Check the listing for details. Aube Technologies RC840T-240 On/Off Switching Electric Heating Relay. Color: Black, Condition: Used. Listed at 49.99 USD. This Aube Technologies RC840T-240 On/Off Switching Electric Heating Relay with Built-in Thermostat is a high-quality connector that is perfect for any home improvement project. Its rectangular shape and black color make it a great addition to any drywall construction or building & hardware setup. The metal frame material ensures durability and longevity, while the built-in thermostat allows for easy temperature control. With this connector, you can easily switch on and off your heating system without any hassle. It is designed for use with electric heating systems and has a capacity of 240 amps. The brand name Aube Technologies is synonymous with quality and reliability, making this connector a great choice for any home or business.