Based on this product's specifications, here are some alternatives and similar models
Connector (twist) Simet ZSE1-1.0/6.0 red — Simet E531AA-SI027
Summary description:
Twist (wire) connector Simet ZSE1-1.0/6.0 in red, model E531AA-SI027. Designed for mechanical and electrical joining of conductors, it accepts conductors in the specified cross-section range (1.0–6.0 mm²). Suited for electrical installations, lighting circuits and household wiring where secure, insulated conductor connections are required.