Bus Connection Hardware for PRL4 Panelboards (Also Westinghouse PRL4 and Challenger PM4) Mounts Two (2) K-Frame Circuit Breakers 400A Max - OEM Item KPRL4KDT Is Provided as PCS Brand Aftermarket Kit # KD4K. PCS Products are Fully Engineered to Meet or Exceed the Original Equipment Manufacturer's Specifications for Modern Electrical Distribution Requirements. All Products Come Complete with Detailed Safety and Installation Instructions for Field Install and Include all Necessary Screws, Brackets, and Cover Plates for New Installation.