SSR20 is a safety relay with relay outputs, 3 NO + 1NC, and a +24 VDC supply voltage.SSR20 is used with two-hand devices.The reset function, automatic or manual, is set with a switch on the front.
Catalog description
Safety Relay Sentry SSR20 24VDC - 24 volt DC - 3 NO + 1 NC - No Time Delay