HYCA-07-MD: Precision Leakage Protection

Product Overview

The HYCA-07-MD Residual Current Monitoring Unit, developed by Wenzhou Heyi Electrical Co., Ltd., is a high-precision and reliable safety monitoring device designed for modern power systems and electric vehicle charging infrastructure. As a critical component for electrical safety, it continuously monitors leakage currents (including both AC and DC components) in systems and promptly disconnects power when hazardous currents are detected, effectively preventing electric shock accidents and electrical fires.

Core Technical Features

1. Dual-Mode Detection Capability

   • Innovative AC/DC hybrid detection technology simultaneously identifies AC residual currents (e.g., 50Hz power frequency leakage) and DC residual currents (e.g., DC leakage from PV systems or EV charging).

   • Supports multiple waveform detections including S-DC (smooth DC), 2PDC (two-phase pulsating DC), and 3PDC (three-phase pulsating DC), fully compliant with IEC 62752 and IEC 62955 standards.

2. Smart Threshold Management

   • Dynamic threshold technology: Trigger threshold (Iₐₜ) set at 100% of typical tripping value, with recovery threshold (Iₐₓ) at 55%, effectively preventing false triggering due to signal oscillation.

   • Three-level protection: Graded response at 6mA/60mA/200mA, with reaction times optimized from 1000ms (6mA) to 50ms (200mA), balancing safety and power continuity.

3. Self-Test and Calibration System

   • Integrated patented self-test circuit generates 6.53mADC simulated current via ZCT secondary winding for startup self-check (test cycle ≤400ms).

   • Hardware calibration interface (CAL pin) supports automatic zero-point drift compensation, ensuring long-term measurement accuracy.

Outstanding Performance Parameters

• Environmental Adaptability

  • Wide operating temperature range: -40℃ to +85℃ (storage temperature: -20℃~+65℃)

  • High-altitude support: ≤4000m (suitable for plateau regions)

  • Moisture-resistant design: Stable operation at 95% relative humidity

• Electrical Characteristics

  • Ultra-low power consumption: <110mW (current ≤22mA at 5V supply)

  • Fast response: ≤100ms tripping time at 200mA leakage

  • Long-life design: Theoretical service life ≥20 years (based on 85℃ accelerated aging tests)

Typical Applications

1. EV Charging Infrastructure

   • Public charging stations: Detects insulation degradation during charging to prevent DC leakage hazards

   • Home wallboxes: Complies with GB/T 18487.1-2015 standards

2. Renewable Energy Systems

   • PV inverters: Monitors DC-side insulation faults in strings

   • Energy storage systems: Early warning for battery pack leakage

3. Industrial Power Safety

   • Variable frequency drive output circuits: Detects motor winding ground leakage

   • Medical IT systems: Meets IEC 60364-7-710 requirements for medical facilities

Installation and Usage Advantages

• Compact Design
  PCB-mounted form factor (see manual for dimensions) with customizable cable lengths, ideal for space-constrained applications.

• Plug-and-Play Interface
  Standard 5-pin configuration:

  • VDD (4.85-5.15VDC)

  • TRIP (open-drain output, high-level trigger)

  • CAL (active-low calibration signal)

  • TEST (self-test trigger input)

• Automated Testing
  Compatible with timing control (T1-T6 parameters) for integration into production line test fixtures, significantly improving efficiency.

Compliance and Certifications

• Fully compliant with RoHS/REACH environmental directives

• EMC tested (EN 61000-6 series) by CNAS-accredited labs

• Meets EV charging equipment standards:

  • IEC 62752 (Mode 3 charging cables)

  • IEC 62955 (RDC-MD protection devices)

Support Services

Heyi Electrical provides full lifecycle technical support:

• Free reference circuit design files (including Altium Designer schematics)

• Customization: Adjustable tripping thresholds, output logic, etc.

• Rapid response: 24-hour technical support in East China region

With its exceptional performance and reliability, the HYCA-07-MD is becoming the safety standard for smart grids, renewable energy, and e-mobility applications. For technical solutions or samples, contact Heyi Electrical's technical department.