We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
RFQ CartGet a QuoteSign inSign up
Dwyer Explosion Proof Air Flow Switc: Paddle, 3/4 in Female NPT For Pipe Size - Inline Hazardous-Location Switches for Liquids
DwyerInline Hazardous-Location Switches for Liquids

Dwyer Explosion Proof Air Flow Switc: Paddle, 3/4 in Female NPT For Pipe Size

The DWYER Explosion Proof Air Flow Switch: Paddle is an inline hazardous-location switch for liquids, model V4-2-U. It is designed for a 3/4 in Female NPT pipe size and features a brass construction with a 1 1/2 in…

SKU 3G-OTH-88799

Brand
Dwyer
Item
Explosion Proof Air Flow Switc: Paddle, 3/4 in Female NPT For Pipe Size
Category
Inline Hazardous-Location Switches for Liquids
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
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

Technical Specifications

Dwyer
Manufacturer Part Number
V4-2-U
Type
Brass
NPT
1 1/2 in
For Pipe Size
3/4 in Female NPT
Contact Rating (AC)
10 A @ 125/250V AC
Contact Rating (DC)
3 A @ 30V DC (Inductive)
Female NPT For Pipe Size
3/4 in
View Full Spec Sheet

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 Explosion Proof Air Flow Switch: Paddle is an inline hazardous-location switch for liquids, model V4-2-U. It is designed for a 3/4 in Female NPT pipe size and features a brass construction with a 1 1/2 in NPT connection. The switch offers a contact rating of 10 A @ 125/250V AC and 3 A @ 30V DC (Inductive).

Frequently Asked Questions

What is the Dwyer V4-2-U explosion proof air flow switch used for?

The Dwyer V4-2-U is an inline hazardous-location switch for liquids, designed to detect air flow in pipes. It is commonly used in industrial environments requiring explosion-proof protection, such as chemical plants or refineries, where reliable flow monitoring is critical for safety and process control.

What are the specifications of the Dwyer V4-2-U air flow switch?

The Dwyer V4-2-U has a brass body with a 1 1/2 in NPT connection and fits a 3/4 in Female NPT pipe size. Its contact rating is 10 A @ 125/250V AC and 3 A @ 30V DC (Inductive). This paddle-style switch is designed for hazardous locations and is manufactured by Dwyer.

Where to buy the Dwyer V4-2-U explosion proof air flow switch worldwide?

3G Electric supplies the Dwyer V4-2-U explosion proof air flow switch to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this model.

How to install the Dwyer V4-2-U paddle flow switch?

Install the Dwyer V4-2-U in a horizontal pipe section with the paddle oriented correctly for flow direction. Ensure the 3/4 in Female NPT pipe size matches your system and that the electrical connections comply with hazardous-location codes. Always follow the manufacturer's instructions for safe operation.

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 inline hazardous-location switches for liquids. 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 →

Similar products

Matched by specification & description
Dwyer
Dwyer
DWYER Flotect Flow Switch Brass: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1/2 in NPT (MPN V6EPB-B-S-LF). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V (MT Option).
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 1/4 in NPT, NPT (MPN V6EPB-B-S-4-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 25 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 1/4 in NPT, NPT (MPN V6EPB-B-S-4-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 25 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 2 in NPT, NPT (MPN V6EPB-B-S-6-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 29 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 2 in NPT, NPT (MPN V6EPB-B-S-6-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 29 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1/2 in NPT, NPT (MPN V6EPB-B-D-LF). Key specifications — Brand: DWYER; Contact Rating (DC): 4 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1/2 in NPT, NPT (MPN V6EPB-B-D-LF). Key specifications — Brand: DWYER; Contact Rating (DC): 4 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 1/4 in NPT, NPT (MPN V6EPB-B-S-4-B). Key specifications — Brand: DWYER; Contact Rating (DC): 24 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 1/4 in NPT, NPT (MPN V6EPB-B-S-4-B). Key specifications — Brand: DWYER; Contact Rating (DC): 24 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1/2 in NPT, NPT (MPN V6EPB-B-S-1-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 19 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1/2 in NPT, NPT (MPN V6EPB-B-S-1-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 19 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.

More from Dwyer

View all Dwyer parts →
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 3/4 in NPT, NPT (MPN V6EPB-B-D-2-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/2 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 3/4 in NPT, NPT (MPN V6EPB-B-D-2-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/2 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 3/4 in NPT, NPT (MPN V6EPB-B-D-2-B). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 3/4 in NPT, NPT (MPN V6EPB-B-D-2-B). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 in NPT, NPT (MPN V6EPB-B-S-3-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 23 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 in NPT, NPT (MPN V6EPB-B-S-3-MI). Key specifications — Brand: DWYER; Contact Rating (DC): 23 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, NPT (MPN V6EPS-S-S-LF). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, NPT (MPN V6EPS-S-S-LF). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, NPT (MPN V6EPS-S-S-1-S). Key specifications — Brand: DWYER; Contact Rating (DC): 40 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, NPT (MPN V6EPS-S-S-1-S). Key specifications — Brand: DWYER; Contact Rating (DC): 40 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 1/4 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, 2 in NPT (MPN V6EPS-S-S-6-S). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 3/8 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, 2 in NPT (MPN V6EPS-S-S-6-S). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 3/8 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 in NPT, NPT (MPN V6EPB-B-S-3-B). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Brass, 1 in NPT, NPT (MPN V6EPB-B-S-3-B). Key specifications — Brand: DWYER; Contact Rating (DC): 5 A Resistive @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 2 in; Hazardous Location Rating: Class I, Div 1 and 2, Group A, B, C, D; Contact Rating (AC): 5 A @ 125/250V.
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, 2 in NPT (MPN V6EPS-S-D-6-S). Key specifications — Brand: DWYER; Contact Rating (DC): 37 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 3/8 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.
Dwyer
DWYER Liquid Flow Switch: Paddle, 1/2 in/1/4 in/2 in/3/8 in For Pipe Size, Stainless Steel, 2 in NPT (MPN V6EPS-S-D-6-S). Key specifications — Brand: DWYER; Contact Rating (DC): 37 A (Inductive) @ 30V (CSA, ATEX and IECEx Models); For Pipe Size: 3/8 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 5 A @ 125/250V.