MasterPacT NW/NT Trip Units

The MicroLogic S, A, P and H, field-installable trip units are available with MasterPacT NW and NT circuit breakers. The circuit breaker overcurrent protection consists of a solid-state, microprocessor-based tripping device that requires no external power source. The complete tripping system has three main components: the molded sensors, the trip device (with rating plug), and the trip actuator. The microprocessor-based trip unit uses true RMS current level sensing. For additional information, refer to the trip unit functionality matrix Trip Unit Comparison.

When a MasterPacT NW or NT circuit breaker is closed, no external power is required for the protection system. The trip unit is powered by current signal levels and current sensors integrally mounted in the MasterPacT NW or NT circuit breaker. All trip units are UL Listed for use in MasterPacT NW or NT circuit breakers.

MicroLogic Basic Trip Unit

Standard Features

True RMS sensing
LI trip configuration
Field interchangeable long-time rating plugs
LED long-time pickup indication
Thermal imaging

Available Options

LSI trip configuration
Test kits

MicroLogic Type A (Ammeter) Trip Unit

Standard Features

True RMS sensing
LI trip configuration
Field interchangeable long-time rating plugs
LED long-time pickup indication LSIG trip configurations
Digital ammeter–phase and neutral
Phase loading bar graph
LED trip indication
Zone selective interlocking (ZSI) with short-time and ground fault
Thermal imaging

Available Options

LSI trip configuration
LSIG (ground fault trip)
Test kits

Available PowerLogic Features

Current metering
Circuit breaker open/close trip status
Tripping curves

Type P (Power Metering) Trip Unit

Standard Features

All standard features of MicroLogic Type A trip unit
LSI trip configuration
Incremental “fine tuning” of L, S, I, and, when selected, G pickup and delay settings
LCD dot matrix display and LED
trip indication
Advanced user interface
Advanced user protection (includes, but not limited to):
- over/under voltage
- over/under frequency

IDMTL: selectable long-time
delay bands
Thermal imaging
Power measurement
Contact wear indication
Zone selective interlocking (ZSI) with short-time and ground fault

Available Options

LSIG (ground fault trip with programmable ground fault alarm)
Test kits

Available Monitoring Features

Current metering
Volts metering
Energy accumulation
Remote operation
Circuit breaker open/close trip status
Date/time stamping

MicroLogic Type H (Harmonics) Trip Unit

Standard Features

All standard features of MicroLogic Type P trip unit
Advanced power measurements functions
Fault waveform capture-locking (ZSI) with short-time and ground fault
Thermal imaging

Available Options

LSIG (ground fault trip) with programmable ground fault alarm
Zone selective interlocking (ZSI) with short-time and ground fault
Test kits

Available Monitoring Features

Current metering
Volts metering
Energy accumulation
Remote operation
Waveform capture
Data logging
Circuit breaker open/close trip status
Power quality measurements
Harmonics measurements through 51st
Date/time stamping

NOTE: Refer to the MasterPacT NT and NW Universal Power Circuit Breakers catalog (0613CT0001) for detailed information about the family of MicroLogic S, A, P and H trip units.