcurrent
77
Protecting Sscs Using Mccbs or Mmss
79
For Heater (Resistive Load) Circuits
79
Motor Circuits
80
Protecting Inverter Circuits Using Mccbs
81
Inverter Circuits
81
Mccbs for High Frequency Circuits
82
Mccbs for DC Circuit Applications
83
Mccbs for UPS Applications
85
Mccbs for Servo Amplifier Applications
86
Ground Fault Protection in System Applications
87
Grounding Methods and Ground Fault Protection in System Applications
87
Environment and Usage 4 Precautions Chapter
91
Standard Conditions
92
Application to Special Environments
93
High-Temperature, High-Humidity Applications
93
Cold Climate Applications
93
High Altitude Applications
93
Application to Special Atmospheres
94
Environment and Usage Precautions
93
Connection Precautions
95
Reversed Connection
95
Tightening Torque
95
Malfunction Due to Transient Inrush Current
96
Maintenance Inspections 5
97
Chapter 5
98
Faults and Causes
98
Periodic Inspections
100
Initial Inspection
100
Inspection Following Overcurrent Tripping
101
Replacement Recommendations
102
Recommendations for MCCB Deterioration Diagnosis and Replacement
102
Recommended Replacement Guidelines Based on Switching Durability
102
Calculating Short-Circuit Current
104
Chapter 6 Short-Circuit Current Calculation
104
Glossary
108
4
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Fuji Electric BW100EAG Specifications
General
Poles
3
Rated Current (A)
100
Voltage rating
415VAC
Frequency
50/60 Hz
Trip mechanism
Thermal-Magnetic
Mounting type
Fixed
Breaking capacity
30kA
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