Micrologic-trip-unit-masterpact-nw-selection-guide

Choosing the right trip unit ensures protection, precision and performance for your Masterpact NW Air Circuit Breakers (ACBs). Below is a quick, side-by-side comparison of the Micrologic 2.0, 5.0 and 6.0 trip units to help you decide which one fits your system best. All units below are genuine Schneider Electric product, available from stock in Dubai.

Micrologic 2.0 vs 5.0 vs 6.0: Quick Comparison

A Micrologic 3.0 unit (LI with an adjustable instantaneous stage) is also available where a simpler adjustable option is required. All Micrologic trip units share the same fault-sensing principle, using current transformers to measure true-RMS current across the poles.

Need Help Deciding?

• If your goal is basic protection, go for Micrologic 2.0.
• For adjustable protection and current metering, choose Micrologic 5.0.
• For smart monitoring and energy analytics, Micrologic 6.0 is your best option.

A common approach is to standardise on Micrologic 5.0 for most feeders and step up to 6.0 on incomers and on circuits where earth-fault protection or energy metering is specified. Because the units are field-interchangeable, you can also start with 5.0 and upgrade to 6.0 later as requirements change.

How to Select the Correct Masterpact NW Configuration

Trip unit choice is only one part of the selection. To specify a complete Masterpact NW breaker, work through:

• Frame size by rated current: Masterpact NW spans 800A to 6300A across two frame sizes.
• Performance class by breaking capacity: N1, H1, H2, H3 or L1, chosen against the prospective fault level at the point of installation.
• Construction: fixed or draw-out, 3-pole or 4-pole.
• Trip unit: 2.0, 3.0, 5.0 or 6.0, matched to the protection functions and metering the application needs.

Send your fault level, rated current and pole configuration and our engineer will confirm the correct frame, performance class and trip unit before you order.

Genuine Masterpact NW Trip Units in Stock in Dubai

Electrical Junction supplies genuine Schneider Electric Masterpact NW breakers and Micrologic trip units from stock at our counter in Naif, Deira, Dubai, with delivery across the UAE and export to Saudi Arabia, the wider GCC and African markets. For Saudi Arabia shipments we can help with SASO and SABER conformity documentation.

• Genuine Schneider Electric product with traceability available on request
• Micrologic 2.0, 3.0, 5.0 and 6.0 trip units for Masterpact NT and NW
• Same-day counter collection in Dubai, GCC and Africa export from Jebel Ali

Call +971 4 267 6484 or send your Masterpact reference and trip unit requirement on WhatsApp for a same-day quotation.

Frequently Asked Questions

What is the Micrologic trip unit used for in Masterpact NW breakers?

The Micrologic trip unit is an electronic protection module for Masterpact NT and NW circuit breakers that monitors current via sensors (CTs) and provides adjustable protection functions such as long-time, short-time, instantaneous and ground-fault, depending on the model.

How do I select the correct Micrologic trip unit for a Masterpact NW breaker?

Selection involves choosing the frame size by rated current, since Masterpact NW spans 800A to 6300A across two frame sizes, and the performance class by breaking capacity (N1, H1, H2, H3 or L1). You then choose the trip unit type (2.0, 3.0, 5.0 or 6.0) based on the required protection functions (LI, LSI, LSIG) and any metering or communication needs.

What is the difference between trip unit types like 5.0 and 6.0 in the Micrologic series?

In the Micrologic trip family, the 5.0 (LSI) offers long-time, short-time and instantaneous protection, while the 6.0 (LSIG) adds ground-fault protection on top of LSI. If your application requires ground-fault protection or advanced metering, the 6.0 is the one to consider.

What data should I collect before performing a selection study for a Micrologic trip unit?

Key data includes the required continuous ampacity (breaker rating), fault current levels (interrupting rating), system configuration (3-pole or 4-pole, draw-out or fixed), coordination requirements for up and downstream devices, and the protection functions required (LI, LSI or LSIG), plus any metering or communication needs.

Does true-RMS sensing matter in Micrologic units, and why?

Yes. True-RMS sensing lets the trip unit measure current accurately even when the waveform is distorted by harmonics. This ensures correct protection in modern installations with non-sinusoidal loads.

How should I coordinate the Micrologic trip unit settings for optimal protection and selectivity?

After selecting the correct trip unit type, set the long-time pickup (Ir), short-time pickup and delay, instantaneous pickup, and ground-fault pickup and delay where applicable. A coordination study is recommended so that upstream breakers only trip under higher fault conditions while downstream devices clear lower faults.

Can I upgrade the protection level of a Micrologic trip unit later?

Yes. Because the trip units are modular and field-interchangeable, you can upgrade to a unit with more protection functions or metering, for example from 5.0 to 6.0, as your system requirements evolve.