479 East 186th Street Bronx, N.Y.  10458

Monday - Friday 7am-5pm  Saturday 8am-3pm

Price: $65.00

    Item #: S688A1007
    Availability: In stock
    Usually ships In 1-2 Business days
    In stock Quantity: 4


    The Sail Switch activates an electronic air cleaner, a humidifier, or other equipment in response to airflow from the system fan. The S688A is mounted in the return air duct where the sail will be in the direct path of an unrestricted air stream.


    • Simplified installations with multi-speed fans, inaccessible air handlers, fan motors with voltage or phase different from controlled equipment; eliminated wiring to system fan.
    • Polyester film sail mounted on a micro switch snap switch.
    • Removable spring counterbalances sail to allow mounting in either vertical (up or down) or horizontal air flow.
    • Top and bottom conduit knockouts for wiring convenience.
    • Low air velocity switch operation makes at 250 fpm and breaks at 75 fpm.

    Product Specifications

    Air Flow Switch
    Dimensions (in.)
    2 15/16 in. high x 3 3/4 in. wide x 2 in. deep; Sail Dimensions --5 in. wide (max), 26.2 sq. in. of area
    Dimensions (mm)
    59 mm high x 95 mm wide x 51 mm deep; Sail Dimensions --127 mm wide (max), 16,903 mm2
    Approvals, Underwriters Laboratories Inc.
    UL Listed: File No. E4436, Guide No. XAPX. For use in ambient temperatures normally prevailing in occupiable spaces, which usually are not higher than 77 F (25 C) but occasionally may be as high as 104 F (40 C) for brief periods.
    Approvals, Canadian Standards Association
    Insertion Length (in.)
    10 in.
    Insertion Length (mm)
    254 mm
    Ambient Temperature Range (F)
    At switches: 125 F Maximum; At sail: 170 F Maximum
    Ambient Temperature Range (C)
    At switches: 52C Maximum; At sail: 77 C Maximum
    Contact Ratings (AFL)
    N.O.Contacts: 2.0 A @ 24 Vac, 120 Vac; N.O.Contacts: 1.0 A @ 240 Vac; N.C.Contacts: 1.0 A @ 24 Vac, 120 Vac; N.C.Contacts: 0.5 A @ 240 Vac
    Contact Ratings (ALR)
    N.O.Contacts: 12.0 A @ 24 Vac, 120 Vac; N.O.Contacts: 6.0 A @ 240 Vac; N.C.Contacts: 6.0 A @ 24 Vac, 120 Vac; N.C.Contacts: 3.0 A @ 240 Vac
    Contact Ratings (resistive)
    N.O.Contacts: 5.0 A @ 24 Vac, 120 Vac; N.O.Contacts: 2.5 A @ 240 Vac; N.C.Contacts: 2.5 A @ 24 Vac, 120 Vac, 240 Vac
    Operating Velocity (fpm)
    75 fpm-250 fpm
    Operating Velocity (m/s)
    0.4 m/s-22.9 m/s