The Allen Bradley catalog number W16 refers to an overload relay heater element designed for use with Bulletin Series 100, 500, 609, and 1200 motor starters. This W-type heater uses a eutectic alloy to provide reliable Class 20 protection, suitable for current ratings between 0.31 and 0.37 amps. It fits sizes 0, 1, 00, 24A, 32A, or 40A and is rated for operation in ambient temperatures up to 40°C. This component meets NEMA certification standards and is available through BSP Automation, ensuring dependable performance in motor protection applications.