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MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size - Inline Switches for Liquids
McDonnell & MillerInline Switches for Liquids

MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size

The MCDONNELL & MILLER FS4-3T3-1 is a paddle-type flow switch for liquids, designed for inline installation in 1-inch pipe systems. It features a 1-inch NPT connection and an AC contact rating of 3.7 A at 240V full load.

SKU 3G-OTH-88606

Also listed as: FS43T31 · FS4 3T3 1

Brand
McDonnell & Miller
Item
Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size
Category
Inline Switches for Liquids
Available to Order
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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

McDonnell & Miller
Manufacturer Part Number
FS4-3T3-1
Type
NPT
NPT
1 in
For Pipe Size
1 in
Connection Size
1 in
Contact Rating (AC)
3.7 A @ 240V (Full Load)

Technical Documents

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McDonnell & Miller Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MCDONNELL & MILLER FS4-3T3-1 is a paddle-type flow switch for liquids, designed for inline installation in 1-inch pipe systems. It features a 1-inch NPT connection and an AC contact rating of 3.7 A at 240V full load.

Frequently Asked Questions

What is the McDonnell & Miller FS4-3T3-1 flow switch used for?

The McDonnell & Miller FS4-3T3-1 is a paddle-type flow switch for liquids, used to detect flow or no-flow conditions in 1-inch pipe systems. Common applications include pump protection, boiler low-water cutoff, and cooling water monitoring in industrial HVAC, process, and power generation systems.

What are the specifications of the McDonnell & Miller FS4-3T3-1?

The FS4-3T3-1 is a 1-inch NPT inline paddle flow switch for liquids. It has a 1-inch pipe size, 1-inch NPT connection, and an AC contact rating of 3.7 A at 240V full load. The manufacturer part number is FS4-3T3-1, and it is designed for 1-inch pipe systems.

Where to buy the McDonnell & Miller FS4-3T3-1 worldwide?

3G Electric supplies the McDonnell & Miller FS4-3T3-1 flow switch to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on this genuine McDonnell & Miller part.

How to install a McDonnell & Miller FS4-3T3-1 paddle flow switch?

Install the FS4-3T3-1 in a horizontal pipe section with the paddle oriented against flow direction. Use thread sealant on the 1-inch NPT connection and ensure the pipe is fully drained before installation. Wire the switch per the contact rating (3.7 A at 240V AC) and test for proper actuation at desired flow rate.

Used in

Common applications for McDonnell & Miller
Steam boiler low-water cutoff — McDonnell & Miller inline flow switches (e.g., FS-1) for automatic burner shutdown
Cooling water flow monitoring — McDonnell & Miller insertion-style switches (e.g., FS4-3D) in large-diameter pipes
Hazardous-area process lines — McDonnell & Miller FS7-4E with NEMA 7/9 enclosure for Class I, Div 1 locations
HVAC chilled water systems — McDonnell & Miller FS6-1 inline switch for pump flow verification
Industrial wastewater treatment — McDonnell & Miller FS4-3S stainless steel switch for corrosive fluid flow detection
Boiler feedwater control — McDonnell & Miller FS8-WJ with BSP connections for international installations

McDonnell & Miller Products

3G Electric supplies McDonnell & Miller inline switches for liquids. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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