In the era of modern electrification, the demand for Type B RCD (Residual Current Device) Current Transformers has transitioned from a niche industrial requirement to a global safety mandate. Unlike standard Type A sensors, Type B current transformers are engineered to detect not only sinusoidal AC residual currents but also smooth DC residual currents and high-frequency AC components. This capability is critical in environments dominated by power electronics, such as Variable Frequency Drives (VFDs), UPS systems, and Electric Vehicle Charging Stations.
As the global energy transition accelerates, industrial and commercial sectors are increasingly adopting Type B technology to ensure the highest levels of protection against electric shocks and electrical fires. International standards like IEC 62423 and IEC 61851-1 have set the benchmark, driving factories and suppliers to innovate high-precision magnetic cores and intelligent sensing modules.
Rooted in innovation since 1993, Fujian Smrtr Technology Co., Ltd. (Zentar®) represents the pinnacle of Chinese manufacturing excellence.
Fujian Smrtr Technology Co., Ltd. (Zentar®) is a leading manufacturer of magnetic components for electrical safety and power measurement. Founded in 1993, we have cultivated nearly three decades of expertise in providing customized services for current transformers, RCD fused connection units, and wireless energy monitors. Our facilities in Xiamen employ over 410 dedicated professionals, including a high-caliber R&D team led by professors and 20 senior engineers.
Our commitment to E-E-A-T (Experience, Expertise, Authoritativeness, and Trustworthiness) is evidenced by our long-standing ISO9001 (since 2002) and IATF 16949 certifications. These rigorous standards ensure that every Type B residual current sensor leaving our factory meets the precise safety requirements of global markets, including Europe, North America, and Southeast Asia.
We leverage advanced ERP systems (introduced in 2008) to maintain a lean supply chain, ensuring short lead times and competitive pricing without compromising on technical integrity.
Where Type B RCD Current Transformers are Essential
Type B sensors are mandatory in EV Charging Piles (Mode 3 and Mode 4) to detect DC leakage currents (6mA DC) that could saturate standard Type A RCDs, ensuring user safety during the charging process.
In PV inverters, residual current monitoring is vital for detecting insulation faults and preventing potential hazards in DC arrays and AC grid connections.
Essential for Variable Frequency Drives (VFDs) and Servo Motors where high-frequency switching and DC components are prevalent in the leakage profile.
Critical for MRI machines and UPS systems in data centers, where continuous power and high-sensitivity fault detection are paramount for operational continuity.
Utilized in Smart Meters and Energy Management Systems to provide real-time leakage monitoring and sub-metering cost allocation.
Our Split Core RCD Sensors are perfectly suited for retrofitting existing electrical systems without the need for cable disconnection, ideal for fire safety upgrades.
As a specialized Type B RCD Current Transformer factory, we offer unmatched advantages to global distributors and OEMs:
Wire Wrapping
Quality Testing
Auto Winding
Laser MarkingEnsuring consistency and reliability through automated precision
Wire Wrapping
Rubberized Cloth
Silicon Steel Sheet
Soldering Tin
Comprehensive Testing
Automatic Coil Winding Machine
Laser Marker Application
Coil Winding Machine
Automatic Soldering Machine
Eight Axis Winding Machine
Coil Winding Machine
Smrtr Technology
