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

Models

Micrologic (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

How to Videos

Resetting Peak Values on Micrologic Ammeter Trip Unit

Changing Power Sign on Micrologic Power or Harmonic Trip Unit

Viewing Peak Values on Micrologic Ammeter Trip Unit