Frequently asked questions

FA173583

29 September 2021

ISSUE
What is the replacement for an STR28D, STR38S, STR58U trip unit in an obsolete MP Masterpact breaker?

PRODUCT LINE
Masterpact MP

ENVIRONMENT
MP Masterpact built between year 1987 and 2000


RESOLUTION

Replacement trip units come in one model, STR58U, either with or without ground fault. They are available through Schneider Services only (Westchester, OH).
PLEASE NOTE:  Most (if not all) of these replacement trip units are obsolete and out of stock. Please consider replacing the cradle, breaker, and trip unit with Masterpact NW or MTZ.

Part number with GFP
M1008H2  for breaker with 800 amp sensor, In=800
M10H2       1000
M1612H2    1200
M16H2        1600
M20H2        2000
M25H2        2500
M3230H2     3000
M32H2        3200
M6340H2     4000
M6350H2    5000
M63H2       6300
 
Part number without GFP
M1008H2NG  for breaker with 800 amp sensor, In=800
M10H2NG         1000
M1612H2NG      1200
M16H2NG         1600
M20H2NG         2000
M25H2NG         2500
M3230H2NG     3000
M32H2NG         3200
M6340H2NG     4000
M6350H2NG     5000
M63H2NG        6300