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YAGEO Releases High-Sensitivity Residual Current Detectors for Safer EV Charging

17.6.2025
Reading Time: 3 mins read
A A

As global electric vehicle (EV) adoption continues to accelerate, YAGEO Group announces the release of its cutting-edge FG-R Series, a fluxgate-based AC and DC leakage current sensor designed to meet stringent international safety regulations and protect end-users.

Optimized for Mode 2 and Mode 3 EV charging systems, as well as onboard charger (OBC) applications, the FG-R Series combines precision, robustness, and compliance in a compact modular package.

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Revolutionizing Residual Current Detection

The FG-R Series is an open-loop fluxgate residual current sensor offering analog leakage current monitoring and independent digital alarms for AC and DC thresholds. Built with AEC-Q certified components to ensure automotive-grade reliability, the FG-R Series is ASIL B capable and RoHS compliant.

Key certifications include:

  • IEC 62752:2016/A1:2018
  • IEC 62955:2018 (RDC-MD)
  • UL 2231-2

With selectable leakage detection thresholds (AC: 20/30 mA, DC: 6 mA), the FG-R Series supports global EVSE regulations while reducing false triggers through precise phase detection and comprehensive self-test routines.

Advanced Functional Capabilities

  • Rated for up to 22 kW / 32 A AC charging
  • Single-phase: up to 80 A | Three-phase: up to 40 A
  • Real-time analog output for combined AC & DC residual current monitoring
  • Independent alarm outputs with open-drain logic for seamless integration
  • Operating temperature up to 105°C
  • Optimized for 50/60 Hz with stability at up to 2 kHz

Designed for Seamless Integration

Available in multiple mechanical versions, including FG-R04 and FG-R14 vertical busbar variants, the FG-R Series supports efficient assembly with:

  • Capacity for up to 4 x 6 mm² cables or busbars (up to 40 A)
  • Modular design to minimize EMI exposure
  • Simplified pinout for analog and digital outputs

Technical Differentiators

The FG-R Series stands out with:

  • Custom driving IC for improved oscillator stability
  • Enhanced phase angle response to reduce nuisance tripping
  • Self-test pin for diagnostic cycling without load interruption
  • Multi-standard certification for global compatibility

Expanding Beyond EVSE: Meeting the Demands of Mobile Energy Hubs

The FG-R Series extends its applications beyond traditional EV charging:

  • Vehicle-to-Load (V2L): Ensures safety for AC outlets powering various appliances directly from EVs.
  • Vehicle-to-Grid (V2G): Supports three-phase power transfer for energy discharge back to homes and grids.

YAGEO is also preparing to launch a new series with full three-phase RCD detection, addressing V2L and V2G needs with enhanced performance and reliability.

Application Tip for IEC62955 Compliance:

Design engineers should note that DC and AC alarms operate independently. However, DC alarms may trigger during high AC leakage (>60 mA). The upcoming FGR1 part series, featuring a newly designed ASIC, will ensure alarm independence without any required delay.

Related

Source: YAGEO

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