Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers

General Information

02/2016

Accurate Measurements for Complete Protection

PowerPact H-, J-, and L-frame circuit breakers devices offer excellent measurement accuracy from

15 amperes on up to the short-circuit currents. This is made possible by a new generation of current

transformers combining “iron-core” sensors for self-powered electronics and “air core” sensors

(Rogowski coils) for measurements. The protection functions are managed by an ASIC (Application

Specific Integrated Circuit) component that is independent of the measurement functions. This

independence ensures immunity to conducted and radiated disturbances and increases reliability.

Numerous Security Functions

Torque-limiting screws

The screws secure the trip unit to the circuit breaker. When the correct tightening torque is

reached, the screw heads break off. Optimum tightening avoids any risk of temperature rise. A

torque wrench is no longer required.

Easy and sure changing of trip

units

All trip units are interchangeable, without wiring. A mechanical mismatch-protection system

makes it impossible to mount a trip unit on a circuit breaker with a lower rating.

“Ready” LED for a continuous

self-test

The LED on the front of the electronic trip units indicates the result of the self-test running

continuously on the measurement system and the tripping release. As long as the green LED is

flashing, the links between the CTs, the processing electronics and the tripping mechanism are

operational. The circuit breaker is ready to protect. A minimum current of 15 to 50 A, depending

on the device, is required for this indication function.

A patented dual adjustment

system for protection functions.

Available on Micrologic 5/6 trip units, the system consists of:

• an adjustment using rotary switches sets the maximum value

• an adjustment using the keypad or made remotely, fine-tunes the setting. This setting may

not exceed the first one. It can be read directly on the Micrologic trip unit screen, to within

one ampere and a fraction of a second.