We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
⌕
RFQ CartGet a QuoteSign inSign up
MCDONNELL & MILLER Liquid Flow Switch: 3/4 in For Pipe Size, Brass, 3/4 in NPT - Inline Switches for Liquids
McDonnell & MillerInline Switches for Liquids

MCDONNELL & MILLER Liquid Flow Switch: 3/4 in For Pipe Size, Brass, 3/4 in NPT

The MCDONNELL & MILLER FS5-3/4 is a brass inline liquid flow switch for 3/4 in pipe size with 3/4 in NPT connections. It has a contact rating of 22.2 A @ 240V (Locked Rotor) and operates in temperatures from 32°F to…

SKU 3G-OTH-88531

Brand
McDonnell & Miller
Item
Liquid Flow Switch: 3/4 in For Pipe Size, Brass, 3/4 in NPT
Category
Inline Switches for Liquids
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

McDonnell & Miller
Manufacturer Part Number
FS5-3/4
Type
Brass, NPT, 32°F to 250°F
NPT
3/4 in
For Pipe Size
3/4 in
Contact Rating (AC)
22.2 A @ 240V (Locked Rotor)
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Product Description

The MCDONNELL & MILLER FS5-3/4 is a brass inline liquid flow switch for 3/4 in pipe size with 3/4 in NPT connections. It has a contact rating of 22.2 A @ 240V (Locked Rotor) and operates in temperatures from 32°F to 250°F.

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

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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
MCDONNELL & MILLER Flow Switch: 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT, SPDT (MPN FS6-W-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT, SPDT (MPN FS6-W-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1-1/4 in; Contact Rating (AC): 44.4 A @ 120V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1-1/4 in; Contact Rating (AC): 44.4 A @ 120V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4S). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1-1/4 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4S). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1-1/4 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT (MPN FS4-3D). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT (MPN FS4-3D). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4W). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1-1/4 in; Hazardous Location Rating: Class I, Div 1 and 2, Group C, D; Contact Rating (AC): 7.4 A @ 120V (Full Load).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4W). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1-1/4 in; Hazardous Location Rating: Class I, Div 1 and 2, Group C, D; Contact Rating (AC): 7.4 A @ 120V (Full Load).
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4SW). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 16 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 7.4 A @ 120V (Full Load).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 1/4 in/16 in For Pipe Size, Brass, 1 1/4 in NPT, NPT, SPDT (MPN FS7-4SW). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 16 in; Hazardous Location Rating: Class II, Div 1 and 2, Group E, F, G; Contact Rating (AC): 7.4 A @ 120V (Full Load).

More from McDonnell & Miller

View all McDonnell & Miller parts →
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in BSP, 1 in Connection Size, BSP (MPN FS8-WJ). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 7.4 A @ 120V (Full Load).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in BSP, 1 in Connection Size, BSP (MPN FS8-WJ). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 7.4 A @ 120V (Full Load).
MCDONNELL & MILLER Flow Switch: 1/2 in For Pipe Size, 1/2 in NPT, 1/2 in Connection Size, NPT, SPDT (MPN FS-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1/2 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: 1/2 in For Pipe Size, 1/2 in NPT, 1/2 in Connection Size, NPT, SPDT (MPN FS-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1/2 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT, SPDT (MPN FS6-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 44.4 A @ 120V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT, SPDT (MPN FS6-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 44.4 A @ 120V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: 1 in For Pipe Size, Brass, 1 in NPT, 1 in Connection Size, NPT, SPDT (MPN FS5-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: 1 in For Pipe Size, Brass, 1 in NPT, 1 in Connection Size, NPT, SPDT (MPN FS5-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: 3/4 in For Pipe Size, 3/4 in NPT, 3/4 in Connection Size, NPT, SPDT (MPN FS6-3/4). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 3/4 in; Contact Rating (AC): 7.4 A @ 120V (Full Load).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: 3/4 in For Pipe Size, 3/4 in NPT, 3/4 in Connection Size, NPT, SPDT (MPN FS6-3/4). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 3/4 in; Contact Rating (AC): 7.4 A @ 120V (Full Load).
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT (MPN FS8-W). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT (MPN FS8-W). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 22.2 A @ 240V (Locked Rotor).
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT (MPN FS4-3T3-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 3.7 A @ 240V (Full Load).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: Paddle, 1 in For Pipe Size, 1 in NPT, 1 in Connection Size, NPT (MPN FS4-3T3-1). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 1 in; Contact Rating (AC): 3.7 A @ 240V (Full Load).
MCDONNELL & MILLER Flow Switch: 3/4 in For Pipe Size, 3/4 in NPT, 3/4 in Connection Size, NPT, SPDT (MPN FS6-W-3/4). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 3/4 in; Contact Rating (AC): 3.7 A @ 240V (Full Load).
McDonnell & Miller
MCDONNELL & MILLER Flow Switch: 3/4 in For Pipe Size, 3/4 in NPT, 3/4 in Connection Size, NPT, SPDT (MPN FS6-W-3/4). Key specifications — Brand: MCDONNELL & MILLER; For Pipe Size: 3/4 in; Contact Rating (AC): 3.7 A @ 240V (Full Load).