Therm-O-Disc > Products > Bimetal Controls & Limits

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.

Features
  • Single pole, double pole, or single pole - double throw switching
  • Available with a variety of terminals and baseplates
  • Self-current limiting PTC heaters
On/Off Timings
  • 12S with 24VAC PTC : On 1-30 seconds; Off 40-80 seconds
  • 14S with 24VAC PTC: On 1-110 seconds; Off 1-110 seconds
  • 15S with 24VAC PTC: On 1-110 seconds; Off 1-110 seconds
  • See data sheet (Product Download Tab) for detailed timing information
Applications
  • Air Conditioning
Agency Ratings
  • UL /CSA
    • 240 VAC /30 amps maximum “combined” inductive /resistive load (7 amps FLA maximum)
  • See data sheet (Product Download Tab) for detailed ratings information