NSX Trip Units

Thermal-magnetic or electronic trip unit?

Thermal-magnetic trip units protect against overcurrents and short-circuits using tried and true techniques. But today, installation optimisation and energy efficiency have become decisive factors and electronic trip units offering more advanced protection functions combined with measurements are better ...

Thermal-magnetic or electronic trip unit?

Thermal-magnetic trip units protect against overcurrents and short-circuits using tried and true techniques. But today, installation optimisation and energy efficiency have become decisive factors and electronic trip units offering more advanced protection functions combined with measurements are better suited to these needs. Micrologic electronic trip units combine reflex tripping and intelligent operation. Thanks to digital electronics, these trips have become faster as well as more accurate and reliable. Wide setting ranges make installation upgrades easier. Designed with processing capabilities, Micrologic can provide measurement information and device operating assistance. With this information, users can avoid or deal more effectively with disturbances and can play a more active role in system operation. They can manage the installation, anticipate on events and plan any necessary servicing.

Accurate measurements for complete protection

Compact NSX devices take advantage of the vast experience acquired since the launch of Masterpact NW circuit breakers equipped with Micrologic trip's. From 40 amperes on up to the short-circuit currents, they offer excellent measurement accuracy. This is made possible by a new generation of current transformers combining "iron-core" sensors for self-powered electronics and "aircore" sensors (Rogowski toroids) for measurements. The protection functions are managed by an ASIC component that is independent of the measurement functions. This independence ensures immunity to conducted and radiated disturbances and a high level of reliability.

Numerous security functions

Torque-limiting screws The screws secure the trip within 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's are interchangeable, without wiring. A mechanical mismatch-protection system makes it impossible to mount a trip on a circuit breaker with a lower rating.

"Ready" LED for a continuous self-test

The LED on the front of the electronic trip's indicates the result of the self-test runs 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 Mitop release are operational. The circuit breaker is ready to protect. No need for a test kit. 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, the system consists of:

  • a first adjustment, under de-energised conditions and using a dial, sets the maximum value

  • a second adjustment, made via the keypad or remotely, fine-tunes the setting.

The second setting may not exceed the first. It can be read directly on the Micrologic screen, to within one ampere and a fraction of a second.

Coordinated tripping systems

Compact NSX detects faults even faster and its tripping time is reduced. It protects the installation better and limits contact wear.

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