South Korean EV charging manufacturer SK Signet has launched a new model, the 400kW All-in-One EV charger.
The ultra-fast charger uses high-density silicon carbide (SiC)-based power modules and a “high-efficiency” power design, reducing the space needed for deployment.
In most cases, higher-powered chargers require distributed power conversion systems installed close to the charging plug. By integrating power cabinets and charging plugs into a single unit, SK Signet said it simplifies installation and reduces civil construction costs.
“The new 400kW All-In-One model is a breakthrough that simultaneously innovates power efficiency, density, and reliability,” said Hyungki Cho, CEO of SK Signet. He added the company will “spearhead the evolution of ultra-fast charging networks” using its “unrivalled leadership in technology”.
As newer EV models increasingly feature 800V high-voltage battery architecture, enabling faster charging speeds, the demand for ultra-fast charging infrastructure has grown; the US is seeing more deployment of 400kW infrastructure.
Most chargers at this power, SK Signet’s included, can offer dual charging at lower speeds—in this case, 150-250kW charging to multiple vehicles—or deliver full 400kW capacity to EVs equipped with high-voltage platforms.
According to the company, which operates a manufacturing facility in Texas, US, the SiC-based high-density power architecture in the 400kW All-In-One unit delivers stable charging with minimal energy loss. It said the technology can achieve up to 96.5% power conversion efficiency.
It also operates with a modular power architecture, enabling operators to scale capacity as demand grows.
Chargepoint operators can configure power at 320kW, 360kW or 400kW, scaling by adding power modules as opposed to replacing entire units.
The new model effectively doubles the capacity per square foot, with SK Signet saying that compared to its V2 200kW All-In-One units, the 400kW All-In-One charger reduces the required installation area by approximately 54%.
The units support both CCS1 and North American Charging Standard (NACS). SK Signet has begun the initial production phase of the technology in the US and said it aims to launch in the European market by the end of this year, eventually scaling up to supply the hardware globally.
SK Signet was acquired by the SK Group in 2021, operating in South Korea as Signet EV, renamed in 2022. SK On, the battery unit of SK Innovation, which along with SK Signet operate as subsidiaries of SK Group, currently holds a majority stake in SK Signet but has since May 2025 been seeking to divest it.
