Crydom EZ240D18 Solid State Relay 280Vrms 18A Max, 3-15VDC Control...

DC - Direct Current

AC - Alternating Current

compact - Carefuly designed to ensure an item has a minimal physical size

heavy - A concept of weight indicating an item may require some effort to lift or move

Compact - something that has a lot combined within a small space.

Voltage - A measurement of volts.

Solid - Something that is firm and not liquid, a hard shape that cannot be changed easily.

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