Overview
The LV433966 is a Schneider MicroLogic 7.3 E AL electronic trip unit for the ComPact NSX630 frame, rated 570 A across 3 poles with LSI protection — long-time, short-time, and instantaneous — plus integrated earth-leakage detection. It carries an LCD display for metering and event logs, adjustable long-time delay from 15 to 400 s at 1.5 x Ir, and short-time delay adjustable from 0 to 0.4 s, with a long-time pickup range of 250 to 570 A.
Selection and sizing
The 570 A continuous rating and adjustable long-time pickup down to 250 A let you fine-tune overload protection to the load without swapping the trip unit. The short-time delay range of 0 to 0.4 s supports selective coordination downstream, provided the upstream breaker's delay is set longer.
How it compares
Compared to the LV433806, which is a 4-pole, 100 A MicroLogic 7.3 E AL with fixed long-time delay and no earth-leakage, the LV433966 gives you 3 poles at 570 A, adjustable long-time delay, and integrated earth-leakage — choose the LV433966 when the load exceeds 100 A and you need coordination flexibility.