Overview
The Allen-Bradley W46 overload heater element is a thermal protection unit engineered for motor control in industrial automation systems. This W Series, Type W heater is designed for use with Allen-Bradley Bulletin 500 line starters and magnetic motor overload relays. The W46 uses eutectic alloy technology to provide reliable Class 20 thermal trip protection, making it ideal for standard general-purpose motor applications where predictable overload response is required.
Key Features
- Type W heater element—eutectic alloy construction for consistent thermal response
- Class 20 protection—provides reliable overload relay operation for general applications
- Bulletin 500 Line compatibility—fits standard starter and relay assemblies
- Current rating: 5.46–5.64 amps (exact rating varies by starter size 0 or 1)
- Drop-in replacement—direct substitute in existing thermal overload relay assemblies
- Lightweight and compact—minimal footprint in control enclosures
Technical Specifications
The following specifications define the W46’s performance characteristics:
- Series: W
- Type: Heater Element
- Overload Relay Type: Eutectic Alloy Thermal
- Trip Class: Class 20 (10–20% overload trip time)
- Full Load Amperage (Size 00–0): 5.46 amps
- Full Load Amperage (Size 1): 5.64 amps
- Application: Bulletin 500 Line Starters
- Weight: 0.05 lbs
- Condition: New in Box
Typical Applications
The Allen-Bradley W46 is commonly deployed in:
- Three-phase motor starter assemblies and overload relay packages
- Magnetic motor control centers and distribution panels
- General-purpose industrial motors up to the specified amperage rating
- HVAC systems, pumps, and compressor motor protection
- Manufacturing equipment where standard overload protection is required
- Facilities performing maintenance or field replacement of faulty heater elements
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 Line magnetic starters
- Allen-Bradley Bulletin 509 overload relays
- Class 20 thermal overload relay assemblies
- Type W heater sockets in motor control equipment
- Size 00, 0, and Size 1 starter frames
Replaces / Drop-In Replacement For
The W46 directly replaces any faulty W46 heater element in existing thermal overload relay assemblies. Verify compatibility with your system integrator before ordering.
Works With
- NEMA-compliant magnetic motor starters
- Allen-Bradley overload relay packages and starter combinations
- Standard three-phase motor control circuits
- Manual and electrically controlled starter systems
