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McDonnell & Miller Series FS4-3 General Purpose Liquid Flow Switches
Mcdonnell & MillerFlow Switches

McDonnell & Miller Series FS4-3 General Purpose Liquid Flow Switches

McDonnell & Miller Flow Switches.

SKU 3G-OTH-02753

Also listed as: FS43 · FS4 3

Brand
Mcdonnell & Miller
Item
Series FS4-3 General Purpose Liquid Flow Switches
Part Number
FS4-3
Category
Flow Switches
Available to Order
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Mcdonnell & Miller Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

McDonnell & Miller Flow Switches.

Frequently Asked Questions

What is the McDonnell & Miller 3G-OTH-02753 flow switch used for?

The McDonnell & Miller 3G-OTH-02753 is a flow switch used in industrial piping systems to detect liquid flow or no-flow conditions. It is commonly applied in HVAC, boiler, and process control systems to activate alarms, pumps, or burners when flow starts or stops.

What are the specifications of the McDonnell & Miller 3G-OTH-02753?

The 3G-OTH-02753 features a 1-inch NPT connection, two electrical knock-outs for wiring from either end, and a sensitivity adjusting screw for easy flow adjustment. It has a single pole, double throw (SPDT) snap-action switch rated for general-purpose flow detection.

Where to buy the McDonnell & Miller 3G-OTH-02753 in Singapore?

You can source the McDonnell & Miller 3G-OTH-02753 flow switch through 3G Electric in Singapore. We handle logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this item.

How to install the McDonnell & Miller 3G-OTH-02753 flow switch?

Install the 3G-OTH-02753 in a horizontal pipe section with the flow arrow aligned to flow direction. Use the sensitivity adjusting screw to set the actuation point. Wire the SPDT switch through the knock-outs per your control circuit. Always follow local electrical 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 flow switches. 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
Siemens
Siemens
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
Siemens
Siemens
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
Siemens
Siemens
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
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
Siemens
Siemens
2-way flanged zone valve with spring return and normally closed operation. Features a 1 in flanged port connection and 24V AC/DC actuator voltage. Proportional signal control for modulating flow in HVAC and industrial fluid systems
Siemens
Siemens
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

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