Type W heater elements are used with current Bulletin 509 motor starters and Overload Relay Blocks. Overload relays are intended to protect motors, controllers, and branch-circuit conductors against excessive heating due to prolonged motor overcurrents up to and including locked rotor currents. Protection of the motor and the other branch-circuit components from higher currents, due to short circuits or grounds, is a function of the branch-circuit fuses, circuit breakers, or motor short-circuit protectors.

• W61
• Allen Bradley Brand
• FLA: 21.3, 21.9, 24.8, 27.5 Amp
• Size 1, 2, 3 and 4
• Thermal Overload Relay Heater Element