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It reduces contact noise by reducing large voltage and current spikes as the relay is opened and closed, called a snubbing resistor.

Before the age of solid state controllers, there were no resistors across the solenoids. The purpose of the resistor is to provide a charging voltage for the capacitors inside the solid state contoller. Without the resistor it would take several seconds for the (50,000 microfarad) capacitor to charge and the equipment to run. With the resistor the capacitors are charged while the solenoid is open and the equipment is ready to run at all times.

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15y ago
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Q: Why is there a resistor on a 36v solenoid?
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