The Siemens 3VA9987-0TF20 is a SENTRON-branded extension cable, designated COM060, at 0.4 m length, intended as an accessory for the 3VA molded-case circuit breaker line. This is the cable that bridges the breaker's communication port to a remote display or control module — think of it as the physical link for the COM060 interface, not a power cable.
This cable is a 0.4 m pre-terminated extension, so it plugs directly between the breaker's COM060 module and a panel-mounted HMI or gateway. No field termination, no crimping — just route it inside the enclosure and snap the connectors. The 0.4 m length suits a breaker mounted near the door or a local display; for longer runs you'd need a different COM060 cable variant in the 3VA accessory family.