Undervoltage control relay 1P+N/3P+N 2 changeover contacts. Control and monitoring relay for undervoltage in single and three-phase networks (L+N, 3L+N). Suitable for systems with emergency power supply and safety lighting in accordance with DIN0108-0100 and DIN0100-718. Fixed switching threshold at 0.85 x Un and fixed hysteresis of 5%. With test function for simulating undervoltage triggering. Mounting on a top hat rail (DIN rail), with LED signaling.