A Masterpact NW40, 3 pole breaker fails secondary injection testing with the full function test kit, S33595. It reads half the current on the trip unit.


26 May 2022

FFTK not showing accurate data.

Product Line:
Circuit Breakers

In order to test the new NW40, W-frame breaker, set the type to NW40b in the FFTK test set, ANSI standard, and you also need the FFTK version 1.10 or higher.

Notes: Sometimes you will run across a situation where the breaker type in the test set will not let you change it to NW40b. The cause of this is an incorrect set up in the trip unit, where they may have set the trip unit as NW40. Since there is no NW40b in the trip unit yet, you have to go into Micrologic setup and set the parameters to "undefined", then it will let you select NW40b in the FFTK.

Cheats: If you are in a pinch with firmware 1.00. Set the FFTK to NW40 and IEC standard, it will pass the trip unit. The reason why this works is because the IEC 4000 amp breaker is also a 3 pole breaker.