In the "New BE Series Catalog - 2013" located on the BE webpage, there is a Size 23 Electrically Released Brake Option listed in the motor specifications. The BE23 brake is NOT a standard option, but must be ordered as a custom through your Parker ATC. As a result there is no length adder for the BE23 brake option shown in the dimensional drawing located in the brochure, even though there is a specification for the brake listed in the table.
The length adder for this 10 in-lb brake is 1.31 inches, which will be added to "L" and "Motor Length" shown in the drawing below. Below, also, are the overall motor lengths for each stack length with this 10 in-lb brake option added to the motor for FL, LC, MS, PS and Cable motors. The brake option in NOT available for FO option motors.
Motor Size - Motor Length (inches)
BE230 - 4.45
BE231 - 4.95
BE232 - 5.95
BE233 - 6.95