Skip to content 
Welcome to Magtron
Analog Output RCMU
High-Precision AC/DC Residual Current Sensing
What is an Analog RCMU?
An Analog Residual Current Monitoring Unit (RCMU) is a high-precision device designed to continuously monitor residual currents in both AC and DC systems. Unlike traditional Residual Current Devices (RCDs) that only provide a binary on/off output when a fault occurs, an Analog RCMU offers a continuous, real-time analog signal that is directly proportional to the magnitude of the residual current.
This continuous measurement allows for advanced safety monitoring and predictive maintenance, providing valuable data for fault diagnosis and system performance analysis. It can detect leakage currents in complex applications, such as electric vehicle (EV) chargers, photovoltaic (PV) inverters, and energy storage systems, where the detection of smooth DC leakage (Type B residual current) is critical.
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 Analog RCMU for Your Applications
Based on iFluxgate® technology, the precision is as high as 1.5%, far exceeding industry standards.
With low temperature drift across the range of -40°C to 105°C, it ensures consistent readings in harsh environmental conditions.
Capable of accurately measuring AC, pulsating DC, and pure DC residual currents, meeting the strictest Type B leakage protection requirements.
Provides continuous voltage signals for real-time monitoring and trend analysis of leakage currents.
Built-in self-check feature, enabling the system to verify the proper operation of the sensor upon power-up, ensuring compliance with safety standards.
Core chips are self-developed, ensuring supply chain security and continuous technological advancement.
Product Series: SM vs. SN
Magtron offers two product series for the Analog RCMU, the SM Series and the SN Series, each designed to meet specific application needs.
SM Series
The SM Series is designed for compact systems where space and cost are a primary concern. It provides high precision with a compact form factor, making it ideal for applications with limited space or where cost-efficiency is critical. Despite its smaller size, it maintains the same level of accuracy and performance as the SN Series, making it an excellent choice for smaller-scale or cost-sensitive projects.
- Compact design for space-saving installations
- Cost-effective solution for budget-sensitive applications
- High precision and stability similar to the SN Series
- Ideal for smaller-scale applications like residential or small commercial installations
SN Series
The SN Series is built for more demanding environments, where the highest level of accuracy and reliability is required. It offers advanced features and is designed to handle larger, more complex applications such as industrial systems, EV chargers, and large-scale energy storage projects. With a robust design and enhanced performance, the SN Series ensures optimal monitoring and safety for critical systems.
- Designed for larger-scale applications and more complex systems
- Enhanced durability and reliability under harsh conditions
- Higher precision and performance for demanding applications
- Suitable for industrial, EV, and energy storage systems
application
Applications in Detail
Magtron’s Analog RCMU is designed to provide high-precision residual current measurements across a range of demanding applications. From electric vehicle (EV) chargers to energy storage systems (ESS) and photovoltaic (PV) inverters, our RCMUs ensure the safety, performance, and reliability of critical systems in a variety of industries. Let’s explore how the Analog RCMU is applied in detail in the following key sectors
The Analog RCMU is used in EV charging stations to monitor leakage currents between the electric vehicle and the charging infrastructure, ensuring safety during the charging process. In the event of a fault, it detects leakage currents and triggers protective actions to prevent electrical fires and other safety hazards.
- High-precision current monitoring
- Complies with international safety standards
- Real-time detection and protection
In photovoltaic systems, the Analog RCMU monitors DC side leakage currents to prevent ground faults or insulation degradation, which could lead to fires. In solar inverters, the RCMU works in conjunction with other components to ensure the system disconnects safely under fault conditions.
- Accurate DC leakage current monitoring
- Optimizes energy efficiency
- Ensures safe disconnection
In energy storage systems, the Analog RCMU monitors leakage currents in the DC bus of battery packs. It plays a vital role in detecting insulation issues or system faults, ensuring the safe operation of the system over long periods, especially in battery management systems (BMS) and power conversion systems (PCS).
- Precise current measurement
- Prevents system failure and fire hazards
- Enhances long-term reliability
application
Applications in Detail
Magtron’s Analog RCMU is designed to provide high-precision residual current measurements across a range of demanding applications. From electric vehicle (EV) chargers to energy storage systems (ESS) and photovoltaic (PV) inverters, our RCMUs ensure the safety, performance, and reliability of critical systems in a variety of industries. Let’s explore how the Analog RCMU is applied in detail in the following key sectors
The Analog RCMU is used in EV charging stations to monitor leakage currents between the electric vehicle and the charging infrastructure, ensuring safety during the charging process. In the event of a fault, it detects leakage currents and triggers protective actions to prevent electrical fires and other safety hazards.
