Based on this product's specifications, here are some alternatives and similar models
Circuit breaker accessory Rittal SV 9677.705, adapter for 3-pole 1000A connections
Summary description:
Rittal SV 9677.705 is a circuit breaker accessory supplied as a single unit. It serves as an adapter for 3-pole connections rated 1000A and uses screw mounting for secure installation. Intended for industrial electrical panels and switchgear, it facilitates reliable high-current connections and integration of circuit breakers in distribution systems.