Mitsubishi NF630-SEP - User Manual

ADVANCED AND EVER ADVANCING
MOULDED CASE CIRCUIT BREAKERS
TECHNICAL NOTES
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Summary

2. Features of Advanced MCCB Design

2.1 Arc-Extinguishing Device - ISTAC

Details the ISTAC technology for improved arc extinction and current limiting.

2.2 Digital ETR (Electronic Trip Relay)

Explains the digital trip relay system for precise overcurrent protection.

4. MCCB Characteristics and Performance

4.1 Overcurrent-Trip Characteristics (Delay Tripping)

Details tripping times for overcurrents at different percentages of rated current.

4.2 Short-Circuit Trip Characteristics (Instantaneous Tripping)

5. Circuit Breaker Selection

5.1 Circuit Breaker Selection Table

6. Protective Co-ordination

6.3 Selective-Interruption (Discrimination)

Details combinations for selective coordination between main and branch breakers.

6.7 Protective Coordination with Motor Starters

Details coordination criteria for MCCBs with motor starters.

7. Selection of MCCBs for Specific Applications

7.1 Motor Branch Circuits

Guides MCCB selection for motor branch circuits considering starting current.

7.4 For Welding Circuits

7.5 MCCBs for Transformer-Primary Use

7.7 MCCBs for Thyristor Circuits

9. Short-Circuit Current Calculations

9.3 Impedances and Equivalent Circuits of Circuit Components

9.5 Calculation Procedures

Mitsubishi NF630-SEP Specifications