The ABB XT4HU3225AAA000XXX is a molded case circuit breaker from the XT4H series, fitted with a TMF trip unit rated 225-2250 A. UL/CSA listing meets North American panelboard and switchboard standards.
What the TMF rating means for fit
The TMF 225-2250 designation means the breaker ships with a fixed thermal trip element calibrated for 225 A continuous and a fixed magnetic trip element set to operate between 2250 A.
Deployment context
This 3-pole breaker mounts in a standard ABB XT4 drawout or fixed cradle. The line and load terminals accept copper or aluminum conductors sized for 225 A continuous.