Bus Connection Hardware for PRL4 Panelboards Mounts One LG-Frame Circuit Breaker 600A Max. Circuit Breakers NOT Included. - OEM Item KPRL4LG. Hardware Kits 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.