The Siemens 3VM9213-0KB03 is a terminal cover for the plug-in socket of a 3-pole 3VM12 circuit breaker. This is the accessory that goes over the line-side or load-side terminals after wiring, providing finger-safe coverage and keeping debris out of the connection zone in a panel.
Packaging and handling
Shipped individually, one piece per package. Box dimensions are 170 x 120 x 30 mm — small enough to toss in a panel-build kit or a spare-parts drawer without eating shelf space. No special handling; it's a molded plastic cover.