Overview
The Allen-Bradley W29 is a eutectic alloy thermal overload heater element engineered for Bulletin 500 Line motor starters and overload relays. Rated for Class 20 operation with a full load amp rating of 1.07 amps for sizes 0 through 1, this Type W heater element provides dependable motor protection in general industrial applications. Class 20 operation is recommended for general applications, and the W29 is a standard replacement component for many motor control systems.
Key Features
- Eutectic Alloy Construction: Eutectic alloy heating element melts at precise temperature to trigger relay trip.
- Type W Specification: Type W heater elements for Bulletin 500 Line starters and overload relays ensure compatibility with standard Allen-Bradley motor control equipment.
- Class 20 Trip Rating: Class 20 overload relay will trip in 20 seconds or less at a current equal to 600 percent of its rating.
- Manual Reset Type: Manual reset provides positive control and operator feedback when overload condition clears.
- Broad Application Range: Used for thermal overload relays, magnetic motor starters and motor controls.
Technical Specifications
The W29 heater element meets NEMA standards for overload relay protection. Trip Class 20, eutectic overload relay with manual reset type. This heater is compatible with manual and full-voltage magnetic starters, and selection is determined by motor full-load amperage. For motors with different ambient temperatures at the starter and motor locations, temperature correction factors should be applied per Allen-Bradley selection procedures.
Typical Applications
- AC squirrel-cage induction motors in general industrial duty
- Magnetic motor starters and full-voltage controllers
- NEMA-compliant motor overload protection systems
- Applications where standard Class 20 trip time is adequate
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 Line motor starters
- Allen-Bradley thermal overload relays
- Magnetic motor starter control circuits
- NEMA Type W heater element applications
Replaces / Drop-In Replacement For
- Original equipment W29 heater elements in Bulletin 500 starters
- Direct replacement for existing W29 installations
Works With
- Class 20 thermal overload relay systems
- Eutectic alloy-based motor protection circuits
- Standard NEMA motor control devices
- Full-voltage AC motor starters
