Can you change or replace a Micrologic Series B trip unit?
Can a Micrologic series B (or older) trip unit on a legacy breaker be replaced, changed, or
LX, LXI, LE, MX, ME, NX, NE, PX, PE, and SE circuit breaker frames
Electrical Distribution Systems
Need to add ground fault sensing to existing breaker or replace bad trip unit
The SE trip units can be changed by Field Services (see Supplemental Digest for availability).
The ground fault function cannot be added to or deleted from an SE breaker.
A replacement trip unit may be installed ONLY in the breaker it is identified for.
The other breakers with Micrologic Series B and earlier trip units CANNOT be replaced. These include LE, LX LXI ME MX NE NX PE PX type breakers.