Overview
The Allen-Bradley W39 is a NEMA-compliant heater element for eutectic alloy thermal overload relays used in Bulletin 500 Line Starters. The W39 provides Type W heater elements for standard overload relay protection. This heater element is rated for 2.84 amps at Size 00-0 and 2.86 amps at Size 1, making it suitable for motors requiring Class 20 trip protection across a range of industrial applications.
Key Features
- Eutectic alloy type construction for accurate thermal sensing and protection
- Class 20 protection rating for general-purpose motor applications
- Manual reset type with NEMA certification
- Designed for use with Bulletin 500 motor starters and contactors
- Compact design with minimal weight (0.04 lbs)
- New in Box condition ensures reliable, uncompromised performance
Technical Specifications
Class 20 operation is recommended for general applications, while Class 10 or Class 30 relays may be required for specific applications.
Typical Applications
- General-purpose AC motor protection in industrial machinery
- Factory automation and production control systems
- HVAC and mechanical drive applications
- Panel-mount starter configurations requiring thermal overload sensing
- Replacement heater elements in existing Bulletin 500 installations
Compatibility & Replacements
Compatible With
- Bulletin 500 Line Starters and contactors
- Type W eutectic alloy overload relay assemblies
- 500-series motor control centers
- NEMA-compliant overload protection systems
Replaces / Drop-In Replacement For
- Original Allen-Bradley W39 heater elements
- Earlier revision W39 elements with identical amperage ratings
- Direct replacement in Bulletin 500 thermal units
Works With
- Allen-Bradley 500 series starters and contactors
- Manual or magnetic starter configurations
- Fixed-trip and adjustable overload relay assemblies
- Standard industrial control panels and enclosures
