WRH 6kVAC Isolated Single-Output DC-DC Power Supply Module

Product Advantage

1.The WRH series has passed the rigorous three-phase electricity meter (DL/T614-2007) bidding inspection — a mandatory national certification for power utility metering equipment in China. Designed specifically for RS485 communication interface isolation in watt-hour meters, distribution load monitors, power load control terminals, and energy management terminals, every WRH module meets the exact surge withstand, electrostatic discharge immunity, and isolation voltage requirements specified by the national electric power industry standard. For meter manufacturers submitting products for State Grid and Southern Power Grid procurement tenders, the WRH eliminates the uncertainty of component-level compliance — the isolation and protection certifications are already proven at the module level, accelerating design approval and reducing qualification testing burden.

2. The WRH achieves 6,000VAC galvanic isolation (tested at 1mA leakage current) between input and output with insulation resistance reaching 10^9 Ohm and just 60pF coupling capacitance. On top of this, exposed terminals withstand 8,000V electrostatic discharge — a combination that protects the RS485 transceiver, microcontroller, and metrology IC from both sustained common-mode voltage stress and transient electrostatic events. In utility pole-top installations, meter rooms, and outdoor distribution cabinets where lightning-induced surges, switching transients, and operator ESD are daily realities, this dual-layer defense ensures the communication interface remains operational through events that would destroy unprotected meter electronics — directly reducing field failure rates and maintenance truck rolls.

3. Unlike unregulated DC-DC converters that exhibit output voltage rise at light or no load, the WRH series maintains regulation accuracy of ±2% across the full load range — including zero load. The internal regulation loop and self-recovering overload short-circuit protection (sustained for over 30 seconds) ensure that the RS485 bus power rail, microcontroller supply, or metrology analog reference voltage remains within specification regardless of whether the communication circuit is actively transmitting, idle, or temporarily faulted. Ripple and noise stay below 50mV peak-to-peak measured at 20MHz bandwidth, clean enough for precision analog-to-digital converters in metrology front-ends. Line regulation holds at ±0.5% maximum, and load regulation at ±1% from no-load to full load — ensuring consistent output across the full operating envelope.

4. Housed in a non-conductive flame-retardant black plastic SIP 7-Pin package measuring just 19.50 × 9.80 × 12.50mm and weighing only 4–6 grams, the WRH module integrates directly onto the meter's main PCB alongside the metrology IC and RS485 transceiver — eliminating the need for a separate power supply daughtercard. The clean 7-pin layout (Vin+, Vin-, NC, NC, Vout-, NC, Vout+) enforces the 6KVAC isolation creepage distance through two no-connect spacer pins between input and output domains. Natural air convection cooling requires no heatsink or forced airflow. Operating temperature spans -40°C to +85°C with storage tolerance from -55°C to +125°C and ≤90% non-condensing humidity, qualifying the module for unheated outdoor meter enclosures in northern winters and tropical summers alike.

5. Operating at an 80KHz switching frequency with conversion efficiency of 60% to 80%, the WRH minimizes internal power dissipation and thermal rise inside sealed meter enclosures where ambient temperatures can exceed 70°C during peak summer solar loading. The input accepts 3.3V, 5V, 12V, 15V, or 24VDC (±5%), while standardized output voltages of 3.3V, 5V, 9V, 12V, or 15VDC at power ratings of 0.5W, 1W, or 2W cover every common RS485 transceiver supply and microcontroller rail requirement. The temperature coefficient of just ±0.02%/°C means the output voltage remains within meter accuracy specifications across the full -40°C to +85°C operating range without requiring temperature-compensated calibration — essential for revenue-grade metering where measurement drift directly impacts billing accuracy.

6. With an operating range of -40°C to +85°C, storage tolerance to +125°C, and 1,000,000-hour MTBF, the WRH series is deployed in electric energy meters, distribution load detection instruments, power load control terminals, energy management terminals, and industrial RS485/RS422/RS232/CAN bus communication interface power isolation. The 2,761 product page views reflect its established position in the Chinese power utility supply chain. Sunyuan's f

Technical Parameters

Product Uses

Here are seven specific application scenarios of the WRH Series Power Load Management Terminal 8KV Anti-Static 6KV High Isolation Regulated Short-Circuit Protection Power Module:

1.Smart electricity meters: The module is used to provide isolated regulated power for RS485 communication interfaces in three-phase smart electricity meters, with 6KV high isolation and 8KV anti-static protection ensuring safe and reliable data transmission between metering circuits and external communication networks, fully compliant with national power industry standard DL/T614-2007 for smart metering applications deployed across power distribution grids.

2.Power load management terminals: The module is used to supply isolated power for RS485 communication ports in power load control terminals and electricity consumption management terminals, where 6KV galvanic isolation protects sensitive digital processing circuits from high-voltage transients on external communication lines, while the regulated output ensures stable operation of always-on monitoring and control functions in utility power management systems.

3.Distribution load monitoring instruments: The module is used to provide isolated power for communication interfaces in distribution load detection instruments and power quality analyzers, with 8KV anti-static protection safeguarding exposed terminal connections from electrostatic discharge encountered during field installation and maintenance, while the self-recovery overload short-circuit protection ensures continuous operation without manual intervention in remote monitoring applications.

4.Medical instrument communication interfaces: The module is used to isolate RS485 and RS232 communication ports in medical monitoring and diagnostic equipment, with 6KV galvanic isolation preventing ground loop interference and protecting patient-connected circuits from voltage transients on network communication lines, while the regulated output with 2% precision ensures reliable data transmission between medical instruments and hospital information systems.

5.Industrial automation control systems: The module is used to supply isolated power for RS485, CAN bus, and other communication interfaces in industrial automation controllers and PLC systems, with 8KV anti-static and 6KV isolation protecting communication circuits from electromagnetic interference and voltage surges in harsh industrial environments, while the wide voltage input accommodates fluctuating industrial power supply conditions.

6.IoT and smart grid communication nodes: The module is used to provide isolated power for communication modules in IoT devices and smart grid remote monitoring nodes, with 6KV isolation preventing ground potential differences between distributed monitoring points from disrupting data transmission, while the compact SIP 7Pin flame-retardant package enables integration into space-constrained smart grid communication terminals deployed throughout the power distribution network.

7.Energy storage and charging infrastructure: The module is used to isolate communication interfaces in energy storage management systems and electric vehicle charging stations, with 8KV anti-static protection safeguarding exposed communication terminals from electrostatic discharge during outdoor operation and maintenance, while 6KV isolation and self-recovery short-circuit protection ensure reliable communication between charging controllers and central management systems in demanding electrical environments