Electric Fan/Heat Sequencer 24V, 1SPST & 2 DPST - NO, 1-160 seconds on, 1-160 seconds off. These sequencer are new, good quality and made by Napco USA Corp. #NS107 - H1-110- C1-110 - These sequencers are designed to delay motor rotation either at start up or after cut-off, allowing heating/cooling systerm to take advantage of the heating and/or cooling state in the system. Classified as SPST and DPST, they are widely used in air conditioning and heat pump systems. Features include: 24V, full load rated auxillary contacts, ON and OFF delay and individual packaging.