Tecmark (TDI) CSC1138 Sequencing Switch, Tecmark, Solenoid Activated, CSC1138All CSC & SSAS solenoid operated switches have been discontinued and are limited to stock on hand. There are no viable replacement options at this time. Please call to discuss control system replacement options. CSC Series Sequencing Switches They are solenoid activated and may have a 120v or 240v coil. The CSC series switches require a TBS 312 air switch for proper function. Sequencing is available with 3 or 4 snap switches rated at 25 amps each. † 3mm switches * Indicates available as a CSC model only- No SSAS version