Rapid Shutdown Device Manufacturer

Experience heightened solar safety and efficiency with HIITIO Rapid Shutdown. Our state-of-the-art device limits electrical range, ensuring rapid and dependable system shutdown during emergencies.


Rapid Shutdown Device

HIITIO is a first-tier manufacturer located in Hangzhou, China, dedicated to providing you with cutting-edge solar solutions. Our mission is to drive the development of clean energy by focusing on innovation, quality, and reliability. 

HIITIO component-level photovoltaic shutdown has the component-level rapid shutdown function, and upon the rapid shutdown mechanism is triggered, the voltage between any two points of the system will not exceed 80V within 30s, and this meets NEC 2017 690.12 standard. This scheme, based on power line carrier communication.

  • Meet NEC 2017 690.12 standard
  • Simple and convenient installation and operation
  • 25 years of design life and compatibility with photovoltaic module

Features of HIITIO Rapid Shutdown Device

Rapid De-energization

Facilitate the quick shutdown of PV systems, reducing DC voltage to a safe level within seconds during emergencies or when maintenance is required.

Compliance with Safety Standards

Designed to meet and comply with relevant safety standards and codes, ensuring adherence to industry regulations.

Ease of Installation

Engineered for simple integration into solar PV systems, allowing for straightforward installation and compatibility with various setups.

Reliability and Durability

Emphasize robustness and reliability, ensuring long-term performance and safety in diverse environmental conditions.


Compatible with different PV system configurations and components, enabling seamless integration with inverters and other system parts.

Safety for Emergency Responders

Prioritize safety for emergency responders by quickly de-energizing the system, minimizing potential electrical hazards during firefighting or other emergencies.

Monitoring and Contro

Some RSDs offer monitoring capabilities, allowing users to remotely monitor and control the status of the shutdown devices, enhancing system management and safety protocols.


Reliable Quality​

Unmatched reliability, adaptable performance, and peace of mind in safeguarding your electrical systems.


Low Minimum Order Quantity from 100 Pcs to make it easier for you to access our products.

Fast Delivery

Implement streamlined processes and logistics to ensure that your orders are delivered promptly.

Factory Capability

Dedicated team of 200+ staff with peak efficiency, seamless coordination, and unmatched quality control.

Perfect Service

We deliver a comprehensive service package, guaranteeing your satisfaction, safety, and ongoing support.

All you should know about Rapid Shutdown Device (RSD)

What is a Rapid Shutdown Device?

A Rapid Shutdown Device is a critical component in solar power systems designed to quickly and safely shut down the electrical output of a solar array. Its primary purpose is to enhance the safety of solar installations, especially in emergency situations or when maintenance work is required.

The device is typically used in photovoltaic systems and is responsible for rapidly de-energizing the solar panels to mitigate electrical hazards. This is particularly important during emergencies such as fires, where a swift shutdown can help reduce the risk of electrical shock for first responders and ensure the safety of individuals and property.

The functionality of a Rapid Shutdown Device is often integrated into solar inverters or implemented as a separate device within the solar array. It adheres to relevant safety standards and regulations, and its use is crucial for compliance with electrical and building codes in many jurisdictions.

What are Key components of a rapid shutdown system?

1. Rapid Shutdown Device (RSD)

The RSD is a type of Module-Level Power Electronics (MLPE) or microinverter installed on the backside of solar panels. Equipped with technology capable of rapidly shutting down and reducing the voltage output of the entire solar system, it complies with photovoltaic rapid shutdown regulations. An example is the Tigo TS4-A-F or 2F, which is one of our MLPEs that specifically adheres to rapid shutdown requirements. Tigo offers various MLPE options compliant with rapid shutdown regulations.

2. Initiator

The role of a Rapid Shutdown Initiator is just as its name implies. This device typically exists in the form of an emergency stop (e-stop) button within the inverter. Rapid shutdown can usually be initiated in two ways: manually (via an electronic stop button) or automatically (from the loss of power from the grid).

3. Inverter

Within the rapid shutdown system, you’ll need an inverter. The inverter is a device that converts the electricity generated by solar panels into usable energy for your home (for more information on this process, please refer to our previous blog posts). Many rapid shutdown initiators are housed within inverters.

These three components are known as Photovoltaic Rapid Shutdown Equipment (PVRSE). They are devices used within rapid shutdown systems to lower voltage to safe levels. National Electrical Code regulations in the United States stipulate that PVRSE and PVRSS must be UL certified to achieve the purpose of rapid shutdown.

Why is the RSD so important?

