
Quick overview
- Full rated 1 HP A full rated motor, 1.0 HP output with a 1.4 total horsepower rating.
- Keyed shaft A 5/8 inch keyed shaft rather than a threaded one, so it drives the impeller through a key.
- Dual voltage Wired for 115 or 230 volts, drawing 7.2 or 14.4 amps at service factor.
- CX C-face frame A 56C frame with a C-face and no base, the CX style square flange mounting.
- Permanent split capacitor A switchless PSC design, so there is no start switch to stick or burn.
- Built for outdoor duty Open dripproof enclosure, continuous duty, automatic thermal protection and a 50 deg C ambient rating.
Similar products
Other products people compare with this one.
Product details
The Century B122 is a Centurion full rated pool and spa pump motor rated 1 HP at 3450 RPM. It is a CX-Type motor on a 56C C-face frame with no base, wired for 115 or 230 volts, and it turns counterclockwise viewed from the pump end.
Full rated, and what the numbers mean
Full rated means the motor makes its nameplate horsepower on its own, so the 1.0 HP rating is real output rather than a number that leans on the service factor. With a 1.40 service factor the total horsepower comes out at 1.4 THP. Current draw is 7.2 amps at 230 V or 14.4 amps at 115 V at service factor, single phase, 60 Hz.
Keyed shaft
The shaft is 5/8 inch in diameter with a keyway and a 2-1/16 inch extension, so this motor belongs on pumps built for a keyed drive rather than a threaded one. Overall length is 11.89 inches. Measure the shaft on the motor you are replacing before you order, because keyed and threaded shafts are not interchangeable.
Construction
It is a permanent split capacitor design with no start switch, in an open dripproof enclosure with an aluminum flange, rated for continuous duty at ambient temperatures up to 50 deg C with class B insulation and automatic thermal protection.
| Brand | Century |
|---|---|
| Manufacturer part number | B122 |
| UPC | 663001192657 |
| Series | Centurion full rated pool and spa pump motor, CX-Type |
| Motor design | Permanent split capacitor, single or dual voltage |
| Horsepower | 1 HP, 1.4 THP |
| Speed | 3450 RPM, 1 speed |
| Voltage | 115/230 V |
| Current | 7.2/14.4 A at service factor |
| Frequency and phase | 60 Hz, 1 phase |
| Frame | 56C, C-face, no base |
| Enclosure | Open dripproof |
| Service factor | 1.40 |
| Shaft | Keyed, 5/8 inch diameter |
| Shaft length | 2-1/16 inch |
| Overall length | 11.89 inch |
| Rotation | Counterclockwise pump end |
| Shipping weight | 25.25 lb |
| Ships | Parcel |
Request a quote
Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.
Customer reviews
Questions and answers
What people ask about this product, answered by our pool techs.

















