The Schneider Electric LA1LC071B is a shunt trip accessory from the TeSys Integral range, designed for control applications on Integral motor starters. It provides instantaneous tripping when its control voltage is applied, with an operating time of >= 10 ms. It is a shunt trip release, meaning it receives a separate control signal to mechanically trip the starter's switching mechanism. This is distinct from an undervoltage release, which trips when voltage drops below a threshold.
Control circuit and voltage characteristics
Rated for a control circuit voltage of 24 V AC at 50/60 Hz, the LA1LC071B will operate across a voltage range of 0.7 to 1.1 times the nominal Uc. The threshold tripping voltage is between 0.35 and 0.7 Uc, meaning the shunt trip will reliably actuate when the control voltage reaches at least 8.4 V AC. Power consumption is 8 VA inrush and 4 VA hold-in at the rated control voltage. This is the load the control transformer or PLC output must handle during the trip pulse.
Sourcing reality: obsolete status
Sourcing for this part is limited to the surplus and broker market. Buyers with a BOM line locked to this order code should expect to source it against an RFQ through independent channels.
Physical and packaging details
Supplied as a set of 10 units, each with screw-type terminals for wiring. The part is a component accessory, not a standalone device, and mounts directly onto the Integral starter base. No time delay is built in — the trip is instantaneous upon application of the control voltage. For delayed tripping applications, a different variant with a time-delay module would be required.