Allen Bradley Overload Heater Sizing

Refer to the specified table and use the controller size and motor amps to select the heater catalog number.

Allen bradley overload heater sizing.

Control size motor amp phase enclosure 1. We are dedicated innovators delivering smarter connected solutions to the world around us. Allen bradley standard overload relay protection using either type n or w heater elements provide class 20 operation and are recommended for general application. Sizing for overload is important to avoid serious damage for electrical application such as motor starter machinery or others electrical equipment.

Refer to the specified table and use control size and motor amps to select the heater code number. That overload relay you have is basically the same one that would go on a size 1 starter usually limited to 27a. Automation is our foundation. The allen bradley heater tables below are two of the most common used for sizing standard overload relay protection for type n and type w heater elements.

Allen bradley standard overload relay protection is provided using type w heater elements for the 500 line. Find heater table number below using the product class type of enclosure and control size. Our future is propelled by our long legacy of creating allen bradley integrated control and information solutions that make you as productive as possible. A class 30 overload relay will trip in 30 seconds or less at a current equal to 600 percent of its rating.

According to nec the general requirement for overload sizing be set around 115 or 125 from full load ampere we should setting the overload relay within this parameter to avoid electric motor from serious damage. If motor amps are not. Heater table number is found in the column under the type of overload and phase. The next column to the right would be for a size 2 overload and so on.

Find heater table number below using the product class controller size and phase. B controller size b motor amp b phase 1. Because its not hitched to a starter its allowing you to go to 40a. This provides class 20.

Type w heater elements for bulletin 509 starters table 150. 0 18 0 20 0 22 0 24 0 26. Heater table number is found in the column under the type of overload and phase. A class 20 overload relay will trip in 20 seconds or less at a current equal to 600 percent of its rating.

In this episode daryn sheds light on the importance of motor starter heater sizing how to do it properly and efficiently. The old style type n heater elements are used with bulletin 709 motor starters and overload relay blocks. Allen bradley overload relay heater tables for bulletin 709 509. While the type w heater elements are used with current bulletin 509 motor starters and overload relay.