- High-precision current monitoring
- Complies with international safety standards
- Real-time detection and protection
In photovoltaic systems, the Analog RCMU monitors DC side leakage currents to prevent ground faults or insulation degradation, which could lead to fires. In solar inverters, the RCMU works in conjunction with other components to ensure the system disconnects safely under fault conditions.
- Accurate DC leakage current monitoring
- Optimizes energy efficiency
- Ensures safe disconnection
In energy storage systems, the Analog RCMU monitors leakage currents in the DC bus of battery packs. It plays a vital role in detecting insulation issues or system faults, ensuring the safe operation of the system over long periods, especially in battery management systems (BMS) and power conversion systems (PCS).
- Precise current measurement
- Prevents system failure and fire hazards
- Enhances long-term reliability
application
Applications in Detail
Magtron’s Analog RCMU is designed to provide high-precision residual current measurements across a range of demanding applications. From electric vehicle (EV) chargers to energy storage systems (ESS) and photovoltaic (PV) inverters, our RCMUs ensure the safety, performance, and reliability of critical systems in a variety of industries. Let’s explore how the Analog RCMU is applied in detail in the following key sectors
The Analog RCMU is used in EV charging stations to monitor leakage currents between the electric vehicle and the charging infrastructure, ensuring safety during the charging process. In the event of a fault, it detects leakage currents and triggers protective actions to prevent electrical fires and other safety hazards.
- High-precision current monitoring
- Complies with international safety standards
- Real-time detection and protection
In photovoltaic systems, the Analog RCMU monitors DC side leakage currents to prevent ground faults or insulation degradation, which could lead to fires. In solar inverters, the RCMU works in conjunction with other components to ensure the system disconnects safely under fault conditions.
- Accurate DC leakage current monitoring
- Optimizes energy efficiency
- Ensures safe disconnection
In energy storage systems, the Analog RCMU monitors leakage currents in the DC bus of battery packs. It plays a vital role in detecting insulation issues or system faults, ensuring the safe operation of the system over long periods, especially in battery management systems (BMS) and power conversion systems (PCS).
- Precise current measurement
- Prevents system failure and fire hazards
- Enhances long-term reliability
Technical Specifications
Magtron’s Analog Residual Current Sensors are available in a range of models tailored to different power segments and standards. Below is a detailed list of the key specifications for our sensors:
| Series | Model | Package style | Certification/ | Rated current [mA] | Maximum current [mA] | Overcurrent | Operating | Accuracy % (25℃) | Applicable |
|---|---|---|---|---|---|---|---|---|---|
| SM Series | RCMU101SM1-2AI |  | CE/UL | 300mA | 500mA | 20A | -40℃~105℃ | 2 | 0–4kW |
| RCMU101SM2-AI |  | CE/UL | 300mA | 500mA | Customize | -40℃~105℃ | 2 | 0–4kW | |
| RCMU101SM3-6AI |  | CE/UL | 300mA | 500mA | 42A | -40℃~105℃ | 2 | 0–10kW | |
| RCMU101SM3-6FI | | CE/UL | 510mA | 850mA | 42A | -40℃~105℃ | 2 | 0–10kW | |
| RCMU101SM4-2AI |  | CE/UL | 300mA | 500mA | 20A | -40℃~105℃ | 2 | 0–4kW |
| Series | Model | Package style | Certification/ | Rated current [mA] | Maximum current [mA] | Overcurrent | Operating | Accuracy % (25℃) | Applicable |
|---|---|---|---|---|---|---|---|---|---|
| SN Series | RCMU101SN-2P12C-5NB |  | CE/UL | 1020mA | 1700mA | 70A | -40℃~105℃ | 2 | 0–15kW |
| RCMU101SN-2P2A-5N |  | CE/UL | 300mA | 500mA | 20A | -40℃~105℃ | 2 | 0–4kW | |
| RCMU101SN-2P12A-5N | | CE/UL | 300mA | 500mA | 70A | -40℃~105℃ | 2 | 0–15kW | |
| RCMU101SN-2P4A-5S |  | CE/UL | 300mA | 500mA | 32A | -40℃~105℃ | 2 | 0–7kW | |
| RCMU101SN-3P6A-5S |  | CE/UL | 300mA | 500mA | 42A | -40℃~105℃ | 2 | 0–36kW | |
| RCMU101SN-3P6C-5S | | CE/UL | 1020mA | 1700mA | 42A | -40℃~105℃ | 2 | 0–36kW |
