The LA1LC072E is a TeSys Integral undervoltage trip (instantaneous undervoltage release) from Schneider Electric's TeSys range, designed to drop a contactor or motor starter when the control voltage falls below a set threshold. It operates on a 48 V AC 50/60 Hz control circuit (Uc), with a tripping threshold of 0.35 to 0.7 Uc — meaning it releases the main device when the control voltage drops to roughly 17–34 V AC. The unit has no built-in time delay, so it trips immediately on undervoltage, and draws 8 VA inrush, 4 VA holding. Supplied as a set of 10 pieces.
Sourcing reality — obsolete part
For a BOM that calls out this exact TeSys Integral undervoltage trip, sourcing is handled on a quoted-to-order basis against an RFQ — confirm quantity and we'll check the market.
The 48 V AC control voltage (Uc) is the coil rating — this trip coil must match the control voltage of the contactor or starter it protects. The 0.35–0.7 Uc tripping threshold means it releases when the line voltage drops to about 17–34 V AC, which is typical for instantaneous undervoltage protection on motor circuits. The 8 VA inrush and 4 VA holding draw are modest — well within the capacity of a standard 48 V AC control transformer, but worth checking if the transformer is already heavily loaded on a dense panel. Being part of the TeSys Integral family, this trip physically mounts onto compatible TeSys Integral contactors and starters — it's a service-part accessory, not a standalone device.