Overview
The Dayton 3M505B is a robust single-phase AC motor designed for fan-duty and general-purpose applications in commercial and light industrial settings. This 1/2HP motor at 115V operates at 1075RPM with a rated current draw of 7.1A, delivering consistent performance in HVAC systems, circulation fans, and similar equipment. The motor features a totally enclosed air-over (TEAO) enclosure that protects internal components from airborne contaminants while allowing thermal management through forced-air convection.
Key Features
- Permanent Split Capacitor (PSC) Design — smooth starting and operation without switching contacts
- TEAO Enclosure — robust protection against dust and debris in demanding environments
- Frame 48Y — compact, industry-standard mounting footprint for easy retrofits
- Ring/Stud Mount — flexible installation options for vertical and horizontal mounting
- 5/8″ Shaft — standard coupling and pulley compatibility
- Nameplate-rated 1075RPM — reliable fan-speed performance at 60Hz operation
Technical Specifications
- Horsepower: 1/2 HP
- Voltage: 115V, single-phase, 60Hz
- Full-Load Current: 7.1A (nominal)
- Rotational Speed: 1075 RPM (2-speed capable nameplate)
- Motor Design: Permanent Split Capacitor (PSC)
- Enclosure Type: TEAO (Totally Enclosed Air Over)
- Frame Size: 48Y
- Shaft Diameter: 5/8″
- Shaft Extension: 2.5″
- Mounting: Ring/Stud Mount
- Weight: Approximately 5 lbs
Typical Applications
The Dayton 3M505B excels in HVAC applications including pedestal fans, circulation fans, and condenser fan motors. Its PSC design makes it ideal for continuous-duty fan operation without complex control circuits. The 115V single-phase rating suits residential and light commercial installations where three-phase power is unavailable. The motor’s thermal overload protection and compact 48Y frame allow straightforward mounting in replacement scenarios.
Compatibility & Replacements
Compatible With
- Standard 115V single-phase 60Hz electrical systems
- Pedestal fan assemblies and mounting bases
- Capacitor-start or permanent split capacitor fan applications
- Ring-mount and stud-mount fan frames
- 5/8″ shaft coupling and pulley systems
Replaces / Drop-In Replacement For
The Dayton 3M505B can replace other 48Y-frame, 1/2HP, 115V single-phase motors with matching speed ratings and PSC design. Verify mounting pattern, shaft diameter, and capacitor specifications with your system integrator before ordering, as variations in shaft extension and capacitor requirements may apply across similar part numbers.
Works With
- Standard run capacitors (verify µF rating on motor nameplate)
- Thermal overload switches and motor protectors
- Variable-frequency drives (VFDs) — verify motor suitability; PSC motors may not be ideal for all VFD applications
- Standard electrical wiring per NEC guidelines
