In the rapidly evolving landscape of Electric Vehicle (EV) infrastructure, the Type B RCD (Residual Current Device) has transitioned from an optional component to a mandatory safety requirement in most developed markets. Unlike standard Type A RCDs, Type B units are specifically designed to detect smooth DC residual currents in addition to normal AC, high-frequency AC, and pulsating DC leakages.
As EV on-board chargers (OBC) and DC fast charging stations become more complex, the risk of 6mA DC leakage increases. International standards such as IEC 62955 and IEC 61851-1 now explicitly require protection against DC residual currents to prevent the "blinding" of upstream Type A RCDs, ensuring the entire electrical installation remains safe.
Dongguan Rama Charger Technology Co., Ltd. — Your Expert in Intelligent Charging
Dongguan Rama Charger Technology Co., Ltd. is a technology-driven enterprise integrating R&D, design, manufacturing, sales, and service into a seamless operation. We specialize in providing comprehensive system energy solutions for electric vehicle charging and related applications. With strong independent R&D capabilities in charging controllers, Rama Charger provides customized core master control boards for charging pile manufacturers worldwide.
Our headquarters has obtained multiple authoritative certifications, including DEKRA CB, CE, and ISO9001, as well as recognition as a High-Tech Enterprise and Technology SME. We maintain a robust quality management system, having secured 15 software copyrights and multiple invention, utility model, and design patents, reflecting our unwavering commitment to innovation and excellence in the EV charging sector.
Global B2B buyers—ranging from EVSE installers to commercial fleet managers—prioritize reliability and certification compliance. Sourcing from a specialized factory ensures that Type B RCDs meet local grid codes and safety regulations (e.g., TUV, UL, CE) while maintaining competitive pricing for large-scale infrastructure projects.
As a leading Chinese manufacturer, Rama Charger leverages the world's most complete power electronics supply chain. We offer shorter lead times, high-volume scalability, and deep customization of Type B leakage sensors to fit specific charger designs, providing a significant edge over traditional Western suppliers.
From Public DC Fast Charging in Norway to Residential Wallboxes in California, Type B RCDs are the silent guardians of the grid. Our products are engineered to withstand diverse environments, ensuring stable performance in extreme temperatures and varied humidity conditions.
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