12S, 14S, 15S Sequencers and Time Delay Relays
Type 12S, 14S, and 15S series sequencers combine a solid state PTC (positive temperature coefficient) heater with bimetal disc actuated contacts to provide time-delayed electrical switching. The snap action design provides high- speed contact separation resulting in excellent life cycle characteristics at electrical loads up to 30 amps at 240VAC. The 12S is a single disc device (either one or two pole), the 14S uses two bimetal discs to provide two independent timings, and the 15S consists of one, two or three 12S and/or 14S controls mounted on a common baseplate. Typical applications include electric furnaces, gas unit heaters, and other applications where a time delay is required.