Description
Meet the A.O. Smith Century Motor 1.5 HP (B858) — a purpose-built pool motor designed to keep your water circulating smoothly and reliably. Built from the trusted Century/A.O. Smith lineage, this 1-speed, single-phase motor is a dependable replacement for a wide range of pool and spa pumps.
- Horsepower: 1.5 HP (total)
- Voltage & Phase: 115/230V, 1-Phase
- Amperage: 21.6A at 115V / 10.8A at 230V
- Speed: 1-Speed (1-Spd)
- Frame & Mount: 56Y frame with Square Flange
- Shaft: Threaded
- Capacitor: No capacitor mounted on top
- Motor Type: Pool motor
- Manufacturer: A.O. Smith / Century (US-Motors)
- Model: B858
This motor is specifically engineered to fit common pool pump configurations, making it a smart, long-lasting replacement for aging or underperforming units. Its square flange and 56Y frame are designed for secure mounting and compatibility with a broad range of pool pump housings, while the dual-voltage capability offers flexibility for different electrical setups.
What makes this Century motor stand out?
- Direct replacement value: A seamless upgrade path for OEMs and distributors who rely on Century/A.O. Smith components, reducing downtime and installation complexity.
- Proven durability: Century/A.O. Smith motors bring more than 75 years of industry experience, delivering dependable operation in chlorine and saltwater pool environments.
- Global support: Backed by Regal Beloit America’s extensive network, ensuring parts and service are readily available.
Ideal applications
- Residential or commercial pool pumps needing a reliable 1.5 HP, single-phase motor
- Spa circulation and jet systems that require a compact, single-speed, 56Y-frame motor
Installation and compatibility tips
- Verify your pump is compatible with a 56Y frame and square flange mounting for a straightforward swap.
- Choose 115V or 230V operation based on your electrical supply; motor current adapts to the voltage (21.6A @115V, 10.8A @230V).
- The motor does not mount a capacitor on top, so plan for a compatible external capacitor if your system requires one.
- Rely on a proven design from a brand with decades of pool industry experience, ensuring consistent performance and ease of replacement.
Shop with confidence—Bath & Spa Superstore has carried Century/A.O. Smith replacement motors since the early days of the pool and spa industry, offering authentic, specification-matched parts you can trust. If you need guidance on selecting the right model for your pool system, our experts are ready to help.
| Motor Type | Pool |
| Motor Amperage | 21.6A/10.8A |
| voltage | 115v/230v |
| Phase | 1 Phase (1ph) |
| Frame Type | 56Y |
| Speed | 1 Speed (1-Spd) |
| Horsepower | 1.5hp |
| Total Horsepower | 1.5thp |
| Motor Shaft Type | Threaded |
| Motor Style | Square Flange |
| Capacitor On Top | No |
| Manufacturer | US-Motors |
| WHY USE A.O. SMITH (AOS)/CENTURY PRODUCTS? |
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Regal Beloit America, Inc. (Century Electric Motors / A.O. Smith Electric Motors) is a leading supplier of electric motors for residential, commercial, and industrial applications. With operations in the United States, Mexico, China, and Europe, Regal Beloit America, Inc. has the ability to serve its customers electric motor needs on a global basis. We offer a comprehensive line of hermetic motors (used in air conditioning compressors), fractional horsepower A/C and D/C motors, and integral horsepower motors. We sell our products directly to original equipment manufacturers (OEMs), and replacement motors to HVAC and pool/pump distributors. |
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