McDonnell & Miller

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Paddle-type flow switch for liquids, installed inline in 1-inch pipe systems. Detects flow or no-flow conditions for pump protection, boiler low-water cutoff, and cooling water monitoring. Features 1-inch NPT connection and AC contact rating of 3.7 A at 240V full load.

McDonnell & Miller

McDonnell & Miller FS4-3T3-1 Inline Paddle Flow Switch for Liquids, 1 in NPT

BrandMcDonnell & Miller

CategoryInline Switches for Liquids

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Paddle-type insertion flow switch for liquids, suitable for pipe sizes from 1-1/4 in to 16 in. Brass body with 1-1/4 in NPT connection and SPDT switch rated 7.4 A full load at 120 VAC. Rated for hazardous locations Class I, Division 1 and 2, Groups C and D. Used to detect flow or no-flow conditions in industrial process, HVAC, and water treatment systems.

McDonnell & Miller

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

BrandMcDonnell & Miller

CategoryInsertion-Style Switches for Liquids

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McDonnell & Miller

McDonnell & Miller Steam Trap Float for Model 21

BrandMcDonnell & Miller

CategoryFloat & Thermostatic Repair Kits

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Paddle-type flow switch for liquid systems, installed inline in 1-inch pipes with a 1-inch BSP connection. Rated 7.4 A at 120V AC full load. Used to detect liquid flow in piping systems for process control or alarm activation.

McDonnell & Miller

McDonnell & Miller FS8-WJ Paddle Flow Switch, 1 in BSP, 7.4 A @ 120V AC

BrandMcDonnell & Miller

CategoryInline Switches for Liquids

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This inline flow switch detects liquid flow in 1/2 in pipe systems. It features a 1/2 in NPT connection and a SPDT switch with a contact rating of 22.2 A at 240V (locked rotor). Used in liquid circuits to signal flow or no-flow conditions.

McDonnell & Miller

McDonnell & Miller FS-1 Inline Flow Switch for Liquids

BrandMcDonnell & Miller

CategoryInline Switches for Liquids

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Paddle-type flow switch for liquids, with brass body and 1 1/4 in NPT connection. SPDT contacts rated 7.4 A at 120 V full load. For pipe sizes from 1 1/4 in to 16 in. Suitable for hazardous locations Class II, Div 1 and 2, Groups E, F, G.

McDonnell & Miller

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

BrandMcDonnell & Miller

CategoryInsertion-Style Switches for Liquids

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Inline flow switch for detecting liquid flow or no-flow conditions in piping systems. Features a 1 in NPT connection, SPDT contact configuration, and AC contact rating of 44.4 A at 120V (locked rotor). Suitable for use in HVAC, boiler, and industrial process lines to interlock pumps, alarms, or burners.

McDonnell & Miller

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

BrandMcDonnell & Miller

CategoryInline Switches for Liquids

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This insertion-style flow switch detects liquid flow or no-flow conditions in piping systems. It features a stainless steel body with a 1-inch NPT connection and an SPDT contact rated at 3.7 A at 240V AC full load. Suitable for use in HVAC, boiler, and industrial process lines to protect equipment from insufficient flow.

McDonnell & Miller

McDonnell & Miller FS4-3S Insertion-Style Flow Switch for Liquids

BrandMcDonnell & Miller

CategoryInsertion-Style Switches for Liquids

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Insertion-style paddle switch for liquid level detection in piping systems. Brass body with 1 in NPT connection, designed for 6 in pipe. AC contact rating 44.4 A at 120V (locked rotor). Suitable for general industrial flow or level sensing applications.

McDonnell & Miller

McDonnell & Miller FS251 Insertion-Style Paddle Switch for Liquids

BrandMcDonnell & Miller

CategoryInsertion-Style Switches for Liquids

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Paddle-type insertion flow switch for liquids, suitable for pipe sizes from 1-1/4 in to 16 in. Brass body with 1-1/4 in NPT connection and SPDT switch. Contact rating: 22.2 A at 240V (locked rotor). Used to detect flow or no-flow conditions in piping systems.

McDonnell & Miller

McDonnell & Miller FS7-4S Paddle-Type Insertion Flow Switch for Liquids

BrandMcDonnell & Miller

CategoryInsertion-Style Switches for Liquids

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Frequently asked questions

Common questions about McDonnell & Miller from 3G Electric.

Does 3G Electric supply McDonnell & Miller products?

Yes — 3G Electric (S) Pte. Ltd. supplies McDonnell & Miller products. We stock the McDonnell & Miller catalog and supply genuine factory-original products with full manufacturer warranty and technical support.

What McDonnell & Miller products does 3G Electric stock?

McDonnell & Miller industrial equipment and spare parts for commercial and industrial applications.

Where can I buy McDonnell & Miller industrial equipment?

You can order McDonnell & Miller products directly from 3G Electric. Commonly ordered items dispatch quickly from in-stock inventory. For non-stocked models or custom configurations, typical lead time is 2–6 weeks direct from the McDonnell & Miller factory. Request a quote via our contact page for pricing and availability.