Frequently asked questions

FA126342

28 September 2021

Issue:
Can the ground fault pickup be disabled on a Micrologic 6.0A (Ammeter), 6.0P (Power) or 6.0H (Harmonic) trip unit?
 
Product Line:
Micrologic, Masterpact, Powerpact
 
Environment:
6.0 (A, P, H) trip units on Powerpact P- and R-frames, Masterpact NW- and NT-frames

Cause:
Need to disable ground fault on a breaker with LSIG trip functions
 
Resolution:  
No. To eliminate ground fault protection, replace the trip unit with a 5.0 type.  
For ground fault alarm, replace the trip unit with a 5.0P trip unit (S163A) and use a M2C (S64273) or M6C (S64204) programmable contact module.  If replacing a standard trip unit (not A, P or H), the 12-pin connector for the trip unit (kit S33101 for Masterpact, S33100 for Powerpact) must also be ordered.  

Note:  if ground needs to be temporarily disabled for primary injection testing, refer to FA98682.  

See instruction bulletins:  
Powerpact P, R, and Masterpact NW, NT Micrologic™ 5.0P and 6.0P Trip Units, see 48049-137-05