CCS

Combined Charging System is a single connector standard that combines AC charging and DC fast charging in one physical interface, eliminating the need for separate cables and receptacles on an electric vehicle. A single CCS port on a vehicle can accept both Level 2 AC charging (up to 19.2 kW in North America) and DC fast charging (up to 350 kW on current hardware). The connector itself is a modified Type 2 plug (IEC 62196-2) with two additional DC power contacts recessed below the AC pins.

CCS exists in two regional variants: CCS1, which is used in North America and Japan, appends two large rectangular DC contacts below a Type 2 AC connector; CCS2, used in Europe and increasingly worldwide, integrates the DC contacts directly beneath the AC pins in a more compact arrangement. Both versions transmit power, ground, and control signals through the same housing, with the vehicle's onboard charger or inverter automatically selecting between AC and DC operation based on what the charging station provides.

Why standardization mattered

Before CCS adoption, the EV market fragmented around incompatible connectors: Tesla used its proprietary connector, CHAdeMO was favored in Japan, and multiple AC standards competed in Europe. This created a logistics nightmare for fleet operators and slowed consumer adoption. CCS consolidated this mess by combining the two charging modes in a single port, which reduced vehicle wiring complexity, manufacturing cost, and owner confusion. Automakers could ship the same vehicle architecture across regions with only minor firmware and connector changes.

Modern DC fast charging stations deliver between 50 kW and 350 kW to a CCS-equipped vehicle, with power limited by the vehicle's onboard battery management system, cable rating, and station capacity. A typical 150 kW installation can add 200 miles of range in 20-30 minutes on a 60-80 kWh battery pack. Charging speed degrades as the battery reaches full state of charge, a thermal management issue rather than a connector limitation.

CCS has become the de facto global standard for new passenger vehicles, with legacy competitors (CHAdeMO, proprietary Tesla Supercharger) now being phased out or retrofitted with adapters. The connector and protocol are defined in ISO 15118 (vehicle-to-grid communication) and IEC 61851-23 (safety and control), with China adopting CCS2 architecture for its national EV infrastructure despite earlier promotion of the GB/T standard.