Undervoltage control relay VDE 1P+N/3P+N 1 changeover contact. 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 DIN VDE 0108-0100 and DIN VDE 0100-718. Fixed switching threshold at 0.85 x Un and fixed hysteresis of 5%. Mounting on top hat rail (DIN rail), with LED signaling.