Overview
The Allen-Bradley W61 overload relay heater element is a precision thermal protection component for industrial motor control and automation systems. This eutectic alloy heater element is engineered for use with Bulletin 500 line starters and provides Class 20 trip protection characteristic, making it ideal for general industrial applications requiring reliable overload protection.
Key Features
- Eutectic Alloy Type: Advanced alloy construction for consistent thermal response and long service life
- Class 20 Trip Class: Provides Class 20 protection per NEMA standards for general-purpose motor applications
- Manual Reset: Simple manual reset mechanism for quick system reset after overcurrent trip
- Bulletin 500 Compatible: Direct fit for Allen-Bradley Bulletin 500 line starters and magnetic motor starters
- Versatile Sizing: Available for multiple starter sizes (00–0, 1, 2, 3) with FLA ratings from 22.2 to 25.1 amps
Technical Specifications
- Part Number: W61
- Type: Heater Element / Overload Thermal Unit
- Heater Class: Type W, W-Series
- Trip Class: Class 20
- Overload Type: Eutectic Alloy
- Reset Type: Manual
- Size 00–0 FLA Rating: 22.2 amps
- Size 1 FLA Rating: 22.9 amps
- Size 2 FLA Rating: 23.2 amps
- Size 3 FLA Rating: 25.1 amps
- Standard: KC (NEMA certified)
- Brand: Allen-Bradley / Rockwell Automation
- Weight: 0.03 lb (approximately)
- Condition: New in Box
Typical Applications
- Three-phase AC induction motor protection in industrial machinery
- Magnetic motor starters and motor control centers (MCCs)
- Pump, fan, and compressor motor overload protection
- General industrial automation and control systems
- OEM equipment requiring NEMA-rated overload protection
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 Line Starters
- Magnetic Motor Starters (NEMA rated)
- Thermal Overload Relays using Type W heater elements
- Industrial Control Systems requiring Class 20 protection
Replaces / Drop-In Replacement For
- Original OEM W61 heater elements in Bulletin 500 starters
- Direct replacement for worn or failed W61 elements
- Verify specific starter frame size (00–0, 1, 2, or 3) before ordering to ensure proper FLA rating match
Works With
- Rockwell Automation / Allen-Bradley motor control systems
- NEMA-rated thermal overload relay assemblies
- Standard industrial 3-phase AC motor circuits
- Manual and automatic reset relay configurations
