The Weil-Mclain 510350223 Plug-In Relay is a 24-volt device designed for use in heating, ventilation, and air conditioning systems. Manufactured by Weil-Mclain, this plug-in relay is specifically modelled to provide reliable and efficient control for HVAC and refrigeration systems. With its dependable brand reputation and precise design, this product ensures a seamless operation for various industrial and commercial applications.