Overview
The Allen-Bradley W53 thermal overload relay heater element is an industry-standard eutectic alloy heater designed for Bulletin 500 line starters and NEMA motor control applications. This Type W heater provides Class 20 trip protection and is recommended for general industrial applications requiring reliable motor overload protection across multiple motor sizes.
Key Features
- Eutectic Alloy Construction: Precision-engineered thermal element for accurate trip characteristics and consistent performance across ambient temperature variations.
- Class 20 Trip Rating: Provides reliable Class 20 overload protection, meeting NEMA standards for industrial motor control.
- Bulletin 500 Compatible: Designed specifically for Allen-Bradley Bulletin 500 line starters, Bulletin 509 starters, and Bulletin 592 overload relay assemblies.
- Manual Reset: Manual reset design ensures controlled restart after overload condition, preventing unintended automatic restarts.
- Versatile Sizing: W53 covers full-load amp ratings suitable for multiple motor sizes (Sizes 00, 0, 1, and 2), making it a go-to heater element in many OEM and retrofit applications.
Technical Specifications
- Trip Class: 20
- Element Type: Eutectic Alloy (Type W)
- Reset Type: Manual
- Bulletin Compatibility: 500 Line, 509, 592
- Standards: NEMA-compliant
- Application: General Purpose Industrial Motor Control
Typical Applications
- Bulletin 500 and Bulletin 509 motor starter assemblies
- Bulletin 592 overload relay units
- General-purpose three-phase AC motor circuits (fractional to medium horsepower)
- Machine tool and industrial equipment motor protection
- OEM motor control panel assemblies
- Plant retrofit and replacement heater installations
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line starters
- Allen-Bradley Bulletin 509 starters
- Allen-Bradley Bulletin 592 overload relay assemblies
- NEMA-standard motor control circuits and panels
- Legacy Rockwell Automation motor protection systems
Replaces / Drop-In Replacement For
- Original equipment W53 heater elements in existing Bulletin 500/509 assemblies
- Other Type W eutectic overload heaters rated for equivalent full-load amps
Works With
- Three-phase AC induction motors
- Manual motor starters and soft-starters (where heater element is the protection device)
- Thermal overload relay logic circuits
- Industrial plant motor control systems
