Overview
The Allen-Bradley W55 is a thermal overload heater element engineered for dependable motor protection in industrial control systems. This eutectic alloy type overload relay element is rated for 12.8–13.8 amps and provides Class 20 protection for Bulletin 500 line starters. It is used for thermal overload relays, magnetic motor starters and motor controls. This heater element is a critical component that safeguards electrical systems against damaging overload conditions, ensuring uninterrupted machinery operation.
Key Features
- Eutectic alloy construction for reliable thermal protection
- Type W element compatible with Bulletin 500 line starters
- Rated for 12.8–13.8 amps full load current
- Class 20 trip protection for general industrial applications
- Lightweight, compact design (approximately 0.05 lbs)
- Drop-in replacement for existing W55 installations
Technical Specifications
The W55 heater element delivers precise thermal protection across multiple starter sizes. Specifications include 13.6 amps at size 00–0, 13.7 amps at size 1, and 13.8 amps at size 2. The eutectic alloy construction provides fast, reliable response to overcurrent conditions while minimizing nuisance trips during normal operation.
Typical Applications
- Motor starter overload protection in manufacturing facilities
- Pump and compressor motor control systems
- HVAC equipment motor protection
- General industrial machinery requiring Class 20 thermal protection
- Retrofit and replacement in existing Bulletin 500 installations
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line motor starters
- Type W thermal overload relay bases
- Magnetic motor starters and contactors
- NEMA sizes 00–0, 1, and 2
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The W55 element is a direct replacement for original equipment applications and previous W55 installations.
Works With
- Allen-Bradley overload relay assemblies
- Bulletin 500 motor control centers
- Standard industrial motor starter circuits
- Thermal protection relay systems
