Overview
The Allen-Bradley W64 is a NEMA-compliant overload relay heater element engineered for thermal protection of AC motors in industrial motor control circuits. This Type W eutectic heater element is designed specifically for Bulletin 500 line starters and provides Class 20 trip performance—a standard for general-purpose motor applications where controlled overload response is essential.
Key Features
- Current Rating: 27.2–36.9 amps
- Trip Class: Class 20 operation for general applications
- Eutectic Alloy Design: Precise thermal response and repeatable trip performance
- Manual Reset Type: Standard manual reset for Bulletin 500 starters
- NEMA Standard: NEMA overload relay heater element rated and certified
- Compatible: Works with standard Bulletin 500 motor starters, magnetic contactors, and thermal overload relays
Technical Specifications
- Part Number: W64
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Current Rating Range: 27.2–36.9 amps
- Trip Class: 20 (600% overload = trip ≤ 20 seconds)
- Type: Heater Element (Eutectic Alloy)
- Reset Mode: Manual
- Bulletin Series: Bulletin 500 Line
- Standard: KC (NEMA)
- Product Category: Motor Control, Overload Heater Element
Typical Applications
The Allen-Bradley W64 is used for thermal overload relays, magnetic motor starters and motor controls. Common applications include:
- General-purpose 3-phase AC motor protection
- Squirrel-cage induction motor circuits
- Bulletin 500 line motor starter assemblies
- Compressor and pump motor circuits
- Machine tool and industrial equipment motor protection
- Environments requiring Class 20 overload response (20-second trip at 600% FLC)
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line motor starters (all sizes)
- Standard thermal overload relays with Type W heater element sockets
- NEMA-standard motor control circuits
- Magnetic motor starters with eutectic heater element receptacles
- Manual and magnetic motor controllers
Replaces / Drop-In Replacement For
The Allen-Bradley W64 directly replaces any previous W64 units. When selecting heater elements for existing installations, ensure the motor’s full-load amp (FLA) rating falls within the W64’s 27.2–36.9 amp range. Verify compatibility with your system integrator or installer before ordering to confirm proper sizing for your motor.
Works With
- Bulletin 500 motor starter controllers
- Type W eutectic overload relay assemblies
- Class 20 thermal overload protection circuits
- NEMA-standard motor control enclosures and panels
- Manual reset overload relay configurations
