Industry news--Karmin Electronic (HK) Limited

Littelfuse launches RCMP20 residual current monitor series for Mode 2 and Mode 3 charging stations
2024-11-02

Innovative design supports more compact, high current electric vehicle chargers with higher safety, design flexibility, and thermal management performance.

Littelfuse Corporation (NASDAQ: LFUS) is an industrial technology manufacturing company dedicated to providing power for a sustainable, interconnected, and safer world. The company announced today the launch of the RCMP20 residual current monitor series for Mode 2 and Mode 3 electric vehicle charging stations. The RCMP20 series sets a new standard for electric vehicle (EV) charging safety, providing excellent performance and flexibility in a compact design while supporting higher charging currents than other solutions on the market. This new product series features the industry's largest current transformer (CT) aperture, expanding Littelfuse's portfolio of electric vehicle infrastructure products and enhancing the electrical safety of electric vehicle charging applications.

The RCMP20 residual current monitor series has the following main functions and advantages:

• Maximum current transformer aperture: The RCMP20 series offers the largest current transformer (CT) aperture available, supporting higher AC charging currents, which is crucial for modern electric vehicle chargers that require high-performance functionality.
Enhanced thermal performance: Integrated conductors with larger cross-sectional areas can provide better thermal management, reduce temperature rise of printed circuit boards (PCBs), and achieve more compact designs without affecting performance.
• High EMI immunity: These modules are designed to resist electromagnetic interference (EMI), minimize erroneous circuit tripping, and improve the overall reliability of the charging station.
• Flexible installation options: With vertical and horizontal installation options and 2 to 4 integrated conductors, the RCMP20 series allows design engineers to optimize space utilization and adapt to various charger configurations.
• Compact design of integrated PCB: The size of electric vehicle chargers is smaller, the design is more compact, and still meets safety regulations. The integrated PCB with optional conductors simplifies installation, reduces component count, and simplifies assembly.

The RCMP20 series is an ideal choice for the following applications:

• Electric vehicle infrastructure: With the popularity of electric vehicles, a strong electric vehicle infrastructure is crucial. The RCMP20 series ensures the safe, efficient, and reliable operation of charging stations.
• IEC Mode 2 and Mode 3 AC Charging Stations: The RCMP20 series covers a wide range of charging needs, providing protection for portable chargers and high-power permanent stations.
• Grounding fault detection: Continuously monitor AC and DC grounding fault currents to ensure compliance with electrical safety standards and prevent the risk of electric shock.
Mechanism of action
• The main difference between Mode 2 and Mode 3 electric vehicle charging stations lies in their way of handling fault currents, especially AC and DC currents, as well as the level of electrical hazard protection they provide.
• Mode 2 charging stations are commonly used for early portable chargers and high-power charging stations. These charging stations may not have built-in protection against AC and DC fault currents, which can pose safety risks. The RCMP20-03 module helps improve safety by monitoring AC and DC residual currents. When ground fault, leakage or residual current exceeds the threshold, RCMP20-03 will trigger circuit shutdown to prevent electrical hazards. It complies with the IEC 62752 standard for Mode 2 chargers.
• Mode 3 charging station is used for longer lasting and higher power charging devices. Although these devices typically have A-type RCD (residual current device), they may miss dangerous DC currents, making users vulnerable to injury. The RCMP20-01 module is specifically designed to detect the DC residual current ignored by Type A RCD. When the DC fault current exceeds the threshold, it will send a trip signal to the connected switchgear to ensure user protection and compliance with relevant safety standards.
• In summary, the Mode 2 system with RCMP20-03 monitors AC and DC faults to enhance protection for early or portable charging devices. In contrast, the Mode 3 system with RCMP20-01 focuses on detecting DC faults missed by standard RCD, thereby improving the safety of permanent charging stations.

Supply situation

The RCMP20 residual current monitor has a separate box. Samples can be obtained from authorized Littelfuse distributors around the world. To learn about the list of authorized Littelfuse distributors, please visit Littelfuse.com.

More information

For more information, please refer to the RCMP20 residual current monitor data sheet:
RCMP20-03 series residual current monitor for Mode 2 charging station
RCMP20-01 series residual current monitor for Mode 3 charging station
If you have any technical issues, please contact:
IBU WA Application Engineer Marc Rosello, mrosello@littelfuse.com
Torsten Epkes, IBU Relay Product Management Manager, tepkes@littelfuse.com

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