Overview
The Allen-Bradley W65 is a eutectic alloy-type thermal overload heater element for the Bulletin 500 line starter family. Engineered to deliver consistent, reliable motor overload protection, the W65 is Class 20 rated and compatible with magnetic motor starters, motor control centers, and thermal overload relays across multiple starter sizes.
Key Features
- Class 20 Protection: Trips in 20 seconds or less at 600% of rated current, meeting NEMA ICS 2-222 standards for general-purpose motor applications.
- Eutectic Alloy Design: Reliable thermal sensing element ensures repeatable trip performance and long service life.
- Wide Amperage Coverage: Single element rated 31–39.5 amps, compatible with starter Sizes 0–3 (32.5A @ Size 0, 32.0A @ Size 1, 33.0A @ Size 2, 36.5A @ Size 3).
- NEMA Certified: Meets North American electrical standards for overload protection in industrial motor control applications.
- Drop-In Replacement: Direct substitute for original Bulletin 500 line heater elements; manual reset design.
Technical Specifications
- Current Rating: 31–39.5 Amps (Class 20)
- Type: Type W, Eutectic Alloy Heater Element
- Trip Class: 20
- Reset Type: Manual
- Bulletin Series: Bulletin 500 Line Starters
- Weight: 0.04–0.05 lbs
- Certifications: NEMA-certified; KC standard
- Applications: Motor overload protection, thermal relay service
Typical Applications
The Allen-Bradley W65 is ideal for motor protection in:
- Industrial machinery and manufacturing automation
- HVAC and pump motor circuits
- General-purpose AC induction motor protection
- Motor control centers (MCCs) and panel-mounted starters
- OEM equipment builders requiring Bulletin 500 compatibility
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 Line magnetic starters (Sizes 0–3)
- NEMA-rated thermal overload relays
- AC motor starters and motor control circuits
- Standard three-phase induction motors with service factors ≥1.15
Replaces / Drop-In Replacement For
- OEM W65 heater elements in existing Bulletin 500 installations
- Original equipment manufacturer (OEM) equivalent thermal elements rated 31–39.5 amps
- Verify exact starter size and current requirement before ordering to ensure proper fit
Works With
- Bulletin 500 thermal overload relay assemblies
- Allen-Bradley Size 0, 1, 2, and 3 magnetic motor starters
- Standard three-phase AC motor circuits (208V, 230V, 460V, 575V)
- NEMA starter enclosures and motor control centers
