Mitsubishi NF100-SP - User Manual

ADVANCED AND EVER ADVANCING
MOULDED CASE CIRCUIT BREAKERS
TECHNICAL NOTES
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Mitsubishi NF100-SP Specifications

General

Brand	Mitsubishi
Model	NF100-SP
Category	Circuit breakers
Language	English

Summary

2. FEATURES - Advanced MCCB Design Technology & Performance

2.1 Arc-Extinguishing Device - ISTAC

Details the ISTAC technology for improved current-limiting and breaking performance.

2.2 Digital ETR (Electronic Trip Relay)

Explains the digital trip relay system with double IC for fine protection.

4. CHARACTERISTICS AND PERFORMANCE

4.1 Overcurrent-Trip Characteristics (Delay Tripping)

Explains delay tripping times for overcurrents and ambient temperature effects.

4.2 Short-Circuit Trip Characteristics (Instantaneous Tripping)

Discusses instantaneous tripping and its adjustability for coordination.

5. CIRCUIT BREAKER SELECTION

5.1 Circuit Breaker Selection Table

Provides a table for selecting breakers based on various characteristics and applications.

6. PROTECTIVE CO-ORDINATION

6.1 General

6.2 Interrupting Capacity Consideration

Discusses how to consider interrupting capacity based on transformer capacity and voltage.

6.3 Selective-Interruption (Discrimination)

Explains selective interruption and provides combination tables for MCB-MCCB.

6.5 I²t let-Through and Current Limiting Characteristics

6.6 Protective Coordination with Wiring

6.7 Protective Coordination with Motor Starters

Covers coordination criteria and types for MCCBs with motor starters.

6.8 Coordination with Devices on the High-Voltage Circuit

7. SELECTION

7.1 Motor Branch Circuits

Discusses selecting MCCBs for motor branch circuits, considering starting current.

7.2 For Lighting and Heating Branch Circuits

7.3 For Main Circuits

7.4 For Welding Circuits

7.5 MCCBs for Transformer-Primary Use

7.6 MCCBs for Use in Capacitor (PF Correction) Circuits

7.7 MCCBs for Thyristor Circuits

7.8 Selection of MCCBs in inverter circuit

Discusses MCCB selection for inverter circuits with distorted-wave currents.

9. SHORT-CIRCUIT CURRENT CALCULATIONS

9.3 Impedances and Equivalent Circuits of Circuit Components

9.5 Calculation Procedures

Provides step-by-step methods and equations for calculating short-circuit currents.