The Ametek Lamb 116456-50 is the 240-volt member of the single-stage, 5.7-inch thru-flow family, and it carries thermal protection built into the motor. It is bought by technicians servicing export-specification and overseas-mains equipment where the original motor was a single-stage thru-flow unit: shop vacuums, blowers, and OEM machines designed around airflow rather than deep sealed lift. Thermal protection is the feature worth noting - it gives the motor a defence against the overheating that kills thru-flow motors when a filter loads up.
Built for these use cases
- Single-stage replacement in 220 to 240 volt shop and utility vacuums
- Export-specification and OEM machines built for overseas mains
- Blower duty on 240-volt supply
- Applications where thermal protection is wanted against filter-restriction overheating
- Service depots stocking 240-volt single-stage spares
A thru-flow motor is cooled by the working air, so every cubic foot the machine pulls also passes across the armature and field. That makes for a compact, efficient and economical package on dry pickup, and it is why thru-flow motors dominate residential and light commercial vacuum production. It is also the reason they are the wrong choice for wet recovery: moisture, foam and cleaning solution carried in the airstream reach the windings directly.
Thermal protection matters more on a thru-flow motor than on a bypass motor, and the reason is structural. Because the working air is also the cooling air, anything that restricts the airflow - a loaded bag, a clogged filter, a blocked wand - simultaneously starves the motor of cooling. A thermal protector gives the motor a way to shut itself down before the armature is damaged, rather than relying on an operator to notice that suction has dropped.
Ametek Lamb part numbers are not interchangeable by diameter alone. Before ordering, pull the old motor and match four things: frame diameter, number of stages, discharge configuration and nameplate voltage. Two motors that share a body size can have completely different gasket surfaces, lead lengths and airflow paths, and a mismatch usually shows up as a motor that physically drops in but never reaches its rated suction.
We are not listing airflow, sealed-lift or wattage figures for this motor. No source we can verify publishes performance data for the 116456-50 suffix specifically. Figures circulating for the comparable 116668-50 are for a different part number and are not reproduced here. If you need verified numbers before ordering, contact us and we will pull the Ametek data for this exact suffix.
Specifications
- Manufacturer part number: 116456-50
- Frame diameter: 5.7 inches
- Blower stages: 1
- Cooling: Thru-flow
- Voltage: 240 V
- Thermal protection: Yes
- Published performance data: Not available for the -50 suffix from a verifiable source
- Air handled: Clean, dry, filtered air only
Frequently asked questions
Why does this listing not show CFM or watts?
Because no source we can verify publishes those figures for the 116456-50 suffix. Numbers circulating for similar single-stage 240-volt motors belong to other part numbers, and reprinting them here would be guessing at your machine's performance.
What does thermal protection do?
It shuts the motor down if it overheats. On a thru-flow motor, where cooling air and working air are the same air, a blocked filter or hose starves the cooling path, so a thermal protector is real insurance.
Can I use it for wet pickup?
No. Thru-flow motors should only see clean, dry, filtered air. Wet recovery calls for a bypass motor.
Will this work on 120 volts?
No. It is a 240-volt motor. Confirm the supply voltage stamped on the machine before ordering.
How do I confirm fitment?
Match the frame diameter, single-stage construction, thru-flow cooling and 240-volt rating against the motor you are removing, and read the part number off the old motor where it is still legible.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks the matching carbon brush kits, gaskets and mounting hardware alongside them. Our US-based team works with these motors every day across central vacuum systems, extractors, autoscrubbers and shop equipment, and can help you confirm frame size, stage count, discharge style and voltage against the motor already in your machine before you order.
