Multi-voltage contactors and controls and related methods

A relay switch control configured for connection with one or more components and one or more line voltage sources, the relay switch control comprising:

• a processor;
• a relay operable by the processor to electrically connect or disconnect the one or more line voltage sources;
• and
• a control circuit configured to be coupled for communication with and/or to transmit control signals to the processor, the control circuit including a common terminal, a first terminal capable of receiving a voltage input of 24 VAC, and a second terminal capable of selectively receiving a voltage input within a range of voltage inputs including 120 VAC, 208 VAC, 240 VAC, or 250 VAC;
• wherein the processor is configured to be operable for determining input voltage and adjusting brownout threshold;
• wherein the relay switch control is configured to:
• at power up, determine a voltage level set within a memory;
• if the voltage level is set at 120 VAC within the memory, set the brownout threshold at 93 VAC;
• if voltage level is set at 240 VAC within the memory, set the brownout threshold at 180 VAC;
• and
• if voltage level is not set within the memory:
• monitor input voltage;
• determine if the monitored input voltage is stable within a range from 90 VAC to 140 VAC;
• set the voltage level at 120 VAC within the memory and set the brownout threshold at 93 VAC if the monitored input voltage is determined to be stable within the range from 90 VAC to 140 VAC;
• and
• set the voltage level at 240 VAC within the memory and set the brownout threshold at 180 VAC if the monitored input voltage is not determined to be stable within the range from 90 VAC to 140 VAC.