Relay coupler. JACKPAC, number of contacts: 1, make contact, rated control voltage: 18 to 30 V DC, continuous current: 0.4 A, M12 plug/socket A-coded. Timing relays are used in automation technology to compensate for malfunctions that occur due to high cycle times. Short pulses are extended in time and thus reliably detected by the downstream control modules. Various timing functions such as switch-on/switch-off delay, clock generator, and star-delta switching are available to the user.