Overview
The Allen-Bradley W46 is a eutectic alloy thermal overload heater designed for Class 20 motor protection in NEMA-style applications. This Type W heater element is part of Rockwell Automation’s legacy 500 Line series and serves as the heating element in thermal overload relays used across Bulletin 509 starters, Bulletin 592 overload relays, and similar magnetic motor starter assemblies. The W46 is selected based on motor full-load amp (FLA) rating and provides precise trip characteristics for motor branch circuit protection.
Key Features
- Type W eutectic alloy construction for reliable thermal response
- Class 20 trip protection—standard for general-purpose motor applications
- Suitable for Bulletin 500 Line starters and Bulletin 592 overload relays
- Compact heater element design for drop-in replacement installations
- New in box condition, ready for field deployment
- UL and NEMA listed for industrial control applications
Technical Specifications
- Heater Type: Type W, Eutectic Alloy
- Trip Class: Class 20
- Current Rating (Size 00–0): 5.82 A
- Current Rating (Size 1): 5.68 A
- Applicable Series: Bulletin 500 Line (Bulletin 509, 592)
- Standards: UL, NEMA
- Weight: 0.05 lbs
- Condition: New in Box
Typical Applications
The Allen-Bradley W46 is used in motor branch circuit protection for fractional to mid-range horsepower motors in industrial settings. Typical applications include:
- Magnetic motor starter overload relay assemblies
- Bulletin 509 NEMA combination starters
- Legacy 500 Line control systems in manufacturing facilities
- Pump, fan, and compressor motor protection
- General industrial automation and process control
Compatibility & Replacements
Compatible With
- Bulletin 509 NEMA Line Starters
- Bulletin 592 Overload Relays
- Bulletin 500 Line magnetic motor starters
- Standard NEMA-style thermal overload relay housings
Replaces / Drop-In Replacement For
The W46 is a direct replacement for original W46 heater elements in existing Bulletin 500 and NEMA starter assemblies. Verify compatibility with your system integrator before ordering to ensure proper motor FLA alignment with heater selection tables.
Works With
- Rockwell Automation legacy 500 Line control systems
- NEMA-rated motor control centers (MCCs)
- Standard industrial motor branch circuit distribution
- Any magnetic motor starter accepting Type W heater elements
