Thermocouple & RTD Connectors Thermocouple & RTD Connectors HEATCON Thermocouple wire connectors are round pins for standard size & flat pins for mini instrumentation with a temperature controller.Thermocouple Connector design ideal for fast and easy connection of Thermocouple extension, compensating cable or thermocouple wire itself.Miniature ConnectorsStandard Size ConnectorsPanel Sockets for Standard Size Thermocouple PlugsHigh-Temperature Ceramic Connectors3-Pin Mini Connectors for RTD