Overview
The Square D 8502SFO2S is a NEMA Size 4 magnetic contactor designed for reliable switching of three-phase AC loads in industrial automation systems. Class 8502 Type S contactors are engineered for general-purpose AC motor control where separate overload protection is provided. This contactor delivers dependable performance in HVAC systems, pump control, compressor circuits, and standard motor applications up to 600V AC.
Key Features
- Non-reversing magnetic contactor with Form S (separate control) coil configuration
- Open-style design without factory enclosure, suited for panel mounting or use in OEM control cabinets
- Three normally open (N.O.) main contacts rated for full-load switching
- UL listed and CSA certified for North American industrial use
- Replaceable coil available in multiple voltage options
- Compact footprint and proven reliability in retrofit and new installations
Technical Specifications
- Manufacturer: Square D by Schneider Electric
- NEMA Size: 4
- Class / Type: Class 8502 Type S
- Main Contacts: 3-pole, normally open (N.O.)
- Rated Voltage (Main): 600V AC
- Frequency: 50/60 Hz
- Horsepower Ratings @ 3-Phase: 40 HP (208V), 50 HP (230V), 75 HP (380V), 100 HP (480–575V)
- Enclosure Type: Open style (no enclosure)
- Control Form: Form S (separate control source)
- Series: A (indicating original production series)
- Certifications: UL 508, CSA
Typical Applications
- Three-phase AC motor control in industrial plants and facilities
- HVAC compressor and fan switching circuits
- Pump control systems and circulation loops
- Machine tool motor starters with external overload protection
- Heating and cooling load switching
- General industrial switching where reversing action is not required
Compatibility & Replacements
Compatible With
- Square D Class 8536 motor starters (when used as the contactor element)
- Standard 120V AC 50/60 Hz control voltage power supplies
- NEMA Type 1, 12, 3R, and 4 control enclosures
- Three-phase power distribution systems rated 600V AC and below
Replaces / Drop-In Replacement For
- Verify compatibility with your system integrator or OEM documentation before ordering as a replacement. Earlier or later series versions may have minor dimensional or electrical differences.
Works With
- Square D Class 9001 and 9007 thermal overload relay units
- Square D auxiliary contact kits and mechanical interlocks (Class 9999)
- Control transformers and 120V AC coil power sources
- Standard DIN rail and panel-mount infrastructure
