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McDonnell & Miller FS6-1 Inline Flow Switch for Liquids, 1 in NPT, SPDT - Inline Switches for Liquids
McDonnell & MillerInline Switches for Liquids

McDonnell & Miller FS6-1 Inline Flow Switch for Liquids, 1 in NPT, SPDT

The MCDONNELL & MILLER Flow Switch (MPN FS6-1) is an inline switch for liquids designed for a 1 in pipe size with a 1 in NPT connection. It features a SPDT contact configuration and an AC contact rating of 44.4 A @…

SKU 3G-OTH-88546

Also listed as: FS61 · FS6 1

Brand
McDonnell & Miller
Item
FS6-1 Inline Flow Switch for Liquids, 1 in NPT, SPDT
Part Number
FS6-1
Category
Inline Switches for Liquids
Available to Order
Also known as:FS6-1McDonnell & Miller
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Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

McDonnell & Miller
Manufacturer Part Number
FS6-1
Type
NPT, SPDT
NPT
1 in
For Pipe Size
1 in
Connection Size
1 in
Contact Rating (AC)
44.4 A @ 120V (Locked Rotor)

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

Product Description

The MCDONNELL & MILLER Flow Switch (MPN FS6-1) is an inline switch for liquids designed for a 1 in pipe size with a 1 in NPT connection. It features a SPDT contact configuration and an AC contact rating of 44.4 A @ 120V (Locked Rotor).

Frequently Asked Questions

What is the MCDONNELL & MILLER FS6-1 flow switch used for?

The MCDONNELL & MILLER FS6-1 flow switch is used to detect liquid flow or no-flow conditions in piping systems. It is commonly applied in HVAC, boiler, and industrial process lines to interlock pumps, alarms, or burners when flow stops or starts.

What are the specifications of the MCDONNELL & MILLER FS6-1 flow switch?

The FS6-1 is an inline SPDT flow switch for liquids. It fits a 1 in pipe size with a 1 in NPT connection. Its AC contact rating is 44.4 A at 120V (locked rotor). The manufacturer part number is FS6-1, and it is made by MCDONNELL & MILLER.

Where to buy the MCDONNELL & MILLER FS6-1 flow switch worldwide?

3G Electric supplies the MCDONNELL & MILLER FS6-1 flow switch worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time.

How to install the MCDONNELL & MILLER FS6-1 flow switch?

Install the FS6-1 in a horizontal pipe section with the flow arrow aligned to flow direction. Use thread sealant on the 1 in NPT connection. Wire the SPDT contacts per your control circuit (44.4 A locked rotor max). Always follow local codes and the manufacturer's manual.

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
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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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