VTK-SCAP-M (PN: 10VK0SCAP00X0) SuperCap BBU for in-vehicle, master
VTK- SCAP-AR-M (PN: 10VK0SCAP01X0) SuperCap BBU for railway, master
VTK- SCAP-S (PN: 10VK0SCAP02X0) SuperCap BBU for expansion, slave