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Switch Output RCMU
Simple, Reliable, and Cost-Effective Leakage Protection
What is an Switch Output RCMU?
A Switch Output Residual Current Monitoring Unit (RCMU) is a digital sensor designed to provide a simple, reliable go/no-go signal when residual current exceeds a pre-set threshold. Unlike traditional analog RCMUs, which output a continuous voltage signal, the Switch Output RCMU uses an integrated comparator circuit that directly generates a high or low digital output.
This design simplifies your system by eliminating the need for an external comparator or the use of an ADC (Analog-to-Digital Converter) channel on a microcontroller (MCU). It also reduces circuit complexity, making it easier to integrate into existing systems.
When the measured residual current exceeds the threshold, such as 6mA DC or 30mA AC, the sensor outputs a digital signal. This signal can be directly connected to the GPIO (General Purpose Input/Output) pins of an MCU or used to drive a relay, making it ideal for applications that require fast and reliable detection of leakage faults.
In summary, the Switch Output RCMU provides a straightforward and cost-effective solution for residual current detection in safety-critical applications, where reliability and ease of integration are paramount.
The Core of Precision: A Digital-First Approach
The iFluxgate® process is executed in three key steps by our patented, on-chip digital signal processor (DSP):
Key Advantages
Why Choose Our Switch Output RCMU for Your Applications
Provides a simple high/low signal, eliminating the need for an external comparator or ADC.
Factory-set trip points (e.g., 6mA DC, 30mA AC) ensure compliance with safety standards like IEC 62955.
Easily interfaces with any standard MCU GPIO or can directly drive a relay.
Reduces overall system BOM cost by integrating the comparator function.
High precision and frequency response prevents false alarms from high-frequency noise.
Small package size allows for easy integration into spaceconstrained designs.
application
Applications in Detail
The Switch Output RCMU provides a cost-effective and efficient solution for electric vehicle (EV) charging stations. It offers reliable leakage protection, ensuring the safety of the charging process. The RCMU monitors residual current and outputs a high/low signal when the threshold is exceeded, triggering necessary protection measures during the charging process.
- Reliable Leakage Protection
- Cost-Effective Solution
- Easy Integration with Charging Systems
In energy storage systems, the Switch Output RCMU monitors leakage currents from batteries and other storage devices, ensuring quick disconnection of power in case of faults. With a switch output signal, it reduces the need for additional hardware, enhancing both system safety and reliability.
- Instant Fault Detection
- Low Power Consumption
- Seamless System Integration
In industrial equipment safety, the Switch Output RCMU plays a vital role, especially in variable frequency drives (VFDs), UPS systems, and servo drives. It provides real-time monitoring of leakage currents, preventing equipment damage and ensuring operator safety.
- Protection for Critical Equipment
- High Sensitivity for Fault Detection
- Durable for Harsh Environments
application
Applications in Detail
The Switch Output RCMU provides a cost-effective and efficient solution for electric vehicle (EV) charging stations. It offers reliable leakage protection, ensuring the safety of the charging process. The RCMU monitors residual current and outputs a high/low signal when the threshold is exceeded, triggering necessary protection measures during the charging process.
- Reliable Leakage Protection
- Cost-Effective Solution
- Easy Integration with Charging Systems
In energy storage systems, the Switch Output RCMU monitors leakage currents from batteries and other storage devices, ensuring quick disconnection of power in case of faults. With a switch output signal, it reduces the need for additional hardware, enhancing both system safety and reliability.
- Instant Fault Detection
- Low Power Consumption
- Seamless System Integration
In industrial equipment safety, the Switch Output RCMU plays a vital role, especially in variable frequency drives (VFDs), UPS systems, and servo drives. It provides real-time monitoring of leakage currents, preventing equipment damage and ensuring operator safety.
- Protection for Critical Equipment
- High Sensitivity for Fault Detection
- Durable for Harsh Environments
application
Applications in Detail
The Switch Output RCMU provides a cost-effective and efficient solution for electric vehicle (EV) charging stations. It offers reliable leakage protection, ensuring the safety of the charging process. The RCMU monitors residual current and outputs a high/low signal when the threshold is exceeded, triggering necessary protection measures during the charging process.
- Reliable Leakage Protection
- Cost-Effective Solution
- Easy Integration with Charging Systems
In energy storage systems, the Switch Output RCMU monitors leakage currents from batteries and other storage devices, ensuring quick disconnection of power in case of faults. With a switch output signal, it reduces the need for additional hardware, enhancing both system safety and reliability.
- Instant Fault Detection
- Low Power Consumption
- Seamless System Integration
In industrial equipment safety, the Switch Output RCMU plays a vital role, especially in variable frequency drives (VFDs), UPS systems, and servo drives. It provides real-time monitoring of leakage currents, preventing equipment damage and ensuring operator safety.
