DPST Relay Models Enclosed with a Transformer Capable of Powering External Loads up to 35VA. Ideal for use on Boilers without Domestic Coil. Equally Adaptable for Zoned and Unzoned Systems • Low voltage screw terminals — 3 color coded, end stripped line voltage leads. • Internal transformer can power up to 35VA external loads. • Mounts to 4”x 4” junction box. • Dustproof steel case.