We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

3G Electric
RFQ CartGet a QuoteSign inSign up
Dwyer AVFS-1 Airflow Switch, SPST, 30V DC/250V AC, PBT Housing, NEMA 4X - Airflow Switches
DwyerAirflow Switches

Dwyer AVFS-1 Airflow Switch, SPST, 30V DC/250V AC, PBT Housing, NEMA 4X

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

Also listed as: AVFS1 · AVFS 1

Brand
Dwyer
Item
AVFS-1 Airflow Switch, SPST, 30V DC/250V AC, PBT Housing, NEMA 4X
Category
Airflow Switches
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

Dwyer
Manufacturer Part Number
AVFS-1
NEMA Rating
4X
Contact Form
SPST
Input Voltage
30V DC/250V AC
Housing Material
PBT

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
This adjustable set-point air pressure switch has a range of 0.15 in wc to 0.5 in wc. It features a SPDT switch rated at 125V AC and a 1/8 in NPT sample line connection. Used for detecting low air pressure or flow changes in HVAC ducts, fume hoods, or filter monitoring systems
Dwyer
This adjustable set-point air pressure switch has a range of 0.15 in wc to 0.5 in wc. It features a SPDT switch rated at 125V AC and a 1/8 in NPT sample line connection. Used for detecting low air pressure or flow changes in HVAC ducts, fume hoods, or filter monitoring systems
Adjustable set-point air pressure switch with a range of 5 psig to 150 psig. Features a SPST switch rated for 240V AC/DC, housed in a conduit box with NPT connection. Suitable for HVAC, pneumatic systems, and process control applications requiring pressure monitoring and circuit activation at set points
Dwyer
Adjustable set-point air pressure switch with a range of 5 psig to 150 psig. Features a SPST switch rated for 240V AC/DC, housed in a conduit box with NPT connection. Suitable for HVAC, pneumatic systems, and process control applications requiring pressure monitoring and circuit activation at set points
Adjustable set-point air pressure switch with a range of 3 in wc to 11.75 in wc. Features a SPDT switch rated for 120 to 480V AC and a 1/8 in NPT sample line connection. Used for monitoring and controlling air pressure in HVAC, ventilation, and process control systems
Dwyer
Adjustable set-point air pressure switch with a range of 3 in wc to 11.75 in wc. Features a SPDT switch rated for 120 to 480V AC and a 1/8 in NPT sample line connection. Used for monitoring and controlling air pressure in HVAC, ventilation, and process control systems
Auto reset pressure switch with adjustable set-point range of 1.5 to 5 in wc. SPDT contacts rated for 120 to 480V AC. Housed in a conduit box with NPT connections. Suitable for monitoring or controlling air pressure in HVAC and ventilation systems
Dwyer
Auto reset pressure switch with adjustable set-point range of 1.5 to 5 in wc. SPDT contacts rated for 120 to 480V AC. Housed in a conduit box with NPT connections. Suitable for monitoring or controlling air pressure in HVAC and ventilation systems
This adjustable set-point air pressure switch from Dwyer features a SPDT switching element and a sample line connection size of 1/8 in NPT. It has an adjustable range of 4 to 20 inches of water column and operates at 120 to 480V AC. Commonly used in HVAC and industrial process systems to monitor or control air pressure
Dwyer
This adjustable set-point air pressure switch from Dwyer features a SPDT switching element and a sample line connection size of 1/8 in NPT. It has an adjustable range of 4 to 20 inches of water column and operates at 120 to 480V AC. Commonly used in HVAC and industrial process systems to monitor or control air pressure
Dwyer
Dwyer
Auto reset adjustable set-point air pressure switch with a range of 9 to 85 in wc. Features SPDT switch action, NPT connection, and a conduit box. Operates on 120 to 480V AC. Used in HVAC and air-handling systems for alarm, shutdown, or fan control

More from Dwyer

View all Dwyer parts →
The Dwyer AVFS-2 is a single-pole single-throw (SPST) air flow switch rated for 30V DC/250V AC at 3 A. It detects airflow from 197 fpm (horizontal minimum) to 1,969 fpm maximum. The PBT housing with NEMA 4X rating provides corrosion resistance. Typical applications include monitoring airflow in ducts or enclosures to prove fan operation or detect filter blockage in HVAC and ventilation systems
Dwyer
The Dwyer AVFS-2 is a single-pole single-throw (SPST) air flow switch rated for 30V DC/250V AC at 3 A. It detects airflow from 197 fpm (horizontal minimum) to 1,969 fpm maximum. The PBT housing with NEMA 4X rating provides corrosion resistance. Typical applications include monitoring airflow in ducts or enclosures to prove fan operation or detect filter blockage in HVAC and ventilation systems
SPDT airflow switch rated for 250V AC and 15A. Senses airflow from 200 fpm (horizontal orientation) up to 1,800 fpm maximum. ABS housing. Used in HVAC ducts, exhaust systems, and ventilation safety interlocks to prove airflow before enabling burners or fans
Dwyer
SPDT airflow switch rated for 250V AC and 15A. Senses airflow from 200 fpm (horizontal orientation) up to 1,800 fpm maximum. ABS housing. Used in HVAC ducts, exhaust systems, and ventilation safety interlocks to prove airflow before enabling burners or fans
The Dwyer DAFA-1 airflow switch operates on a 3V DC input voltage and is housed in ABS material. It is used to detect the presence or absence of air flow in HVAC ducts, ventilation systems, and industrial process applications, providing a switching signal for control or alarm functions
Dwyer
The Dwyer DAFA-1 airflow switch operates on a 3V DC input voltage and is housed in ABS material. It is used to detect the presence or absence of air flow in HVAC ducts, ventilation systems, and industrial process applications, providing a switching signal for control or alarm functions