- Protection for Critical Equipment
- High Sensitivity for Fault Detection
- Durable for Harsh Environments
Technical Specifications
| Series | Model | Package style | Certification/ | I△n rms [mA] | Overcurrent | Application scenario | Applicable |
|---|---|---|---|---|---|---|---|
| SM Series | RCMU101SM8-6EI-AK |  | CE | 6mA DC/30mA rms | 40A | Charging mode two/mode three | Single phase 7kW |
| RCMU101SM7-EI-7WK |  | / | 6mA DC/30mA rms | Customize | Charging mode three | Single phase 7kW | |
| RCMU101SM1-2EI-K |  | CE | 6mA DC/30mA rms | 20A | Charging mode two/mode three | Single phase 3.3kW | |
| RCMU101SM3-6EI-K |  | CE | 6mA DC/30mA rms | 42A | Charging mode two/mode three | Single phase 7kW | |
| RCMU101SM3-6EI-UD |  | CE/UL | CCID20/6mA DC | 42A | American standard charging mode Level 1/2 | American standard 0~9.6kW |
| Series | Model | Package style | Certification/ | I△n rms [mA] | Overcurrent | Application scenario | Applicable |
|---|---|---|---|---|---|---|---|
| SN Series | RCMU101SN-4P4E-7LUD |  | CE/UL | CCID20/6mA DC | 40/80 | American standard charging mode Level 1/2 | American standard 0~19.2kW |
| RCMU101SN-4P4E-4SK |  | CE | 6mA DC/30mA rms | 32A | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-4P4E-6MK | | CE | 6mA DC/30mA rms | 32A | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-4P4E-6MU | | CE | 20mA rms | 32A | Charging mode two/mode three | 美标桩 | |
| RCMU101SN-4P4E-6SK | | CE | 6mA DC/30mA rms | 32A | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-4P4E-7LK5 |  | CE | 6mA DC/30mA rms/20mA rms | 32A | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-4P6E-6MD |  | CE | 6mA DC | 42A | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-4P6E-6MK |  | CE | 6mA DC/30mA rms | 42A | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-4P6E-6MUD | | CE/UL | CCID20/6mA DC | 40/80 | American standard charging mode Level 1/2 | American standard 0~19.2kW | |
| RCMU101SN-4P10E-6SK | | CE | 6mA DC/30mA rms | 80A | Charging mode two/mode three | Three-phase pile |
| Series | Model | Package style | Certification/ | I△n rms [mA] | Overcurrent | Application scenario | Applicable |
|---|---|---|---|---|---|---|---|
| SN-E Series | RCMU101SN-E-4MD-D1 |  | CE | 6mA DC | Customize | Charging mode two/mode three | Three-phase 11/22kW |
| RCMU101SN-E-5SUD-D1 |  | CE/UL | CCID20/6mA DC | Customize | American standard charging mode Level 1/2 | American standard 0~19.2kW | |
| RCMU101SN-E-7LUD |  | CE/UL | CCID20/6mA DC | Customize | American standard charging mode Level 1/2 | American standard 0~9.6kW | |
| RCMU101SN-E-7LK | | CE | 6mA DC/30mA rms | Customize | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-E-4DK-D1 |  | CE | 6mA DC/30mA rms | Customize | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-E-4MK-D1 | | CE | 6mA DC | Customize | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-E-4SD-D1 | | CE | 6mA DC | Customize | Charging mode two/mode three | Three-phase 11/22kW | |
| RCMU101SN-E-6SK |  | CE | 6mA DC/30mA rms | Customize | Charging mode two/mode three | Three-phase 22kW |
How to Select Your Sensor？
Understand Your Application's Safety Standards
Before selecting your Switch Output RCMU, the first thing to consider is the safety standards required for your application. The sensor must comply with standards like IEC 61851, IEC 62752, GB/T 41589, UL 2231-2, and others, depending on your application type (e.g., EV charging, industrial equipment, etc.).
Key Points:
EV Charging Requirements: Depending on whether you’re working with AC or DC charging stations, the sensor must provide Type B or A+6mA protection. The Mode 2 (IC-CPD) and Mode 3 (AC charging pile) require different levels of protection.
Residual Current Protection: Ensure the sensor covers the required residual current protection, such as 6mA DC, 30mA AC, or smooth DC.
Standards Compliance: Check if the sensor complies with the relevant standards like IEC 61008, IEC 62955, or specific regional standards such as GB/T or UL.
Choosing the right protection standard ensures that the sensor meets regulatory requirements and provides the necessary protection for your application.
Select the Right Sensor Size and Configuration
The sensor size is essential to ensure proper integration with your system. Sensors come in different hole sizes (e.g., 10mm, 12.8mm, 20mm, etc.), and it is important to match the sensor’s size with the size of the conductor in your system.
Key Points:
Conductor Size: Make sure the sensor hole fits the conductor you are using. For example, the RCMU101SM2 series supports conductor diameters up to 20mm (for large installations), while RCMU101SN-E sensors offer sizes like 12.8mm and 13.5mm for smaller systems.
Application Size: Check the power rating of your system. For example, if you are working with single-phase 3.3kW, you might need a different sensor than one used for 7kW or 22kW.
