Adding a CE1020E 20A 1 pole breaker to an existing NHDP panel?
The CE1020E breaker is obsolete.
Alternative breaker is an FFGP16020 with FF22NHDP mounting kit and MHMHDP mounting screws. Both breakers are rated at 18KAIC at 600V. Up to 6 FFGP breakers can mount on this hardware kit.
This will mount in 22 inch wide NHDP panels only. They will not mount in the older 20 inch wide NHDP panels.