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McDonnell & Miller FS7-4E Insertion-Style Flow Switch for Liquids - Insertion-Style Switches for Liquids
McDonnell & MillerInsertion-Style Switches for Liquids

McDonnell & Miller FS7-4E Insertion-Style Flow Switch for Liquids

The MCDONNELL & MILLER FS7-4E is a paddle-type flow switch for liquids, designed for pipe sizes from 1 1/4 in to 16 in. It features a NEMA 7/9 enclosure and is rated for hazardous locations Class I, Div 1 and 2…

SKU 3G-OTH-93340

Also listed as: FS74E · FS7 4E

Brand
McDonnell & Miller
Item
FS7-4E Insertion-Style Flow Switch for Liquids
Part Number
FS7-4E
Category
Insertion-Style Switches for Liquids
Available to Order
Also known as:FS7-4EMcDonnell & Miller
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Technical specs
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

McDonnell & Miller
Manufacturer Part Number
FS7-4E
Type
1 1/4 in/16 in For Pipe Size, Brass, NPT, SPDT
NPT
1 1/4 in
For Pipe Size
16 in
Switch Enclosure
NEMA 7/9
Contact Rating (AC)
7.4 A @ 120V (Full Load)
Hazardous Location Rating
Class I, Div 1 and 2, Group C, D

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3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MCDONNELL & MILLER FS7-4E is a paddle-type flow switch for liquids, designed for pipe sizes from 1 1/4 in to 16 in. It features a NEMA 7/9 enclosure and is rated for hazardous locations Class I, Div 1 and 2, Group C, D. The switch has a SPDT contact with a full-load AC rating of 7.4 A @ 120V and a 1 1/4 in NPT connection.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the McDonnell & Miller FS7-4E flow switch used for?

The McDonnell & Miller FS7-4E is a paddle-type flow switch for liquids, used to detect flow or no-flow conditions in pipes from 1 1/4 in to 16 in. It is suitable for hazardous locations rated Class I, Div 1 and 2, Group C, D, such as oil refineries and chemical plants.

What are the specifications of the McDonnell & Miller FS7-4E?

The FS7-4E has a brass body with a 1 1/4 in NPT connection, a NEMA 7/9 enclosure, and a SPDT contact rated at 7.4 A full load at 120V AC. It is designed for pipe sizes up to 16 in and carries a hazardous location rating of Class I, Div 1 and 2, Group C, D.

Where to buy the McDonnell & Miller FS7-4E worldwide?

3G Electric supplies the McDonnell & Miller FS7-4E flow switch worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time; we source and deliver this item to any country.

How to install a McDonnell & Miller paddle flow switch?

Install the FS7-4E in a horizontal pipe with the paddle oriented against flow direction. Ensure the pipe is fully filled and the switch is wired per the SPDT diagram. For hazardous locations, follow Class I, Div 1, Group C, D wiring practices. Always consult the manufacturer's manual for torque and clearance.

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 insertion-style 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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