Use Current to Drive Solenoid, Relay from Array of Voltages (.PDF Download)

Relays and solenoids are available with many different voltage ratings. Most factory- and process-automation equipment operates from 24-V supplies. However, customers may have control signals for a wide range of ac or dc voltages, such as 12 V, 24 V, 36 V, 48 V, or even 120 V or 220/240 V for some valves and contactors. For each voltage, the coil designs of the variants must be different. Having coils to accommodate all of the possible voltage adds to inventory, BOM, and spare-part headaches.

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