The LV839347 is a MasterPact MTZ1 cradle — the drawout frame that accepts the breaker mechanism. Rated 800 to 1600 A at 104 °F (40 °C), 4-pole, it is the structural and electrical interface between the breaker and the switchgear bus. UL/ANSI listed, so it lands in North American panel schedules without a compliance review.
Fit and lifecycle — still in active production
Current-production part. For a cradle this means the MTZ1 platform remains supported — spare cradles, breaker inserts, and arc-chute kits stay available through standard distribution.