Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Image not available
DwyerAdjustable Set-Point Air Pressure Switches

Dwyer Pressure Switch: Adj, Auto Reset, 5 in wc to 44 in wc, Conduit Box, SPDT

The Dwyer 1823-40 is an adjustable set-point air pressure switch with auto reset, featuring a SPDT switch rated for 120 to 480V AC. It has an adjustable range of 5 in wc to 44 in wc and includes a conduit box with…

SKU 3G-OTH-69432

Also listed as: 182340 · 1823 40

Brand
Dwyer
Item
Pressure Switch: Adj, Auto Reset, 5 in wc to 44 in wc, Conduit Box, SPDT
Category
Adjustable Set-Point Air Pressure 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 — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Dwyer
Manufacturer Part Number
1823-40
Type
Auto Reset, 5 in wc to 44 in wc, Conduit Box, SPDT, NPT
AC
120 to 480V
Switch Voltage
120 to 480V AC

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 1823-40 is an adjustable set-point air pressure switch with auto reset, featuring a SPDT switch rated for 120 to 480V AC. It has an adjustable range of 5 in wc to 44 in wc and includes a conduit box with NPT connection.

Frequently Asked Questions

What is the Dwyer 1823-40 pressure switch used for?

The Dwyer 1823-40 adjustable set-point air pressure switch is used to monitor or control air pressure in HVAC, ventilation, and industrial process systems. It auto-resets and switches at a set point between 5 in wc and 44 in wc, with a SPDT contact rated for 120 to 480V AC.

What are the specifications of the Dwyer 1823-40 pressure switch?

The Dwyer 1823-40 is an adjustable auto-reset pressure switch with a range of 5 in wc to 44 in wc. It features a SPDT switch rated for 120 to 480V AC, a NPT connection, and a conduit box. The manufacturer part number is 1823-40.

Where to buy the Dwyer 1823-40 pressure switch worldwide?

3G Electric supplies the Dwyer 1823-40 pressure switch 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 adjustable set-point air pressure switch.

How to install the Dwyer 1823-40 pressure switch?

Install the Dwyer 1823-40 pressure switch by mounting it securely via the NPT connection in a dry location. Wire the SPDT contacts per your control circuit (120 to 480V AC). Adjust the set point between 5 in wc and 44 in wc using the adjustment screw. Always follow local electrical codes.

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 adjustable set-point air pressure 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
Pressure Switch: Adj, Auto Reset, 1.5 in wc to 5 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-5)
Dwyer
Pressure Switch: Adj, Auto Reset, 1.5 in wc to 5 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-5)
Pressure Switch: Adj, Auto Reset, 3 in wc to 22 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-20)
Dwyer
Pressure Switch: Adj, Auto Reset, 3 in wc to 22 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-20)
Dwyer
Dwyer
Pressure Switch: Adj, Auto Reset, 9 in wc to 85 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-80)
Pressure Switch: Adj, Auto Reset, 0.07 in wc to 0.22 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-00)
Dwyer
Pressure Switch: Adj, Auto Reset, 0.07 in wc to 0.22 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-00)
Pressure Switch: Adj, Auto Reset, 0.15 in wc to 0.5 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-0)
Dwyer
Pressure Switch: Adj, Auto Reset, 0.15 in wc to 0.5 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-0)
Pressure Switch: Adj, Auto Reset, 5 psi to 100 psi, Conduit Box, SPDT, NPT, 120/240V AC (MPN DA-7031-153-6)
Dwyer
Pressure Switch: Adj, Auto Reset, 5 psi to 100 psi, Conduit Box, SPDT, NPT, 120/240V AC (MPN DA-7031-153-6)

More from Dwyer

View all Dwyer parts
Manual Reset Pressure Switch: Adj, Manual Reset, 3 in wc to 11.75 in wc, SPDT, NPT, 1/8 in NPT (MPN 1900-10-MR)
Dwyer
Manual Reset Pressure Switch: Adj, Manual Reset, 3 in wc to 11.75 in wc, SPDT, NPT, 1/8 in NPT (MPN 1900-10-MR)
Differential Pressure Switch: Adj, 0.15 in wc to 0.5 in wc, SPDT, 1/8 in Sample Line Connection Size (MPN 1910-0)
Dwyer
Differential Pressure Switch: Adj, 0.15 in wc to 0.5 in wc, SPDT, 1/8 in Sample Line Connection Size (MPN 1910-0)
Pressure Switch: Adj, 5 psig to 150 psig, Conduit Box, SPST, NPT, 120V AC/240V AC/DC (MPN DA-31-2-7)
Dwyer
Pressure Switch: Adj, 5 psig to 150 psig, Conduit Box, SPST, NPT, 120V AC/240V AC/DC (MPN DA-31-2-7)
Pressure Switch: Adj, Auto Reset, 0.3 in wc to 1 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-1)
Dwyer
Pressure Switch: Adj, Auto Reset, 0.3 in wc to 1 in wc, Conduit Box, SPDT, NPT, 120 to 480V AC (MPN 1823-1)
Air Pressure Switch: Adj, Auto Reset, 0.8 in wc to 4 in wc, Std Housing, SPDT, Push-On, 250V AC (MPN ADPS-05-2-N)
Dwyer
Air Pressure Switch: Adj, Auto Reset, 0.8 in wc to 4 in wc, Std Housing, SPDT, Push-On, 250V AC (MPN ADPS-05-2-N)
Pressure Switch: Adj, 0.4 in wc to 1.6 in wc, SPDT, 1/8 in Sample Line Connection Size, NPT (MPN 1910-1)
Dwyer
Pressure Switch: Adj, 0.4 in wc to 1.6 in wc, SPDT, 1/8 in Sample Line Connection Size, NPT (MPN 1910-1)
Air Pressure Switch: Adj, Auto Reset, 0.2 in wc to 2 in wc, Std Housing, SPDT, Push-On, 250V AC (MPN ADPS-03-2-N)
Dwyer
Air Pressure Switch: Adj, Auto Reset, 0.2 in wc to 2 in wc, Std Housing, SPDT, Push-On, 250V AC (MPN ADPS-03-2-N)
Dwyer
Dwyer
Pressure Switch: Adj, Auto Reset, 5 psi to 150 psi, Conduit Box, SPDT, NPT, 120/240V AC (MPN DA-7031-153-7)