MCDONNELL & MILLER Low Water Cut-Off, 120V
SKU 3G-OTH-77737
Need installation or engineering help?
Ask a question
Frequently Asked Questions
What is the MCDONNELL & MILLER RB-122E low water cut-off used for?
The RB-122E is a residential low water cut-off that protects hot water boilers from damage caused by low water conditions. It automatically shuts down the burner when water level drops, preventing overheating and potential system failure in hydronic heating applications.
What are the specifications of the MCDONNELL & MILLER RB-122E?
The RB-122E is a low water cut-off with a 120V power supply, designed for residential hot water boilers. It is manufactured by McDonnell & Miller under part number RB-122E and is a direct replacement for compatible systems requiring float-type level sensing.
Where to buy the MCDONNELL & MILLER RB-122E worldwide?
3G Electric supplies the McDonnell & Miller RB-122E low water cut-off to customers worldwide. As a global industrial sourcing partner, we handle logistics, customs clearance, and delivery to your location. Contact us for a quote and lead time on this replacement part.
How to install the MCDONNELL & MILLER RB-122E low water cut-off?
Installation typically requires mounting the RB-122E on the boiler supply line above the water line, wiring the 120V control circuit to the burner safety circuit, and verifying proper float operation. Always follow the manufacturer's instructions and local codes for safe boiler operation.
Used in
Common applications for MCDONNELLMCDONNELL Products
3G Electric supplies MCDONNELL replacement hvacr pumps, valves & tubing. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
