Have you ever wondered how to safely disconnect the high voltage DC current between solar panels and inverters? Enter the Solar DC Isolator Switch. Let’s dive deep into what it is and how to install it.

dc isolator switches


What is a Solar DC Isolator Switch?
A Solar DC Isolator Switch is a device that allows for the safe disconnection of DC current in solar power systems. It’s a crucial component that ensures the safety of the system and its users.DC Isolator Switches, also known as Rotary Isolator Switches, are mainly used for line isolation between photovoltaic modules and inverters in photovoltaic power generation systems. The inner core of the product can be installed inside the inverter as the inverter feeder control.DB (Rail Installation) DC Isolator Switch is installed inside the inverter, when the equipment detects the reverse connection or inverter internal fault, it will trigger the intelligent isolation switch, automatic break protection, so as to disconnect the DC input.

Importance of DC Isolator Switch in Solar Systems
The DC Isolator Switch plays a pivotal role in ensuring that high voltage DC currents can be safely disconnected, especially between solar panels and inverters. This ensures the safety and longevity of your solar installation.

Features of the DC Isolator Switch

Rated Voltage and Current
The DC isolation switch is suitable for power systems with a rated voltage of DC 1500V or below and a rated current of 32A or below.

MPPT Line Disconnection
This product can disconnect 1 – 2 MPPT lines simultaneously, making it versatile and efficient.

HVDC Transmission and Distribution Systems
The DC Isolator Switch is especially apt for isolating lines in HVDC transmission and distribution systems.


Types of Mounting

Rail Installation (DB)
This type of mounting is suitable for rails and is one of the most common methods used.

Panel Mounting (PM)
As the name suggests, this method involves mounting the switch directly onto a panel.

Door Interlock (DC)
This mounting type comes with a door interlock feature, ensuring additional safety.

Enclosure Options

Plastic Enclosure Box (EL)
A sturdy plastic enclosure that protects the switch from external factors.

Aluminum Enclosure Box (ELA)
A robust aluminum enclosure offering added durability and protection.

Voltage and Pole Specifications

Voltage Options
The switch can operate at voltages of 1000VDC or 1500VDC.

Pole Options
You can choose between 2P (2 Pole) or 4P (4 Pole) based on your requirements.

Step-by-Step Installation Guide

Safety Precautions
Always ensure the power is turned off before beginning the installation. Wear protective gear and ensure you’re working in a well-lit area.

Tools Required
Ensure you have all necessary tools like screwdrivers, wire strippers, and a multimeter.

Installation Process

  1. Choose the appropriate mounting type and secure the switch in place.
  2. Connect the wires as per the manufacturer’s guidelines.
  3. Ensure all connections are tight and secure.
  4. Test the switch to ensure it’s working correctly.

Benefits of Using a DC Isolator Switch
Using a DC Isolator Switch ensures the safety of your solar system, prolongs its lifespan, and allows for easy maintenance and troubleshooting.

Common Mistakes to Avoid During Installation
Always follow the manufacturer’s guidelines. Avoid over-tightening connections and ensure the switch is securely mounted.

Maintenance and Troubleshooting
Regularly inspect the switch for any signs of wear or damage. If you encounter any issues, consult the manufacturer’s manual or seek professional help.

Installing a Solar DC Isolator Switch is a crucial step in ensuring the safety and efficiency of your solar power system. By following the guidelines mentioned above, you can ensure a smooth installation process and prolonged system life.


  1. What is the primary purpose of a DC Isolator Switch?
    It allows for the safe disconnection of DC current in solar power systems.
  2. Can I install the switch myself?
    While it’s possible, it’s always recommended to consult or hire a professional for installation.
  3. How often should I check the switch for maintenance?
    It’s advisable to inspect the switch every 6 months.
  4. What’s the difference between 2P and 4P?
    2P refers to 2 Pole and 4P refers to 4 Pole. The choice depends on your system’s requirements.
  5. Are there any safety precautions I should be aware of?
    Always turn off the power before installation and wear protective gear.