Rapid shutdown provides a secure method for firefighters or solar installation personnel to stop or reduce the voltage and current from a photovoltaic (PV) array, allowing them to work safely and effectively, avoiding electrical hazards. Shutting down or reducing the voltage at the module level on the roof minimizes or eliminates the risk of electric shock for firefighters, which may result from high voltages associated with solar modules.

How to choose a right RSD?

Regulatory Requirements: 

Understand and adhere to local regulations, codes, and standards governing rapid shutdown systems for PV installations. 

System Compatibility: 

Ensure that the chosen rapid shutdown solution is compatible with your existing PV system components, including inverters, modules, and wiring. Compatibility is crucial for seamless integration and proper functionality.

Type of Technology: 

Determine whether you require module-level power electronics (MLPE), such as module-level rapid shutdown devices (MLRSD), or microinverters equipped with rapid shutdown capabilities. Assess the advantages and limitations of each technology based on your system requirements.

Two typical system schemes

According to different actual applications, there are two typical system schemes:

As shown below, “Application I” applies to a single series system. The controller has 3 input and output ports, including one for receiving power from AC terminal and another two preinstalled with photovoltaic cable and connector (one male and one female), and the only thing to be done is to connect the photovoltaic string.

In case of AC power-off at the grid-connected end of the inverter or active disconnection of air switch in the controller, the component-level shutdown can be realized.

Typical System Schemes​

Which sites must be complied with Rapid Shutdown Devices?

In the United States, National Electrical Code regulations mandate the necessity of Rapid Shutdown Systems (RSS) for all new rooftop installations, encompassing both residential and commercial buildings. Additionally, buildings that have conductors entering spaces not specifically designed for housing photovoltaic system components also require this system. 

Consequently, virtually all new rooftop installations in the United States necessitate either module-level power electronics or microinverters equipped with rapid shutdown capabilities.

Installation of Rapid Shutdown Device

Step 1. Installation of the PV rapid shutdown

As shown in the figure, clamp the button of the breaker into the frame of the photovoltaic module

button of a rapid shutdown device

Step 2. Connection of input and output lines

Connect the input line of photovoltaic shutdown with the output line of component junction box;
Replace the output line of component junction box with the output line of photovoltaic shutdown, and include it into the rear side after sequenced connection in series.

Connection of input and output lines 1

Connection of input and output lines 2

Some precautions

The installation must be completed completely and only by professional technicians, who must:

  • Have received special training;
  • Have read the Manual completely and understood relevant safety precautions in operation;
  • Have a good knowledge of relevant safety regulations of the electrical system.

Applications of Rapid Shutdown Device

Emergency Situations

Rapid shutdown systems are vital during emergency situations, such as fires or accidents, where immediate de-energization of the PV system can reduce potential electrical hazards for first responders or maintenance personnel.

Maintenance and Service

During maintenance or service activities on the solar PV system, rapid shutdown systems allow for quick de-energization of the system, ensuring the safety of technicians working on or around the equipment.

Regulatory Compliance

Many regions have regulations mandating the use of rapid shutdown systems in solar installations. Compliance with these regulations is essential for ensuring safety standards and legal requirements.

Residential and Commercial Buildings

Fast shutdown systems are required in both residential and commercial settings where solar PV systems are installed on rooftops or within the building structure to mitigate potential electrical risks during emergencies.

Enhanced Safety Protocols

Beyond regulatory requirements, some installations prioritize rapid shutdown systems to enhance overall safety protocols and mitigate risks associated with live electrical circuits in solar installations.

Remote Monitoring and Control

Fast shutdown systems sometimes incorporate remote monitoring and control features, allowing operators or system managers to monitor and initiate shutdown remotely, enhancing overall system management.

Integration with Fire Safety Measures

Rapid shutdown systems are crucial for integration with fire safety measures, ensuring that firefighters can work safely around solar installations during emergencies.


A good connection between the metal clips on the HS-F housing and the aluminum frame of the module is critical for proper grounding.

After installing the HS-F onto your PV panel and checking for the 1Vdc reference voltage for each “PV/HS-F assembly,” a string of 6-30 panels must be connected together and voltage verified to be in the range of 6-30 Vdc.At least one string verified to be in the 6-30 Vdc range must be connected to an open MPP input of the inverter.

FOB Shanghai/Ningbo, for other delivery terms please contact us.

We accept various payment methods, including [list accepted payment methods such as Telegraphic Transfer(T/T), Letter of Credit(L/C), PayPal, credit/debit cards, etc. You can choose the one that is most convenient for you during the checkout process.

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