Compared to an electromechanical relay, this solid-state relay features no moving parts, which helps to offer fast response and long service life. It switches when an external voltage is applied across its control terminals. The solid-state design eliminates wear from moving parts, and it also does not feature arcing contacts that could potentially deteriorate. Additional Details ------------------------------ Product description: Compared to an electromechanical relay, this solid-state relay features no moving parts, which helps to offer fast response and long service life. It switches when an external voltage is applied across its control terminals. The solid-state design eliminates wear from moving parts, and it also does not feature arcing contacts that could potentially deteriorate.