Overview
The Allen-Bradley W45 is a thermal overload relay heater element designed for use in Bulletin 500 line starters and motor control circuits. This Type W, eutectic alloy heater provides Class 20 protection—tripping in 20 seconds or less at 600% of rated current—making it ideal for general-purpose motor protection applications where reliable overtemperature sensing is essential.
Key Features
- Eutectic Alloy Construction — Consistent thermal response for dependable overload sensing and motor protection
- Class 20 Trip Rating — Precise, repeatable trip characteristics for predictable motor protection
- Type W Heater Element — Standard for Allen-Bradley Bulletin 500 line motor starters
- Manual Reset — Requires manual intervention to reset after trip, preventing unintended restarts
- Compact Design — Minimal footprint for integration into control enclosures and motor starter assemblies
Technical Specifications
- Current Rating (Size 00–0): 4.94–5.13 Amps, Full Load Amps 5.44
- Current Rating (Size 1): Full Load Amps 5.46
- Type: Type W Eutectic Alloy
- Trip Class: Class 20
- Reset Type: Manual
- Standard: KC
- Product Category: Overload Heater Element
- Weight: 0.05 lbs
- Bulletin: 500 Line Starters
Typical Applications
The Allen-Bradley W45 heater element is used in:
- AC induction motor protection circuits with Bulletin 500 magnetic motor starters
- General-purpose industrial motor control applications
- NEMA-compliant overload relay assemblies
- Motor circuits requiring Class 20 thermal overload protection
- Control panel and machine tool motor starter circuits
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 line magnetic motor starters
- NEMA-compliant thermal overload relay assemblies
- Type W overload relay sockets rated for Class 20 protection
- AC motor control circuits requiring 5–5.5 amp overload sensing
Replaces / Drop-In Replacement For
- Original Allen-Bradley W45 heater elements
- OEM replacement heater elements for Bulletin 500 starters with Class 20, Type W configuration
Works With
- Bulletin 500 thermal overload relays and magnetic motor starter assemblies
- Manual and magnetic starter contactors rated for Class 20 protection
- Standard NEMA overload relay sockets compatible with Type W elements
