The operation algorithm of the voltage control relay is as follows: if the relay is connected to the supply voltage and the inter facial voltage does not go beyond the range set using the upper and lower circular switches, then the relay is operational - the RELAY indicator is lit, pins 2-3 are closed, the indicator ON illuminated indicator U> and or Specification: Manufacturer:   Tense Producing country: Turkey Type of installation: DIN rail Phase sequence control: Yes additional characteristics:  U min +  U max +  The size 35x90 (65) x58 Installation DIN  Phases 3 Package Includes: 1 x 3-phase voltage control relays with off-delay timer phase sequence GK-14F Tense