Overview
The Allen-Bradley W61 overload relay heater is a thermal protection element designed for Bulletin 500 line starters and overload relay applications. Built with eutectic alloy construction and featuring Type W design, it provides Class 20 operation ideal for general industrial motor protection. This heater element is essential for maintaining reliable motor control in legacy and modern NEMA-style automation installations.
Key Features
- Eutectic alloy thermal protection with Type W design for Bulletin 500 line starters
- Class 20 operation recommended for general applications
- Compatible with Bulletin 509 starters, 592 overload relays, and similar NEMA-style motor protection configurations
- Interchangeable with other W-series heater elements based on motor full-load amperage
- Quick thermal response for motor overload protection
- Compact, drop-in design for existing starter assemblies
Technical Specifications
- Heater Type: Type W, Eutectic Alloy
- Trip Class: Class 20
- Application: Bulletin 500 Line Starters
- Full Load Amps (FLA) Range: Size 00–0 (22.2A), Size 1 (22.9A), Size 2 (23.2A), Size 3 (25.1A)
- Mounting: Direct plug-in to overload relay base
- Industry Standard: NEMA-compliant
- Condition: New in Box
Typical Applications
- Motor starter assemblies in industrial automation control
- Bulletin 500 three-phase motor protection circuits
- NEMA-rated motor control centers and distribution panels
- Legacy and retrofit electrical control systems requiring Class 20 protection
- General-purpose industrial machinery and pump drives
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line starters
- Allen-Bradley Bulletin 509 motor starters
- Allen-Bradley 592 overload relay bases
- NEMA-standard three-phase motor protection circuits
- Rockwell Automation legacy motor control applications
Replaces / Drop-In Replacement For
- Original W61 heater elements in Bulletin 500 starters
- Other thermal overload heater elements rated for equivalent amperage ranges
- Earlier-generation NEMA-style motor protection heaters
Works With
- Bulletin 500 motor starter contactors
- Type W heater selection tables (FLA-based selection required)
- Standard NEMA three-phase motor circuits
- Overload relay bases compatible with eutectic alloy heaters