Choosing the right sensor size ensures accurate monitoring and effective protection.
Determine the Sensor's Output Type
The output type is crucial for compatibility with your existing systems. Most sensors, like the RCMU101SM1 series, offer high/low output signals that can directly drive a relay or interface with a microcontroller (MCU).
Key Points:
Output Compatibility: The high-low output allows direct control of a relay or connection to an MCU GPIO pin. Ensure that your system is compatible with the open-drain or push-pull output types.
Double Trip Output: Some models, such as the RCMU101SN-E series, offer double-trip output, which allows for more flexible configurations in complex systems.
Choosing the right output ensures the sensor integrates seamlessly into your system, minimizing additional components like external comparators.
Consider Environmental Conditions
The environment in which your sensor operates can affect its performance. Temperature range, humidity, and exposure to dust or water can all impact the reliability of the sensor.
Key Points:
Operating Temperature: Sensors like the RCMU101SM1 series operate within a range of -40~85°C, making them suitable for both indoor and outdoor applications.
Environmental Protection: If you’re installing the sensor in a harsh environment, look for sensors with IP ratings or other certifications to ensure they can withstand dust, moisture, and other harsh conditions.
Selecting a sensor that meets environmental specifications will ensure it performs reliably over time.
Assess Power and Energy Requirements
Each Switch Output RCMU sensor operates within a specific voltage range and consumes a certain amount of power. Ensuring that the sensor’s power consumption aligns with your system’s capabilities is vital to avoid power supply issues.
Key Points:
Power Supply: Many sensors like the RCMU101SM1 and RCMU101SM3 operate with a +5V power supply, making them suitable for low-power systems.
Power Consumption: The self-check function integrated into many models helps reduce power consumption while ensuring the sensor operates efficiently.
Choosing a sensor with suitable power requirements ensures smooth operation in low-power or battery-powered applications.
Verify the Sensor’s Certifications and Compliance
Ensure the sensor complies with international standards and has the necessary certifications to guarantee its quality and safety.
Key Points:
Certifications: Sensors from Magtron, such as the RCMU101SM2 and RCMU101SM4, are certified by CE, UL, TÜV, DEKRA, and SGS, ensuring their reliability and compliance with global standards.
RoHS and REACH: Check if the sensor complies with RoHS and REACH regulations to ensure it meets environmental and safety standards.
Certification compliance ensures your product is globally accepted and meets the required safety standards.
Request a Sample for Testing
It’s always a good idea to request a sample of the sensor to evaluate its performance before making a bulk purchase. Testing the sensor in your application will help ensure that it meets your requirements.
Key Points:
Test Performance: Requesting a sample allows you to check the sensor’s functionality, reliability, and compatibility with your system before committing to a larger order.
Evaluate in Real-World Conditions: Testing under your actual operating conditions helps you identify any potential issues early.
Testing the sensor ensures it performs as expected, reducing the risk of problems after full-scale installation.
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Quality & Certifications
Magtron ensures that all our Switch Output RCMUs meet the highest quality standards, delivering reliable and safe performance for a variety of applications.
Our products are UL certified, ensuring compliance with global safety standards, including UL 2231-2, UL 61008, and UL 94-V0, guaranteeing safety and reliability in electric vehicle charging, industrial applications, and more.
The VDE 0126-1-1 certification confirms that our products meet the specific safety requirements for photovoltaic systems, providing essential protection against electrical faults.
Compliance with IEC 61851 and IEC 62955 standards ensures that our Switch Output RCMUs meet stringent electrical safety and electromagnetic compatibility (EMC) requirements, essential for integration in EV charging stations and other critical systems.
All products are RoHS compliant, ensuring they are free from hazardous substances, contributing to a safer and more environmentally friendly product lifecycle.
These certifications reflect our commitment to delivering high-quality, safe, and reliable products for a wide range of applications, including EV charging stations, energy storage systems, and industrial automation.
Why Choose Magtron?
Technology Leadership
Magtron's iFluxgate® technology offers industry-leading precision and zero drift, ensuring top-tier performance in demanding applications.
Automotive-Grade Quality
Our products meet the IATF 16949 quality standard, guaranteeing high reliability and performance in safety-critical systems like EV charging and industrial automation.
Expert Support
Our experienced engineers provide full technical support from sensor selection to system integration, ensuring seamless implementation.
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Most Popular Questions
It provides a simple digital (high/low) signal. The output remains in a 'normal' state until the residual current exceeds a pre-defined threshold (e.g., 6mA DC or 30mA AC), at which point it 'switches' to a 'fault' state.
Its primary advantage is simplicity and cost-effectiveness. It simplifies the client-side circuit design as it does not require an ADC (Analog-to-Digital Converter) or complex interpretation logic, making it perfect for mass-market applications.
The response time is typically very fast, usually within a few milliseconds of the fault condition occurring, ensuring rapid shutdown of the system to guarantee safety.
Yes, this is its primary application. It is designed to provide the essential Type B residual current detection required for AC EV chargers.
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