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McDonnell & Miller FS6-3/4 Inline Flow Switch for Liquids - Inline Switches for Liquids
McDonnell & MillerInline Switches for Liquids

McDonnell & Miller FS6-3/4 Inline Flow Switch for Liquids

The MCDONNELL & MILLER Flow Switch, model FS6-3/4, is an inline switch for liquids designed for 3/4 in pipe size with a 3/4 in NPT connection. It features a SPDT contact configuration and an AC contact rating of 7.4…

SKU 3G-OTH-88487

Also listed as: FS634 · FS6 3 4 · FS6-3-4

Brand
McDonnell & Miller
Item
FS6-3/4 Inline Flow Switch for Liquids
Part Number
FS6-3/4
Category
Inline Switches for Liquids
Available to Order
Also known as:FS6-3/4McDonnell & Miller
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
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Technical Specifications

McDonnell & Miller
Manufacturer Part Number
FS6-3/4
Type
NPT, SPDT
NPT
3/4 in
For Pipe Size
3/4 in
Connection Size
3/4 in
Contact Rating (AC)
7.4 A @ 120V (Full Load)

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3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MCDONNELL & MILLER Flow Switch, model FS6-3/4, is an inline switch for liquids designed for 3/4 in pipe size with a 3/4 in NPT connection. It features a SPDT contact configuration and an AC contact rating of 7.4 A at 120V full load.

Frequently Asked Questions

What is the McDonnell & Miller FS6-3/4 flow switch used for?

The McDonnell & Miller FS6-3/4 is an inline flow switch for liquids that detects flow or no-flow conditions in 3/4 in pipe systems. It is commonly used in HVAC, boiler, and industrial process applications to interlock pumps, alarms, or burners when flow is lost.

What are the specifications of the McDonnell & Miller FS6-3/4 flow switch?

The FS6-3/4 has a 3/4 in NPT connection, SPDT contact configuration, and an AC contact rating of 7.4 A at 120 V full load. It is designed for 3/4 in pipe size and is manufactured by McDonnell & Miller under part number FS6-3/4.

Where to buy the McDonnell & Miller FS6-3/4 flow switch worldwide?

3G Electric supplies the McDonnell & Miller FS6-3/4 flow switch to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this model.

How to install the McDonnell & Miller FS6-3/4 flow switch?

Install the FS6-3/4 in a horizontal pipe run with the flow arrow aligned to flow direction. Use thread sealant on the 3/4 in NPT connection and wire the SPDT contacts per your control circuit. Always follow local codes and the manufacturer's manual for safe operation.

Used in

Common applications for McDonnell & Miller
Boiler systems — McDonnell & Miller FS4-3T3-1 flow switch for low-water cutoff and pump protection in 1-inch piping.
Pump control — McDonnell & Miller FS8-W flow switch for detecting flow in 1-inch lines to prevent dry running.
HVAC cooling water — McDonnell & Miller FS6-3/4 flow switch for monitoring flow in 3/4-inch chilled water circuits.
Process piping — McDonnell & Miller FS5-3/4 brass flow switch for hot water applications up to 250°F.
Industrial liquid monitoring — McDonnell & Miller FS6-W-1 flow switch for 1-inch lines with high locked-rotor rating.
Small pipe systems — McDonnell & Miller FS-1 flow switch for 1/2-inch lines in liquid circuits requiring flow detection.
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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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Compatible alternatives & equivalents

Cross-referenced by specification & description
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2-way, spring return, normally closed zone valve with 1-1/4 in Union NPT connections. Operates on 24V AC floating signal. Suitable for regulating fluid flow in HVAC zone control applications
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Two-way, spring return, normally closed zone valve with 1 in Union NPT connections and 24V AC floating signal actuator. Used in hydronic HVAC systems to regulate fluid flow in heating or cooling zones
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2-way, spring return, normally closed zone valve with 3/4 in Union NPT connections and 24V AC/DC floating signal actuator. Used in HVAC systems for regulating fluid flow in piping networks
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2-way flanged zone valve with 1-1/4 in flanged port connection, 24V AC/DC actuator, spring return normally closed operation, and proportional signal control. Used in HVAC and industrial fluid systems for regulating water or glycol flow
Siemens
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This Siemens 2-way flanged zone valve features a 1/2 in flanged port connection and a 24V AC/DC actuator. It is spring return normally closed (NC) and accepts a proportional signal for modulating flow. Used in hydronic heating and cooling systems for zone control
Siemens
Siemens
This Siemens magnetic valve is a 2-way, spring return, normally closed (NC) valve with a floating signal. It features a 2 in Union NPT port connection and operates on 20 to 30V DC actuator voltage. Suitable for on/off or floating control in HVAC and industrial fluid systems, it provides fail-safe operation upon power loss

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