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This paper deals with the modelling, hardware results and model validation by measurements of a VSC assisted resonant current (VARC) dc circuit breaker (CB) and the application within a future network by simulation. The newly emerging VARC dc CB can be used as a solution for the protection of offshore multi-terminal HVDC (MTDC) grids. In this paper, the proposed VARC dc CB is modelled in detail in a PSCAD environment, by taking into account dielectric strength of the vacuum gap, high-frequency current quenching ability and parasitic components. The PSCAD-model is then verified by data from the testing of a 27 kV VARC dc CB prototype with maximum current interruption capability of 10 kA. Additionally, the initial transient interruption voltage and current slope at zero-crossing during the interruption are analyzed. With respect to scaling to a higher voltage level, three types of series connected modules are presented and the performances are compared. The performance of the series connected modules is simulated in a model of a 4-terminal HVDC grid. The obtained results validate the VARC dc CB as a promising solution for the dc fault isolation in MTDC grids. Index Terms-HVDC circuit breaker, VARC, PSCAD, circuit breaker performance, HVDC grid, transient analysis. I. INTRODUCTION HE integration of sustainable and renewable technologies is changing the existing transmission system [1]. Significant progress has been made toward the development of Voltage Source Converters (VSCs) in the last few years, which enable meshed HVDC grid to provide a promising This work has received funding from the European Commission under project 691714-PROMOTioN (Progress on Meshed HVDC Offshore Transmission Networks) through Horizon 2020 program."