Micrologic Trip Units

PowerPact® P- and R-frame molded case circuit breakers and all Masterpact® power circuit breakers are equipped with the Micrologic® trip system to protect power circuits and loads. Micrologic trip systems use a set of current transformers (called CTs or sensors) to sense the current, a trip unit to evaluate the current m and a tripping solenoid to trip the circuit breaker. Micrologic trip-units are field-interchangeable.

Protection Level

2.0 – LS0: Long Time+ Short Time+ Zero Delay protection, IEC rated
3.0 – LI: Long Time + Instantaneous protection, UL Listed and ANSI Certified
5.0 – LSI: Long Time + Short Time + Instantaneous protection, UL Listed, ANSI Certified, and IEC Rated
6.0 – LSIG: Long Time + Short Time + Instantaneous + Ground fault protection, UL Listed, ANSI Certified, and IEC Rated

ModelsMicrologic (Standard) 2.0, 3.0 and 5.0 Trip Units

• True RMS sensing
• LI, LSI trip configurations
• LS0 trip configuration for IEC
• Field-interchangeable long-time rating plugs
• LED long-time pickup indication
• Test kits available
• Thermal imaging

Micrologic (Ammeter) 2.0A, 3.0A, 5.0A and 6.0A Trip Units

Includes all features listed for Micrologic standard trip unit, as well as:

• LI, LSI, LSIG trip configurations
• LS0 trip configuration for IEC
• Digital ammeter—phase and neutral (4-pole only)
• Phase loading bar graph
• LED trip indication
• Zone-selective interlocking (ZSI) (short-time & ground-fault)
• Optional Modbus® communications—PowerLogic® compatible

Micrologic (Power) 5.0P and 6.0P Trip Units

Power measurement and advanced protection features includes all features listed for Micrologic ammeter trip unit, as well as:

• LSI trip configuration with programmable ground fault alarm
• LSIG (Ground-fault trip) with programmable ground fault alarm
• Incremental “fine tuning” of L, S, I, and G pickup and delay settings
• LCD dot matrix display and LED trip indication
• Advanced user interface
• Advanced protection IDMTL—selectable long-time delay bands
• Neutral protection
• Power measurement
• Contact wear indication
• Modbus communications—PowerLogic compatible
• Local and remote settings

Micrologic (Harmonic) 5.0H and 6.0H Trip Units

Power quality measurement and advanced protection features. Includes all features listed for the Micrologic P (Power) trip unit, as well as:

• Enhanced power measurements functions
• Power quality measurements

Related Products

• Masterpact Universal Power Circuit Breakers
• PowerPact P-Frame Molded Case Circuit Breakers
• PowerPact R-Frame Molded Case Circuit Breakers