Leeson 5 HP Single-Phase Air Compressor Motor, 145T Frame, 3450 RPM, 230V
Leeson catalog number 120554, a 5 HP single-phase compressor duty motor in a compact 145T frame. The reason 5 HP fits a frame this small is speed: it is a 2-pole motor turning 3450 RPM, not a 1750 RPM machine. High breakdown torque lets it restart a belt-driven compressor against head pressure, which is what separates a compressor duty motor from a general purpose one.
Key specifications
- Horsepower: 5 HP
- Speed: 3450 RPM (3600 RPM synchronous), 2 pole
- Phase and frequency: single phase, 60 Hz
- Frame: 145T, rigid base foot mount
- Voltage: 230V only, no 115V tap
- Full load amps: 20.8 A
- Service factor: 1.0
- Enclosure: ODP, open drip-proof
- Insulation class: F
- Duty: continuous, 40 C ambient
- Shaft: 7/8 in. diameter x 2.25 in. extension, keyed
- Efficiency: 82.5%, power factor 95
- Bearings: 6205 drive end, 6203 opposite drive end
- Protection: manual thermal protector, BRJ34DB
- Weight: 49 lb
- Leeson model number: P145K34DB1
Check the speed before you order
This motor runs 3450 RPM. It is not interchangeable with a 1750 RPM 5 HP compressor motor, and swapping one for the other without changing the pulley will drive your pump at roughly double its rated speed. Confirm the nameplate RPM on the motor you are replacing, and size the sheave to the pump manufacturer's rated pump RPM.
Typical applications
Replacement motor for belt-driven single-stage and two-stage reciprocating air compressors specified at 3450 RPM, and other definite-purpose single-phase drives in the 5 HP class. Note the 1.0 service factor: size the motor to the actual load rather than counting on overload headroom.
Leeson 120554 carries the compressor duty designation in Leeson's own outline drawing for the 145T drip-proof rigid base configuration. Supplied by AirComParts as part number J5022.
NOTE: Actual product may be different from pictured!
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