Overview
The Allen-Bradley W41 overload heater element is a eutectic alloy thermal heater designed to provide Class 20 overload protection in industrial motor control systems. This Type W heater element is the standard choice for Bulletin 500 line starters and is recommended for general-purpose motor protection applications. The W41 delivers reliable, predictable thermal response in thermal overload relays, magnetic motor starters, and full-voltage motor control systems.
Key Features
- Type W eutectic alloy construction for consistent thermal response
- Class 20 trip rating ideal for general motor protection applications
- Compatible with Bulletin 100, 500, 609, and 1200 line starters
- Manual reset type for controlled overload response
- Precise current ratings across multiple frame sizes (3.17–4.16A at Sizes 0/1)
- Proven reliability in NEMA-compliant motor control
Technical Specifications
- Part Number: W41
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Heater Type: Type W, Eutectic Alloy
- Trip Class: Class 20 Protection
- Full Load Amps (Size 0/1): 3.46–3.48A
- Ampere Rating Range: 3.17–4.16A (Sizes 0, 1, 00, 24A, 32A, 40A)
- Reset Type: Manual
- Ambient Temperature Rating: 40°C
- Weight: 0.51 lbs
- Material: Eutectic Alloy
- Applicable Standards: NEMA
Typical Applications
The W41 heater element is used in:
- Thermal overload relays in motor starter circuits
- Magnetic motor starters and contactors
- Full-voltage motor control systems
- General-purpose machine automation and industrial processes
- HVAC and pump applications requiring Class 20 overload protection
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line starters
- Allen-Bradley Bulletin 100, 609, and 1200 line starters
- Thermal overload relay assemblies rated for Type W heaters
- Magnetic motor starters and contactors with thermal overload protection
- Motor control centers (MCCs) using Bulletin 500 or compatible platforms
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The W41 is designed as a direct replacement for original Allen-Bradley W41 heater elements in existing Bulletin 500 thermal overload relays.
Works With
- NEMA motor control systems
- Class 20 trip-rated thermal overload relays
- Eutectic alloy overload protection circuits
- Manual reset thermal overload mechanisms
