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. Service entrance panelboards meeting the requirements of CSA are available in Canada factory-assembled only. I-Line circuit breaker panelboards are available as 400?1200A main lugs only and 100?1200A main circuit breakers. This Square D 400A I-Line Solid Neutral is an electrical accessory for a HCN & HCM distribution board. This product has UL & CSA certifications. This product comes with an 18 months warranrty.