| Series | Model | Package style | Certification/ | Rated current [mA] | Maximum current [mA] | Overcurrent | Operating | Accuracy % (25℃) | Applicable |
|---|---|---|---|---|---|---|---|---|---|
| SN Series | RCMU101SN-3P16A-5S |  | CE/UL | 300mA | 500mA | 80A | -40℃~105℃ | 2 | 30–50kW |
| RCMU101SN-4P16A-5S |  | CE/UL | 300mA | 500mA | 80A | -40℃~105℃ | 2 | 0–80kW | |
| RCMU101SN-4P16C-5S | | CE/UL | 1020mA | 1700mA | 80A | -40℃~105℃ | 2 | 0–80kW | |
| RCMU101SN-A-5S |  | CE/UL | 300mA | 500mA | Customize | -40℃~105℃ | 2 | / | |
| RCMU101SN-C-5S | | CE/UL | 1020mA | 1700mA | Customize | -40℃~105℃ | 2 | / | |
| RCMU101SN-D-5S | | CE/UL | 1500mA | 2000mA | Customize | -40℃~105℃ | 2 | / | |
| RCMU101SN-G-6C |  | CE/UL | 3000mA | 5000mA | Customize | -40℃~105℃ | 1.5 | / | |
| RCMU101SN-4P28G-6C |  | CE/UL | 3000mA | 5000mA | 150A | -40℃~105℃ | 1.5 | 0–150kW | |
| RCMU101SN-3P28G-6C |  | CE/UL | 3000mA | 5000mA | 150A | -40℃~105℃ | 1.5 | 0–150kW |
How to Choose Your RCMU？
Table of Contents
1. Understanding Your Application Needs
2. Key Features: Accuracy and Precision
3. Bandwidth and Response Time: Ensuring Real-Time Monitoring
4. Operating Conditions: Temperature and Environmental Resilience
5. Power Supply Considerations: Ensuring Compatibility
Understanding Your Application Needs
Choosing the right Residual Current Monitoring Unit (RCMU) starts with understanding the unique requirements of your application. The first consideration is the environment in which the sensor will operate. Applications such as electric vehicle (EV) charging stations, photovoltaic (PV) systems, and energy storage systems (ESS) each have their own set of challenges that must be addressed.
For EV charging stations, the sensor must be able to detect leakage currents, especially from DC systems, which require precise and quick responses to prevent electrical hazards.
Photovoltaic systems require leakage current detection and ground fault monitoring, especially under varying environmental conditions.
Energy storage systems need sensors capable of handling high currents and ensuring reliable fault detection for long-term safety.
Assessing your needs in terms of environment, current types (AC/DC), and the safety standards required will help narrow down your options.
Key Features: Accuracy and Precision
Once you have identified the application, the accuracy and precision of the sensor are crucial. The primary function of an RCMU is to detect small leakage currents, often in the microampere range, and provide a signal that ensures your system can respond appropriately.
Magtron’s iFluxgate® technology is highly regarded for its extremely low zero drift and high sensitivity. This ensures that even very small leakage currents can be detected with accuracy.
Accuracy is typically expressed as a percentage of the full-scale output. For instance, RCMU sensors offer an accuracy of ±1%, which is essential in safety-critical applications like battery management systems (BMS) or solar inverters.
High precision in monitoring helps prevent false alarms and ensures that maintenance actions are only taken when absolutely necessary, saving time and costs.
The accuracy and precision of an RCMU ensure reliable fault detection and system protection, especially in applications requiring exact measurements, such as EV charging stations and solar inverters.
Bandwidth and Response Time: Ensuring Real-Time Monitoring
Another vital factor is the bandwidth and response time of the sensor. These attributes directly impact the ability of the sensor to react to sudden changes in current, which is critical in high-speed systems such as electric vehicle chargers and power inverters.
Bandwidth defines the range of frequencies the RCMU can detect. For example, a sensor with a bandwidth of 700Hz to 10kHz ensures that rapid fluctuations in current are accurately detected.
Response time refers to how quickly the sensor can react when leakage current exceeds the threshold. Magtron’s RCMUs offer fast response times, ensuring that the system can disconnect the power quickly to avoid damage or safety risks.
