Masterpact NT Circuit breakers and switch-disconnectors IEC from 600 to 1600 A User manual Over the years, other major manufacturers have tried to keep up by developing products incorporating Masterpact's most innovative features, including the breaking principle, modular design and the use of composite materials. Masterpact™ NT/NW Universal Power Circuit Breakers ANSI C37/UL 1066 Rated When used in conjunction with an overcurrent relay, circuit breaker, or fuse. Includes sensor plug. When used in conjunction with an overcurrent relay, circuit breaker, or fuse. Includes sensor plug. Table 5: T-, W-, and Y-Frame Fixed Non-Automatic Switch Frame Rating MASTERPACT NT User manual E60055A Low Voltage Products We do more with electricity. User manual for Masterpact NT circuit breakers Discovering Masterpact Using Masterpact 2 8 Understanding the controls and indications Charging the circuit breaker Closing the circuit breaker Opening the circuit breaker Resetting after a fault trip Locking the All Masterpact circuit breakers are designed to open and close a circuit manually, and to open the circuit automatically at a predetermined overcurrent setting. Masterpact circuit breakers can also: • Enhance coordination by their adjustability. • Provide integral ground-fault protection for equipment.