Siemens 3RP1540 timing relay with microprocessor, OFF delay without auxiliary voltage, fully cover the functionality of the predecessor types on ASIC basis. Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most of them are explained below:Time Delay DefinitionTime relays perform either on-delay or off-delay timing. An arrow is used to denote the function of the timer. An arrow pointing up indicates an on-delay timing action, while an arrow pointing down indicates an off-delay timing action.On-delay and off-delay timers can turn their connected loads on
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