Square D?-brand I-Line? circuit breaker power distribution panelboards are for use on AC or DC systems. The panels, labeled cULus (compliance to UL and CSA standards certified by UL) are also Underwriters Laboratories® (UL®) Listed under File E33139. The following are suitable for use as service entrance equipment such as all main circuit breaker panelboards. I-Line circuit breaker panelboards are available as 400?1200 A main lugs only and 100?1200 A main circuit breakers. I-Line circuit breaker panelboards are designed, manufactured, and tested to comply to UL, CSA, NFPA, NEMA & W-P standards. This blank plate has a narrow surface and used for H and J frame. It has a quantity of 5 and is 4.5 inches.