Time Delay Relays
Time delay and timing relays are typically provided with adjustable time settings to accommodate many possible applications. On-delay relays, for example, will not allow a circuit to close until a preset time has elapsed following energization of the relay coil. Conversely, an off-delay relay keeps the circuit closed for a specified period after the power has been removed. Such basic timing functions are quite common and make up the bulk of timing relay sales.
Safety and efficiency are greatly enhanced in industrial applications by the use of timer relays. These electromechanical devices introduce a controlled delay between the moment power is applied to the relay and the moment the relay actually switches. This delay, often just a few seconds, is crucial for preventing power surges from damaging sensitive components in the systems they control and for preventing the too-sudden (and potentially harmful) alternate energization of different parts of the system. Relays are an essential part of the control circuitry in many industrial applications, including conveyor belts, HVAC systems, and lighting control.
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