MB30-CS datasheet(2/105 Pages) MITSUBISHI

2 / 105 page

1. INTRODUCTION ............................................... 2

2. FEATURES ....................................................... 3

2.1 Arc-Extinguishing Device – ISTAC .................. 3

2.2 Digital ETR ......................................................... 4

3. CONSTRUCTION AND OPERATION ............... 6

4. CHARACTERISTICS AND

PERFORMANCE ............................................. 11

4.1 Overcurrent-Trip Characteristics ................... 11

4.2 Short-Circuit Trip Characteristics .................. 11

4.3 Effects of Mounting Attitudes ........................ 12

4.4 DC Tripping Characteristics of AC-Rated

MCCBs .............................................................. 12

4.5 Frequency Characteristics ............................. 12

4.6 Switching Characteristics ............................... 13

4.7 Dielectric Strength ........................................... 13

5. CIRCUIT BREAKERS SELECTION ............... 14

5.1 Circuit Breakers Selection Table ................... 14

6. PROTECTIVE CO-ORDINATION ................... 39

6.1 General ............................................................. 39

6.2 Interrupting Capacity Consideration ............. 40

6.3 Selective-Interruption ...................................... 41

6.4 Cascade Back-up Protection .......................... 68

6.5 I2t Let-Through Characteristics and Current

Limiting Characteristics .................................. 70

6.6 Protective Coordination with Wiring ............. 71

6.7 Protective Coordination with

Motor Starters .................................................. 74

6.8 Coordination with Devices on the

High-Voltage Circuit ........................................ 76

7. SELECTION .................................................... 79

7.1 For Motor Branch Circuits .............................. 79

7.2 For Lighting and Heating Branch Circuits .... 79

7.3 For Main Circuit ............................................... 80

7.4 For Welding Circuits ....................................... 80

7.5 For Transformer-Primary Use ........................ 82

7.6 For Capacitor Circuits ..................................... 83

7.7 For Thyristor Circuits ...................................... 84

7.8 MDU Breaker .................................................... 90

7.9 Selection of MCCBs in inverter circuit .......... 93

8. ENVIRONMENTAL CHARACTERISTICS ...... 95

8.1 Atmospheric Environment .............................. 95

8.2 Vibration-Withstand Characteristics ............. 96

8.3 Shock-Withstand Characteristics .................. 97

9. SHORT-CIRCUIT CURRENT

CALCULATIONS ............................................ 98

9.1 Purpose ............................................................ 98

9.2 Definitions ........................................................ 98

9.3 Impedances and Equivalent Circuits of

Circuit Components ........................................ 98

9.4 Classification of Short-Circuit Current ........ 101

9.5 Calculation Procedures ................................ 102

CONTENTS

We have the pleasure of providing all our customers with the technical information for Mitsubishi

moulded case circuit breakers. This indicates the fundamental data of our circuit breakers

regarding the applicable standards, constructional principles, and operational performances.

Please refer to the catalogue of our circuit breakers for details of specifications.

Also please stand in need of the handling and maintenance manual for maintaning the circuit

breakers in service continuously.

We do hope they are available for all our customers to built more efficient systems.

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