3 SPST On/Off Switches in Parellel The Atlas Connector is a panel with three on-off switches for track sections (blocks) or accessories. It has three SPST (single-pole, single-pole) on-off switches in parallel. Use to control power to sidings, accessories, etc. Can be coupled together in any number. The connector has threaded screw hole terminals to accept 3-48 screws and Spade Tongue Solderless Connectors. Contacts are housed in a molded styrene housing that canbe directly connected to other Atlas Connectors. Includes mounting holes in the housing.