Overview
The Allen-Bradley W49 heater element is a precision-engineered thermal overload relay component manufactured by Rockwell Automation. This eutectic alloy heater element delivers reliable motor protection in industrial automation and control systems, functioning as the thermal sensing element within overload relay assemblies. The W49 is part of the legacy W-Series heater family, widely used across NEMA-compliant motor starters, overload relays, and contactors.
Key Features
- Eutectic alloy construction for predictable thermal response and trip characteristics
- Class 20 trip class provides standardized overload protection curves
- Manual reset type for controlled circuit protection
- Compatible with Bulletin Series 100, 500, 609, and 1200 motor control products
- Rated for ambient temperature operation at 40°C
- Used in Bulletin 509 starters and 592 overload relays
Technical Specifications
- Heater Type: Eutectic Alloy, Type W
- Reset Type: Manual
- Trip Class: Class 20
- Amperage Rating (Sizes 0/1/00/24A/32A/40A): 6.68 to 9.03 Amps
- Amperage Rating (Size 2): 7.43 to 8.2 Amps
- Amperage Rating (592-BOV16): 7.83 Amps
- Ambient Temperature: 40°C maximum rated
- Part Number: W49
- Manufacturer: Allen-Bradley / Rockwell Automation
Typical Applications
- Three-phase AC motor protection in industrial machinery
- Overload protection in combination motor starters
- Use in NEMA 1, 3R, 4, and 12 rated enclosures
- Legacy motor control system upgrades and maintenance
- Bulletin 509 NEMA starters and 592-series overload relays
- Food processing, HVAC, material handling, and pump applications
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 509 motor starters (all sizes)
- Allen-Bradley Bulletin 592 overload relays
- Bulletin 100, 500, 609, and 1200 series motor control products
- NEMA-standard motor starter enclosures and control systems
- Manual starters and soft-starters using 592-series overload modules
Replaces / Drop-In Replacement For
The W49 is a direct replacement heater element for any system currently specifying the W49 part number. Verify compatibility with your system integrator before ordering to ensure correct amp rating and size selection for your specific application.
Works With
- NEMA motor starter control circuits
- Three-phase AC power systems
- Manual and automatic control logic
- Thermal overload sensing systems
- Legacy Rockwell Automation contactors and starters
