Overview
The Allen-Bradley W63 thermal overload heater is a eutectic alloy heater element designed for Class 20 trip protection in Allen-Bradley Bulletin 500 line starters. Type W heater elements provide standard overload relay protection for general industrial applications, delivering predictable thermal response and reliable motor protection across a range of full-load amperage ratings.
Key Features
- Eutectic alloy construction for stable, repeatable thermal characteristics
- Class 20 trip protection—balances protection speed with acceptable nuisance-trip immunity for typical industrial motors
- Type W design compatible with Bulletin 500 motor starters
- Full-load amperage ratings from 25.5 to 33 amps (varies by motor starter size)
- Compact, drop-in heater element form factor
- Manual reset configuration
Technical Specifications
- Product Type: Heater Element (Eutectic Alloy Overload Relay)
- Heater Series: Type W, W Series
- Trip Class: Class 20
- Full-Load Amperage Range: 25.5–33 A (size-dependent)
- Motor Starter Size Coverage: Sizes 00–0 (FLA 28.0 A), Size 1 (FLA 28.3 A), Size 2 (FLA 28.5 A), Size 3 (FLA 30.5 A)
- Reset Type: Manual
- Material Composition: Eutectic Alloy
- Weight: 0.05 lbs
- Suitable For: Thermal overload relays, magnetic motor starters, motor control applications
- Condition: New in Box
Typical Applications
The W63 heater element is ideal for protecting AC induction motors in general industrial applications where Class 20 thermal protection is appropriate. Common uses include:
- Pump motor protection
- Fan and blower motor starters
- Compressor motor control
- Manufacturing machinery motor protection
- HVAC system motor starters
- General-purpose motor starter applications
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line starters and motor control centers
- NEMA-rated thermal overload relays
- Manual and magnetic motor starter frames (NEMA Sizes 00–3)
- Industrial motor control systems requiring Class 20 overload protection
Replaces / Drop-In Replacement For
The W63 heater element is a direct replacement for any thermal overload relay heater requiring Type W, Class 20 protection rated at 25.5–33 amps. Verify your existing heater’s amperage rating and motor starter size before ordering to ensure proper fit and protection characteristics.
Works With
- Bulletin 500 motor starters (Allen-Bradley standard line)
- Type W overload relay frames
- Manual and magnetic contactor-based motor control
- NEMA-compliant industrial automation equipment
