Overview
The Allen-Bradley W56 thermal overload relay heater element is a precision-engineered component for NEMA motor control and protection. This Type W heater element delivers Class 20 trip characteristics for eutectic alloy-type overload relays used in Bulletin 500 line starters. It is commonly installed in magnetic motor starters and contactor assemblies to provide reliable thermal overload protection in industrial automation systems.
Key Features
- Eutectic alloy construction for predictable, repeatable thermal response
- Class 20 trip protection suitable for general-purpose industrial applications
- Type W heater element for Bulletin 500 line starters and contactors
- Current ratings: 14.6 A (Size 00–0), 15.0 A (Size 1), 15.1 A (Size 2)
- Manual reset design for safety and control
- Compact, drop-in replacement design
Technical Specifications
- Heater Element Type: Type W, Eutectic Alloy
- Trip Class: Class 20
- Application: Bulletin 500 Line Starters, Motor Control
- Rated Current (Size 00–0): 14.6 Amps
- Rated Current (Size 1): 15.0 Amps
- Rated Current (Size 2): 15.1 Amps
- Reset Type: Manual
- Standard: NEMA / KC
- Weight: 0.04–0.05 lb
- Manufacturer: Rockwell Automation / Allen-Bradley
Typical Applications
The W56 heater element is commonly used in:
- AC magnetic motor starters and contactors
- Thermal overload relay assemblies for motor protection
- General-purpose industrial motor control circuits
- Fixed and variable-speed motor applications
- HVAC, pump, compressor, and fan motor circuits
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 Line Starters
- Rockwell Automation NEMA Motor Starters
- Standard AC magnetic motor contactors with eutectic overload relays
- Class 20 thermal overload relay assemblies
- NEMA-compliant motor control systems
Replaces / Drop-In Replacement For
The W56 is a direct replacement for OEM W56 heater elements in Bulletin 500 starters and equivalent NEMA motor starter applications. Always verify your specific starter model and application requirements before ordering. Consult your system integrator or technical manual to confirm proper part compatibility.
Works With
- AC power distribution systems (single and three-phase)
- NEMA-rated motor starter enclosures
- Manual and automatic motor control circuits
- Conventional relay logic and PLC-based control systems
- Standard motor overload protection schemas
