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Dwyer Air Flow Switch: SPST, 30V DC/250V AC, 3 A, 1,969 fpm Max - Airflow Switches
DwyerAirflow Switches

Dwyer Air Flow Switch: SPST, 30V DC/250V AC, 3 A, 1,969 fpm Max

The Dwyer AVFS-1 is an air flow switch with a single-pole, single-throw (SPST) contact form, rated for 30V DC/250V AC at 3 A. It features a PBT housing with a NEMA 4X rating and supports a maximum air velocity of…

SKU 3G-OTH-69285

Brand
Dwyer
Item
Air Flow Switch: SPST, 30V DC/250V AC, 3 A, 1,969 fpm Max
Category
Airflow Switches
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Technical Specifications

Dwyer
Manufacturer Part Number
AVFS-1
NEMA Rating
4X
Contact Form
SPST
Input Voltage
30V DC/250V AC
Housing Material
PBT
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Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Dwyer AVFS-1 is an air flow switch with a single-pole, single-throw (SPST) contact form, rated for 30V DC/250V AC at 3 A. It features a PBT housing with a NEMA 4X rating and supports a maximum air velocity of 1,969 fpm, with a minimum of 197 fpm in horizontal orientation.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the Dwyer AVFS-1 air flow switch used for?

The Dwyer AVFS-1 air flow switch detects airflow presence or loss in HVAC ducts, exhaust systems, and industrial ventilation. It activates or deactivates equipment like fans or alarms when air velocity falls below 197 fpm or exceeds 1,969 fpm, protecting processes and equipment.

What are the specifications of the Dwyer AVFS-1?

The Dwyer AVFS-1 is an SPST switch rated for 30V DC/250V AC at 3 A. It has a PBT housing with a NEMA 4X rating, suitable for washdown and corrosive environments. Minimum air velocity is 197 fpm horizontal; maximum is 1,969 fpm.

Where to buy the Dwyer AVFS-1 worldwide?

3G Electric supplies the Dwyer AVFS-1 air flow switch to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time; we source genuine Dwyer parts for global industrial applications.

How to install the Dwyer AVFS-1 air flow switch?

Mount the Dwyer AVFS-1 in a horizontal duct section with the paddle oriented into the airflow. Ensure the minimum air velocity of 197 fpm is met for reliable switching. Wire the SPST contacts per your control circuit voltage (30V DC or 250V AC max). Test operation before finalizing.

Used in

Common applications for Dwyer
Combustion air-filter monitoring — Magnehelic Series 2000 on burner air-intake filter banks
Clean-room and pharmaceutical pressurisation — Magnehelic / Capsuhelic differential-pressure gauges
HVAC fan-discharge static pressure — Mark II inclined-vertical manometers on AHU test points
Filter-blockage alarms — Photohelic Series 3000 combined gauge/switch on air-handling units
BMS-integrated pressure monitoring — Digihelic DH3 with 4–20 mA output for building management

Dwyer Products

3G Electric supplies Dwyer airflow switches. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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