Overview
The Allen-Bradley W50 is a eutectic alloy overload heater element designed for use with thermal overload relays and magnetic motor starters in Bulletin 500 line equipment. With a current rating of 8.13-8.45 Amps, the W50 delivers Class 20 operation recommended for General Applications. This component ensures dependable motor protection against thermal overload conditions in industrial automation systems.
Key Features
- Type W thermal overload heater element suitable for use with thermal overload relays, magnetic motor starters and motor controls
- Operates under Class 20 protection standard utilizing eutectic alloy for the overload relay
- Specifically engineered for use with Bulletin 500 starters
- Manual reset design for operator control and safety verification
- Available in multiple full load amp ratings tailored to different sizes: Size 00 (8.07A–9.8A), Size 0 (7.33A–9.52A), and Size 1
- Industry-standard KC specification compliance for NEMA motor control
Technical Specifications
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model Number | W50 |
| Type | Heater Element, Type W |
| Heater Element Class | Eutectic Alloy |
| Current Rating | 8.13–8.45 Amps |
| Trip Class | Class 20 |
| Reset Type | Manual |
| Application Standard | Bulletin 500 Line Starters (NEMA) |
| UPC / GTIN | 781180154232 |
| Weight | 0.04 lb |
Typical Applications
- AC induction motor overload protection in general industrial settings
- Magnetic motor starter protection circuits
- Thermal overload relay replacement for Bulletin 500 equipment
- General-purpose motor control in manufacturing, HVAC, and material handling systems
- Maintenance and retrofit applications where Class 20 overload response is required
Compatibility & Replacements
Compatible With
- Bulletin 500 line thermal overload relays
- Bulletin 500 magnetic motor starters (Size 00, 0, 1, 2)
- Allen-Bradley / Rockwell Automation motor control systems
- NEMA-compliant motor starters
- Manual and electromechanical motor control circuits
Replaces / Drop-In Replacement For
The W50 is a replacement heater element designed to fit standard Bulletin 500 thermal overload relays. When replacing a worn or damaged heater element, verify the FLA (Full Load Amperage) rating matches your motor’s nameplate to ensure proper protection. Consult your thermal overload relay documentation or contact your system integrator for specific cross-reference information.
Works With
- Manual reset thermal overload relays
- Traditional magnetic motor starters (non-programmable)
- AC motor control circuits (single-phase and three-phase)
- NEMA Type 1, Type 4, Type 4X, and similar enclosure-rated starters
- General-purpose industrial motor applications up to Class 20 protection requirements
