Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Mcdonnell & Miller Series 61 – Low Water Cut-Offs - Low Water Cut Offs
Mcdonnell & MillerLow Water Cut Offs

Mcdonnell & Miller Series 61 – Low Water Cut-Offs

McDonnell & Miller Low Water Cut Offs.

SKU 3G-OTH-02738

Brand
Mcdonnell & Miller
Item
Series 61 – Low Water Cut-Offs
Category
Low Water Cut Offs
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
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

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

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

McDonnell & Miller Low Water Cut Offs.

Frequently Asked Questions

What is the McDonnell & Miller 61 low water cut-off used for?

The McDonnell & Miller 61 low water cut-off is used in steam and hot water boilers to protect against low water conditions. It activates an alarm or electric water feeder when water level drops, preventing boiler damage and ensuring safe operation in commercial and industrial heating systems.

What are the specifications of the McDonnell & Miller 61 low water cut-off?

The McDonnell & Miller 61 features an adjustable BX outlet for easy installation and dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder. It is a packless design suitable for boiler applications. Contact 3G Electric for detailed technical specifications.

Where to buy the McDonnell & Miller 61 low water cut-off in Singapore?

You can source the McDonnell & Miller 61 low water cut-off from 3G Electric in Singapore. We supply industrial equipment and handle logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this model.

How to install the McDonnell & Miller 61 low water cut-off?

Install the McDonnell & Miller 61 low water cut-off according to the manufacturer's instructions. Mount it at the proper water level on the boiler, connect the adjustable BX outlet to the electrical supply, and wire the dual precision switches to the alarm or feeder. Always follow local codes and safety guidelines.

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 low water cut offs. 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

Compatible alternatives & equivalents

Cross-referenced by specification & description
Heavy Duty Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut-off and alarm or electric water
McDonnell & Miller
Heavy Duty Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut-off and alarm or electric water
Heavy duty Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut-off and alarm or electric water
McDonnell & Miller
Heavy duty Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut-off and alarm or electric water
120V/24V Models available Green LED indicates power On Red LED indicates Low Water Test button Meets requirements of ASME Standards CSD-1 No lock out with loss of
McDonnell & Miller
120V/24V Models available Green LED indicates power On Red LED indicates Low Water Test button Meets requirements of ASME Standards CSD-1 No lock out with loss of
Monel bellows provides corrosion resistance Single pole, single throw snap action switches Enclosed junction box protects switches Maximum pressure 50 psi (3.5
McDonnell & Miller
Monel bellows provides corrosion resistance Single pole, single throw snap action switches Enclosed junction box protects switches Maximum pressure 50 psi (3.5
Heavy duty Includes No. 2 switch Optional manual reset available Maximum boiler pressure 50 psi (3.5 kg/cm 2 ) Use with TC-4 on hot water systems
McDonnell & Miller
Heavy duty Includes No. 2 switch Optional manual reset available Maximum boiler pressure 50 psi (3.5 kg/cm 2 ) Use with TC-4 on hot water systems
Maintains consistent water level regardless of pressure Water column with integral tappings for gauge glass and tri-cock installations For boilers of any
McDonnell & Miller
Maintains consistent water level regardless of pressure Water column with integral tappings for gauge glass and tri-cock installations For boilers of any

More from McDonnell & Miller

View all McDonnell & Miller parts
Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5 years. Brass threads provide a metal-to-metal seal that
McDonnell & Miller
Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5 years. Brass threads provide a metal-to-metal seal that
Green power is on indicating LED Red low water indicating LED 30 second DOM Test button Self-Cleaning probe No lock out with loss of power if probe is in
McDonnell & Miller
Green power is on indicating LED Red low water indicating LED 30 second DOM Test button Self-Cleaning probe No lock out with loss of power if probe is in
The RB-24E low water cut-off offers several features: Brass threads provide a metal-to-metal seal that ensures a leak-free installation Integrated wrench flats
McDonnell & Miller
The RB-24E low water cut-off offers several features: Brass threads provide a metal-to-metal seal that ensures a leak-free installation Integrated wrench flats
Easy Field Configurable Control Patented Self-Cleaning Probe Tri-Function Button Condition Indicator Easy, Leak-Free Installation
McDonnell & Miller
Easy Field Configurable Control Patented Self-Cleaning Probe Tri-Function Button Condition Indicator Easy, Leak-Free Installation
For mounting in 21 2 NPT boiler side tappings Insertion lengths available in 13 16 41 8 (30-105mm) Packless
McDonnell & Miller
For mounting in 21 2 NPT boiler side tappings Insertion lengths available in 13 16 41 8 (30-105mm) Packless
Quick hook-up fittings provided Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy installation Dual precision switches for
McDonnell & Miller
Quick hook-up fittings provided Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy installation Dual precision switches for
21 2 NPT body tapping for side mounting on boilers Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy
McDonnell & Miller
21 2 NPT body tapping for side mounting on boilers Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy
The RB-24SE low water cut-off offers several features: Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5
McDonnell & Miller
The RB-24SE low water cut-off offers several features: Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5