Overview
The Allen-Bradley W54 is a NEMA-standard thermal overload heater element engineered for use in Bulletin 500 line starters and thermal overload relays. As a Type W heater element with eutectic alloy construction, the W54 delivers Class 20 trip characteristics and consistent thermal protection across industrial motor control applications. This lot of 32 units provides maintenance teams and controls integrators with readily available spares for system uptime.
Key Features
- Type W Eutectic Alloy Design: Eutectic alloy type construction for Class 20 protection, standard for general-purpose motor applications
- Multi-Size Amperage Ratings: 12.2 AMP @ SIZE 00-0, 12.5 AMP @ SIZE 1, 12.6 AMP @ SIZE 2 allows precise matching to motor full-load current
- NEMA Compliance: NEMA overload relay heater element approved for standard industrial installations
- Bulletin 500 Compatibility: Designed for use with Bulletin 500 line starters and overload relays commonly found in legacy and modern facilities
- Lot of 32 Units: Bulk quantity ensures spare inventory and reduces downtime for emergency replacements
- Manual Reset Type: Manual reset type provides operator control of overload response
Technical Specifications
The W54 heater element meets all standard NEMA overload specifications for Bulletin 500 line starters:
- Part Number: W54
- Type: W Series Heater Element
- Overload Relay Type: Eutectic Alloy (Thermal)
- Trip Class: Class 20
- Reset Mechanism: Manual
- Amperage Range: 11.7–12.6 A (size-dependent)
- Standards: NEMA, Bulletin 500 Line
- Weight: 0.05 lbs per unit
- UPC: 781180154294
Typical Applications
Used for thermal overload relays, magnetic motor starters and motor controls across:
- AC induction motor protection (3-phase and single-phase)
- Motor control centers and motor starter cabinets
- Industrial machinery and equipment motor circuits
- Maintenance and spare-parts inventory for manufacturing facilities
- Legacy system refurbishment and component replacement
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line starters
- NEMA-standard thermal overload relays
- Magnetic motor starters with eutectic overload blocks
- Motor control centers (MCCs) using Type W heater elements
- General-purpose AC motor applications requiring Class 20 protection
Replaces / Drop-In Replacement For
- Original equipment heater elements in Bulletin 500 starter assemblies
- Worn or damaged Type W heater elements in existing overload relays
- Direct physical and electrical replacement for original W54 units
Works With
- Allen-Bradley motor control products and systems
- Standard NEMA overload relay sockets and mounting blocks
- Thermal protection schemes in industrial automation and motor control
- Manual reset overload relay logic for electrical interlocking and motor protection circuits
