Merlin Gerin Masterpact MP 12H1

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Summary

Introduction to Masterpact MP Circuit Breaker

Interrupting Ratings

Details standard and high interrupting ratings for various breaker models.

Advantages of Masterpact MP Circuit Breaker

Drawout Breaker Design

Describes the 4-position racking mechanism and front access for safety.

Designed for No Maintenance

States the breaker requires no maintenance under normal conditions due to fewer parts.

Improved Safety Features

Details features like segregated compartments, isolation indicators, and reinforced insulation.

State of the Art Protection and Control

Describes microprocessor-based control units offering various protection functions.

Control Units for Masterpact MP

ST 208 D for General Application

Details the ST 208D control unit, its features, and overcurrent protection settings.

ST 308 S - ST 318 S for Selective Application

Details the ST 308S/318S control unit, including ground fault and load monitoring.

ST 408 S - ST 418 S for Selective Application and Generator Protection

Details the ST 408S/418S control unit for selective application and generator protection.

Zone-Selective Interlocking (ZSI)

Explains how ZSI reduces fault duration and locates faults for selective tripping.

Time Current Curves

Overcurrent Protection STR 28 D

Displays time-current curves for overcurrent protection with the ST 28D control unit.

Overcurrent Protection STR 308 S - STR 308 ST

Shows time-current curves for overcurrent protection for STR 308S/ST.

Overcurrent Protection STR 318 S - ST 318 ST

Displays time-current curves for overcurrent protection for STR 318S/ST.

Overcurrent Protection STR 408 S - ST 408 ST

Shows time-current curves for overcurrent protection for STR 408S/ST.

Overcurrent Protection STR 418 S - ST 418 ST

Displays time-current curves for overcurrent protection for STR 418S/ST.

Ground Fault Protection Curves

Appendix

Routine Maintenance Guidelines