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NF50-HRP Datasheet(PDF) 2 Page - Mitsubishi Electric Semiconductor |
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NF50-HRP Datasheet(HTML) 2 Page - Mitsubishi Electric Semiconductor |
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2 / 105 page  1 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. |
Similar Description - NF50-HRP |
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