Overview
The LV433963 is a MicroLogic 4.3 AL electronic trip unit for the Schneider ComPact NSX630 molded-case circuit breaker, rated 570 A switching current on a 440 V AC distribution network with 4 poles and LSoI protection functions (long-time, short-time, instantaneous). It carries UL 508, IEC 60947-2, EN 60947-2, and NEMA AB1 certifications, with integrated earth-leakage protection and a fixed long-time delay adjustment range of 11 s at 7.2 x Ir, 16 s at 6 x Ir, and 400 s at 1.5 x Ir.
Lifecycle and sourcing
Schneider lists the LV433963 as discontinued; no official successor is named in the current catalogue. Remaining units are available through surplus and broker channels — send an RFQ to confirm quantity and lead time for a line-down or last-time-buy decision.