OVERVIEW

Official designation: Allen-Bradley W50 (W Series, Heater Element)

Role/Application: A thermal unit utilizing eutectic alloy technology to provide reliable Class 20 overload protection for compatible motor starter applications.

KEY SPECS SUMMARY

Power: Full load current 8.13 to 8.45 amperes

Interfaces / Ports: Plug-in type connection

Indicators: N/A

Operating Temp: Relay rating is 115 percent at plus 40 degrees C

Platform / Compatibility: For Bulletin 500 Line Starters

Limit: Trip class 20

Lifecycle: Active or replacement required

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the primary characteristic of the eutectic alloy used in the W50 heater element?

A: The eutectic alloy melts at a precise temperature, providing a stable and accurate thermal trip response.

Wiring & Installation:

Q: What is the primary application for the W50 heater element with its Class 20 protection?

A: Class 20 protection is recommended for general applications, providing a trip time of 20 seconds or less at 600 percent current.

Troubleshooting & Compatibility:

Q: Does the W50 heater element rating need adjustment if the motor and controller ambient temperatures differ significantly?

A: Yes, heater selection may require adjustment if the temperature difference exceeds plus 10 degrees C.

Replacement & Upgrades:

Q: Is the W50 heater element compatible with various motor starter sizes like Size 00 or Size 1?

A: Yes, the W50 is compatible with motor starter sizes including 00, 0, 1, and 2, but the full load amp range varies by size.