Multi-voltage contactors and controls and related methods

1. 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.

2. The relay switch control of claim 1 , wherein the relay switch control is configured to be selectively operable with:

a 24 VAC coil when wires of the 24 VAC coil are connected to the first terminal and the common terminal; and

a line voltage coil when wires of the line voltage coil are connected to the second terminal and the common terminal.

3. The relay switch control of claim 1 , wherein the control circuit includes a fuse coupled with and/or in the first terminal that is configured to protect against miswiring.

4. The relay switch control of claim 1 , further comprising an AC/DC power supply configured to be operable with inputs ranging from 98 VAC to 276 VAC inputs.

5. The relay switch control of claim 1 , wherein the relay switch is a part of a contactor that is configured to be selectively interchangeable with:

an AC contactor operable on 24 VAC;

a refrigeration contactor having 120 VAC, 208 VAC, 240 VAC, or 250 VAC coils; and

a non-compressor contactor having 24 VAC, 120 VAC, 208 VAC, 240 VAC, or 250 VAC coils.

6. The relay switch control of claim 1 , wherein the relay switch is a part of a contactor, and the contactor comprises a cover or door movable relative to the first terminal and the second terminal, such that only one of the first terminal or the second terminal is available for connection at a given time.

7. The relay switch control of claim 1 , wherein the relay switch is a part of a contactor, and the contactor comprises a cover or door movable relative to the first terminal and the second terminal between at least:

a first position in which the first terminal is exposed and available for connection, and the cover or door is disposed over the second terminal and inhibits connection to the second terminal; and

a second position in which the second terminal is exposed and available for connection, and the cover or door is disposed over the first terminal and inhibits connection to the first terminal.

8. The relay switch control of claim 1 , wherein the relay switch is a part of a multi-voltage contactor that is configured to accept activation inputs ranging from 98 VAC to 276 VAC inputs and/or wherein the multi-voltage contactor is configured to accept 120, 208, 240, 250, and 24 VAC inputs and to switch loads of the same or different voltage.

9. The relay switch control of claim 1 , wherein the relay switch control is configured for connection with one or more components of an HVAC system or other compression based cooling system.