Overview
The Allen-Bradley W64 is a Type W thermal overload heater element engineered for use in NEMA-rated motor starters and thermal overload relays. Rated for 27.2–36.9 amps, this component provides critical motor protection by detecting overload conditions and triggering relay trips based on precise temperature characteristics. The W64 is compatible with Bulletin 500 line starters across multiple sizes (0–3), with full load amp ratings from 28.5–33.5 A depending on starter size, and uses eutectic alloy construction with manual reset capability.
Key Features
- Type W thermal overload heater element suitable for thermal overload relays, magnetic motor starters, and motor controls
- Trip Class 20 eutectic alloy design for reliable thermal response
- NEMA-rated overload relay heater element with proven field performance
- Manual reset type, allowing technicians to inspect conditions before restarting motors
- Compact, lightweight form factor enables easy installation in existing starter assemblies
Technical Specifications
The W64 delivers consistent thermal protection across standard industrial motor applications:
- Current Rating: 27.2–36.9 A
- Element Type: Type W, Eutectic Alloy
- Trip Class: 20
- Reset Type: Manual
- Standards: NEMA, KC certified
- Weight: 0.05 lb (22.7 g)
- UPC: 78118015469 (12-digit: 781180154690)
Typical Applications
The Allen-Bradley W64 protects motors and driven loads in industrial automation environments:
- Conveyor belt drives and material handling systems
- Pump and fan motor starters (NEMA Size 0–3)
- Manufacturing equipment with squirrel-cage induction motors
- Commercial HVAC and refrigeration motor control
- Process machinery requiring Trip Class 20 thermal protection
Compatibility & Replacements
Compatible With
- Bulletin 500 NEMA motor starters (Sizes 0, 1, 2, 3)
- Allen-Bradley thermal overload relay assemblies
- Magnetic motor starter contactors with eutectic overload protection
- Standard 3-phase AC squirrel-cage motor circuits
Replaces / Drop-In Replacement For
The W64 is directly interchangeable with OEM heating elements specified for 30.0–33.5 A protection ranges in Bulletin 500 starters. Always cross-reference motor full-load current (FLC) and ambient temperature conditions before substitution. Consult Rockwell Automation Bulletin 592 heater element selection tables for precise sizing.
Works With
- Bulletin 500 thermal overload relay assemblies
- Eutectic-type overload relay mechanisms (Trip Class 20)
- Manual or automatic starter resets
- Standard industrial control circuits rated for NEMA starters
