The Siemens 3VM9150-0WB00 is a control wire tap for box terminal, sold as a pack of 10 units. It's an accessory designed specifically for the 3VM11 plug-in version of Siemens molded case circuit breakers — you use it to tap control wiring off the box terminal without hard-wiring through the breaker's own terminals.
Sourcing and return policy
Product class B means return is restricted — you'll need to coordinate with your Siemens partner or contact before sending anything back. That's typical for accessory packs that ship as a sealed kit.