Overview
The Allen-Bradley W53 overload heater element is a precision thermal protection component designed for NEMA motor starter overload relays. As a Type W eutectic alloy heater element, it delivers Class 20 trip characteristics and is the standard choice for general-purpose applications in Bulletin 500 line starters. This element provides reliable motor protection by responding proportionally to motor current, tripping the starter when thermal limits are exceeded.
Key Features
- Eutectic Alloy Construction: Precision thermal characteristics for consistent, repeatable trip performance
- Class 20 Trip Rating: Standard protection class recommended for general industrial applications
- Type W Design: Compatible with Bulletin 500 line overload relays and magnetic motor starters
- 10.7–11.4 Amp Rating: Suitable for motors with full load current in this range across multiple starter sizes (00–2)
- Manual Reset: Operator-controlled reset enhances safety and diagnostics
- New in Box Condition: Factory sealed, ready for immediate installation
Technical Specifications
| Parameter | Value |
| Part Number | W53 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Type | Type W Eutectic Alloy Heater Element |
| Trip Class | Class 20 |
| Current Rating | 10.7–11.4 amps |
| Compatible Starter Sizes | 00–0, 1, 2 |
| Reset Type | Manual |
| Application | Bulletin 500 Line Starters, NEMA Overload Relays |
| Condition | New in Box |
Typical Applications
The W53 heater element is used in a wide range of industrial motor control scenarios:
- General-purpose AC motor protection in machine tools and production equipment
- HVAC system motor starters and blower controls
- Pump and compressor motor overload protection
- Industrial conveyor and material handling systems
- Process automation and control panel motor circuits
- OEM motor control integration and system upgrades
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 Line Starters
- NEMA-rated thermal overload relays
- Magnetic motor starters with integral overload protection
- Motor control systems requiring Class 20 thermal protection
- Full load amp ranges: 10.7–11.4 amps across starter sizes 00–0, 1, and 2
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator or controls engineer before ordering to ensure correct heater element selection for your specific motor and starter configuration. Heater elements are amperage-critical components; installation of the wrong rating may compromise motor protection or cause nuisance trips.
Works With
- Allen-Bradley overload relay models (Bulletin 500 series)
- NEMA-standard motor starter control circuits
- Standard 3-phase and single-phase motor control systems
- Industrial PLC and automation systems with hardwired motor protection