High bandwidth and rapid response times are especially crucial for applications where system uptime and safety are paramount. For example, DC fast chargers and solar inverters need sensors that can quickly detect any deviation and trigger the necessary protection protocols.
Operating Conditions: Temperature and Environmental Resilience
RCMUs are often deployed in harsh environments where temperature fluctuations and other external factors can affect performance. As such, temperature stability and the sensor’s ability to withstand environmental conditions are critical factors to consider.
Magtron’s RCMUs are designed to operate in extreme temperatures ranging from -40°C to 105°C. This broad range makes them suitable for outdoor applications such as solar power installations, which are exposed to extreme weather conditions.
The sensors are also resistant to humidity, dust, and corrosive environments, ensuring long-term performance in industrial and energy sector applications.
For applications such as electric vehicle charging stations and energy storage systems, where the equipment might be exposed to direct sunlight or fluctuating temperatures, selecting an RCMU with a high tolerance to these environmental factors is essential.
Understanding the environmental conditions and operational stresses your sensor will face can help you select the most durable and reliable option.
Power Supply Considerations: Ensuring Compatibility
RCMUs require a stable power supply to function correctly. Different models might have varying voltage and current requirements, and ensuring compatibility with your system’s power source is crucial.
Magtron RCMUs typically require +5V power and can have current consumption ranges from 300mA to 3000mA depending on the model and application.
For low-power systems, sensors with a lower power consumption are more suitable, while high-current systems such as industrial or grid-connected systems may require models that handle higher current draws.
Choosing the appropriate power supply ensures that the sensor operates efficiently, without causing strain on the power system or affecting overall system performance.
Self-Check Function: Enhancing Reliability
Magtron’s Self-Check Function is a unique feature that ensures the sensor is working correctly at all times. This automatic diagnostic feature checks for potential malfunctions, reducing the need for manual inspection and preventing undetected faults.
Self-checking is particularly beneficial in mission-critical applications, such as solar inverters, energy storage systems, and EV charging stations, where sensor failure can lead to significant risks.
This function can also help in reducing maintenance downtime since users will be alerted if the sensor requires service or recalibration.
By selecting a model with this feature, you ensure continuous, uninterrupted monitoring and improve the reliability of your safety systems.
Choosing the Right Model for Your Application
After evaluating the key factors above, you’ll need to select the specific model of RCMU that best fits your system requirements. Magtron offers a range of sensors suited for different power capacities and applications.
RCMU101SM series: Ideal for smaller systems such as single-phase inverters in residential solar applications.
RCMU101SN series: Suited for industrial-scale applications and three-phase inverters used in large solar farms or energy storage systems.
RCMU101SN-4P series: Specifically designed for use in three-phase systems with higher current requirements, such as commercial solar inverters or large-scale EV charging stations.
Selecting the appropriate model depends on factors such as current sensing range, system size, and application type. The right choice will ensure optimal performance, safety, and long-term reliability of your electrical system.
Get A Quote
Quality & Certifications
Magtron ensures that all our Analog RCMUs meet the highest quality standards, providing reliable performance across all applications.
Our products are UL certified, ensuring compliance with global safety standards, including UL 1741, UL 508, and UL 94-V0.
The VDE 0126-1-1 certification ensures the products meet the specific safety requirements for photovoltaic systems.
Compliance with IEC 60950-1 and IEC 61000-4-5 standards ensures that our products meet rigorous electrical safety and electromagnetic compatibility (EMC) requirements.
All products are RoHS compliant, ensuring they are free from hazardous substances.
These certifications reflect our commitment to delivering high-quality, safe, and reliable products for a wide range of applications, from solar inverters to EV charging stations.
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.
Related Products
Current Sensing
High-Voltage Switching
Electrical Safety
Type B RCMUs and integrated RCD modules for complete AC/DC leakage current protection
Order & Payment
Most Popular Questions
It provides a continuous analog voltage signal that is proportional to the detected residual current. This allows for detailed monitoring, data logging, and predictive maintenance analysis.
They are ideal for high-end applications where understanding the trend of leakage current is critical, such as in smart EV chargers (e.g., for load balancing) and sensitive industrial equipment.
Yes, our Analog RCMUs are designed to detect both AC and DC residual currents, making them compliant with Type B leakage protection requirements.
The self-test function allows the system's microcontroller to periodically verify the health and functionality of the RCMU without needing external test equipment, ensuring continuous safety and reliability.
Send us a message
Get in Touch with Our Experts Today.
