Square D? I-Line Power Distribution Panelboards is ideal for service entrance equipment or downstream distribution panels in the electrical system. The I-Line power distribution panelboard is the most versatile on the market and feature Schneider Electric's unique breaker engagement system which allows 15A branch circuit breaker next to or across from a 1200A circuit breaker. As a main breaker panelboard, you're able to distribute central power to subpanels using the secure points. After being tested and certified by UL to adhere to the specifications listed in the datasheet, these panelboards come with a 18 month warranty.