Overview
The Allen-Bradley W52 thermal overload heater element is a eutectic alloy type protection device designed for Bulletin 500 line starters and motor controls. Each unit is rated for 9.9–10.3 amps and provides Class 20 overload protection, making it suitable for general industrial motor protection applications. This lot includes 34 individual heater elements, ensuring adequate stock for maintenance programs and system replacements.
Key Features
- Current Rating: 9.9–10.3 amps nominal, with size-specific amperage variations (10.1 A @ SIZE 00-0, 10.3 A @ SIZE 1, 10.4 A @ SIZE 2)
- Material: Eutectic alloy construction for precise thermal response and reliability
- Protection Class: Class 20 operation for standard motor protection scenarios
- Application: Direct replacement for thermal overload relays, magnetic motor starters, and motor control equipment
- Bulletin Compatibility: Bulletin 500 line starters and motor control systems
- Bulk Availability: Lot of 34 units provides efficient inventory management for maintenance and replacement programs
Technical Specifications
- Part Number: W52
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Product Type: Type W Heater Element
- Full Load Amp Rating: 9.9–10.3 amps
- Trip Class: Class 20
- Material: Eutectic Alloy
- Weight per Unit: 0.05 lbs
- Quantity per Lot: 34 units
- NEMA Rating: NEMA 1 enclosures
- Bulletin Family: Bulletin 500 Line Starters
Typical Applications
The W52 heater element is widely used in:
- Three-phase AC squirrel-cage motor protection systems
- Magnetic motor starters and contactor assemblies
- Thermal overload relay protection for motors ranging 1–5 hp at 460V (typical range)
- Industrial manufacturing and processing equipment
- HVAC and refrigeration motor control circuits
- General-duty motor protection where Class 20 operation meets application requirements
Compatibility & Replacements
Compatible With
- Bulletin 500 line motor starters and contactors
- Allen-Bradley Type W thermal overload relays
- Magnetic motor control equipment rated NEMA 1
- Motor protection circuits requiring Class 20 overload operation
- Standard three-phase AC motor control systems
Replaces / Drop-In Replacement For
- Original equipment W52 heater elements in Bulletin 500 starters
- Equivalent Type W eutectic alloy heater elements in similar current ratings
- Worn or damaged thermal overload elements in motor starter assemblies
Works With
- Bulletin 500 thermal overload relay platforms
- Magnetic motor starter control circuits
- Class 20 overload protection ecosystems
- Standard industrial AC motor control systems
- Legacy and modern Allen-Bradley motor control architectures
