W55 | Allen-Bradley Bulletin 500 Type W Heater Element Class 20

Description 

The Allen-Bradley W55 is a heater element designed for use with Bulletin 500 Line Starters and compatible overload relays. It is a Type W eutectic alloy heater element rated for full load currents in the 12.8–13.8 A range and supports Trip Class 20 protection. This heater element provides dependable thermal overload sensing for motor protection applications.

Technical Specifications 

Information About W55

The W55 is an Allen-Bradley heater element engineered specifically for use in eutectic alloy overload relays associated with Bulletin 500 Line Starters. It is classified as a Type W heater and is available for multiple starter sizes, including 00, 0, 1, and 2, each aligned with defined motor full load current ranges. The heater element functions as the thermal sensing component within the overload relay, responding to sustained overcurrent conditions. It is commonly used in motor control systems where Trip Class 20 protection is required to balance motor starting characteristics and overload protection.

Key Features

• Bulletin 500 Compatibility: Designed for seamless integration with Allen-Bradley Bulletin 500 Line Starters and overload relays.
• Type W Heater Element: Identified for specific motor full load current ranges within standard overload relay assemblies.
• Class 20 Trip Rating: Provides controlled thermal response suitable for motors with moderate starting times.
• Eutectic Alloy Construction: Ensures consistent thermal behavior and reliable overload detection.
• Wide Starter Size Support: Applicable to starter sizes 00, 0, 1, and 2 depending on motor current requirements.
• Motor Overload Protection: Protects motors from sustained overcurrent conditions that could lead to overheating or damage.

The W55 delivers the reliability and precision required for thermal overload protection in Allen-Bradley Bulletin 500 motor control systems.