S637A1004 | Honeywell Sail Switch 1" × 3" Metal Sail

Honeywell · Relays, Contactors & Switches

Description  The Honeywell S637A1004 is a line-voltage sail switch designed to sense air velocity in warm air ducts and ventilation systems. It uses a metal sail that actuates a SPDT snap switch, completing burner or fan control circuits only when sufficient airflow is present.     Technical Specifications  Condition New/Never Used Surplus Brand Honeywell Category HVAC Controls Part Number S637A1004 Subcategory Sail Switch Switch Type SPDT snap switch Sail Dimensions 1" × 3" (trim-to-fit option) Insertion Length 3-1/2" Voltage Rating 120 VAC / 240 VAC / 24 VAC Contact Ratings 8A @ 120VAC; 5A @ 240VAC; 2A @ 24VAC; 15A @ 6VDC; 7.5A @ 12VDC Temperature Rating Up to 150°F (65°C) maximum ambient Differential Adjustment Manual via knurled knob on snap switch Conduit Knockouts One on each end of the housing for wiring convenience Housing Dimensions 2-15/16" H × 3-3/4" W × 2" D Function Airflow detection and safety interlock Mounting Type Duct-mount, insertion type Application Blowers, fans, crop dryers, and warm air systems Weight 0.99 lbs   Information About S637A1004 The S637A1004 is part of Honeywell’s reliable line of airflow detection devices designed for HVAC and industrial heating systems. This sail switch responds to air movement by operating an internal SPDT snap switch, ensuring that a burner or fan circuit is energized only when airflow reaches a predetermined level. It is commonly used in heating ducts, crop dryers, and ventilation systems to prevent burner operation without sufficient air movement. The unit includes a 1" × 3" metal sail that can be trimmed to adjust sensitivity, a manually adjustable differential for fine-tuning, and conduit knockouts for flexible wiring options. Key Features SPDT Snap Switch Mechanism: Provides precise airflow actuation with reliable contact operation in HVAC and industrial control systems. Trim-to-Fit Metal Sail: 1" × 3" sail can be reduced to half size, increasing the airflow velocity required to activate the switch. Manual Differential Adjustment: Equipped with a knurled knob for fine-tuning the actuation differential to match system conditions. Versatile Electrical Ratings: Supports multiple voltage configurations—120V, 240V, and 24V—for use in various line or low-voltage control circuits. Temperature Resistant Design: Operates in ambient temperatures up to 150°F, making it suitable for high-temperature air ducts and heating systems. Durable Construction: Compact metal housing with conduit knockouts on both ends for easy wiring and installation flexibility. Reliable Airflow Detection: Ensures burners or fans activate only when proper air velocity is achieved, enhancing safety and efficiency. Compact Installation Profile: Shallow housing and 3-1/2" insertion length allow installation in tight or narrow duct spaces. The S637A1004 delivers the reliability and precision required for airflow monitoring and safety interlock functions in HVAC and agricultural drying systems.

Brand: Honeywell · Category: Relays, Contactors & Switches

Key features

• SPDT Snap Switch Mechanism: Provides precise airflow actuation with reliable contact operation in HVAC and industrial control systems.
• Trim-to-Fit Metal Sail: 1" × 3" sail can be reduced to half size, increasing the airflow velocity required to activate the switch.
• Manual Differential Adjustment: Equipped with a knurled knob for fine-tuning the actuation differential to match system conditions.
• Versatile Electrical Ratings: Supports multiple voltage configurations—120V, 240V, and 24V—for use in various line or low-voltage control circuits.
• Temperature Resistant Design: Operates in ambient temperatures up to 150°F, making it suitable for high-temperature air ducts and heating systems.
• Durable Construction: Compact metal housing with conduit knockouts on both ends for easy wiring and installation flexibility.
• Reliable Airflow Detection: Ensures burners or fans activate only when proper air velocity is achieved, enhancing safety and efficiency.
• Compact Installation Profile: Shallow housing and 3-1/2" insertion length allow installation in tight or narrow duct spaces.

Specifications

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