S688 - Sail Switch Switch
The Caloritech™ S688 Sail Switch is used to activate electrical equipment in response to airflow in a duct. Both normally open and normally closed contacts (SPDT) are provided with a 2.5 Amp 240 VAC maximum resistive rating. The normally open contact makes at 250 fpm (1.3 m/s) and breaks below 75 fpm (0.4 m/s). The S688 can be adapted to horizontal or vertical air flow.