CKT3400T‑U is a Challenger three‑pole trip unit for CK, CKH, and CKV molded‑case breakers in the K‑frame family, designed to upgrade or refurbish protection without replacing the entire enclosure. Rated for 400 A at up to 600 V, this interchangeable trip module provides long‑time and instantaneous trip functions for reliable overcurrent protection on three‑phase circuits in industrial power distribution. This unit is specifically intended for use with CK, CKH, and CKV frames, enabling precise adjustment of protective characteristics in legacy Challenger panels and keeping equipment aligned with contemporary protection schemes.
