Power Protection: How DC Disconnector Switches Safeguard Photovoltaic Systems

2024-06-13 | Product Related

What is a DC disconnect switch?

 

DC disconnect switch, also known as a DC isolator switch, is an electrical device used in a photovoltaic (PV) system to safely disconnect a direct current (DC) circuit. It is an important safety component in solar installations to isolate the DC power supply from the rest of the system during maintenance, troubleshooting or emergencies, avoiding dangerous accidents and ensuring safe operation.

 

How do DC disconnect switches protect PV plants?

 

Preventing Accidental Access to DC Power:

● DC disconnect switches serve as a crucial safety measure to prevent accidental access to DC power when working on photovoltaic systems. By cutting off the input from the solar panels and inverters, these switches ensure that technicians can safely handle wiring and DC terminals without risk of electrocution.

● Additionally, disconnecting the DC power source helps protect the inverter and other backend equipment from damage that could occur due to inadvertent exposure to live electrical components.

 

Safety during Maintenance:

● Safety during Maintenance: PV plants require periodic maintenance, which may involve tasks such as cleaning solar panels, inspecting wiring, or servicing equipment. Before performing any maintenance work, it's essential to isolate the DC power source to prevent electric shock and other hazards. 

● DC disconnect switches allow technicians to safely de-energize specific segments of the PV system, ensuring that workers can perform their tasks without risk.

 

Emergency Shutdown:

In the event of a fire, electrical fault, or other emergencies, rapid shutdown of the PV system is critical to mitigate risks and prevent further damage. DC disconnect switches enable quick deactivation of the DC power source, cutting off electricity flow to the affected areas. This helps prevent fires from spreading and allows emergency responders to safely address the situation.

 

Addressing Potential Backflow Hazards:

● Many inverters lack internal electrical isolation, increasing the risk of backflow from the AC side to the DC side during maintenance or fault conditions.

● DC disconnect switches provide a physical means of isolating the DC power source, effectively preventing backflow and reducing the risk of electrocution hazards. By physically interrupting the flow of DC power, these switches help ensure the safety of maintenance personnel and protect against equipment damage.

 

 

What are the features of Onesto DC disconnector switches?

 

Type: Din Rail Mounting / Panel Mounting / With IP66 Waterproof Box

-No. of pole: 2P, 2+2P, 4P

-Rated voltage: 300V, 500V, 600V, 800V, 1000V, 1200V DC

-Designed for DC applications, rated current range 16A/25A/32A

-Rated insulation voltage: 1000V

-Rated impulse withstand voltage: 8kV

-Utilization category: DC-21B / DC-PV1 / DC-PV2

-Comply with IEC60947-3

 

 

 

 

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