Overview
The Allen-Bradley W44 overload relay heater element is a precision-engineered component designed for Class 20 thermal protection in industrial motor control systems. Built with eutectic alloy construction, this W44 heater element provides consistent, reliable tripping characteristics suitable for motor starters, magnetic contactors, and overload relays in Bulletin 500 line applications.
Key Features
- Class 20 trip curve—trips in 20 seconds or less at 600% of rated current
- Eutectic alloy construction for stable, repeatable thermal characteristics
- Rated for 4.46 amps maximum continuous current
- Manual reset design for controlled motor restart
- Compatible with Bulletin 500 line starters and standard NEMA motor controls
- Type W series meets KC standards for overload protection
Technical Specifications
The W44 is designed to integrate seamlessly into existing thermal overload relay systems. Its compact heater element format ensures drop-in compatibility with standard overload relay frames.
Typical Applications
- Thermal overload relays in magnetic motor starters
- NEMA motor control centers (MCCs)
- Bulletin 500 line starter protection
- Industrial automation systems requiring Class 20 thermal protection
- Equipment rated 4–5 amp continuous service
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line starters and overload relays
- NEMA standard thermal overload relay frames
- Magnetic motor starters with eutectic-type heater pockets
- Industrial motor control centers (MCCs)
- Multi-speed motor starter assemblies
Replaces / Drop-In Replacement For
The W44 serves as the direct replacement for W44-rated positions in existing Bulletin 500 line overload relay applications. Verify heater element selection by referencing Allen-Bradley overload relay selection tables based on motor full-load amperage and ambient temperature conditions.
Works With
- Class 20 overload relay trip curves (NEMA standard)
- Eutectic-type thermal overload relay systems
- Manual reset overload relay frames
- Standard NEMA motor control platforms
