The CE3030H breaker is obsolete.
The Replacement breaker is a Square D HLL36030 breaker with a HDCMH mounting kit. The HLL breaker is rated 50KAIC at 600V, the CE-H was rated 35 KAIC.
The HDCMH will mount two H frame breakers.
An S37444 is included in the HDCMH to convert breaker from Lug-Lug to Lug-Pad. If a second breaker is being mounted on the HDCMH Hardware, order an additional S37444.
Hardware Kit requires both sides of panel and will only mount Powerpact H Breakers.