PV DC Isolator

A PV DC Isolator (also known as a Solar DC Disconnector) is a safety switch specifically designed to interrupt the Direct Current (DC) power flow from solar panels. It is a critical safety component that allows for the safe isolation, maintenance, and emergency shutdown of the PV array. By disconnecting the high-voltage DC circuit, it protects technicians from electric shock and prevents potential electrical fires during installation or servicing.

DC and AC electrical arcs behave differently, requiring specialised design:

DC Arc Suppression: Extinguishing a DC arc is more challenging than an AC arc (which naturally crosses zero 50-60 times per second). KRIPAL PV DC Isolators are engineered with advanced arc-chamber technology and specific contact materials to safely and rapidly quench the DC arc, ensuring reliable circuit interruption.

Voltage & Current Ratings: They are rated for the higher DC voltages typical of solar arrays (e.g., up to 1000V DC or 1500V DC), which exceed standard AC voltage requirements.

Our isolators strictly adhere to international PV standards and carry renowned certifications, including CE and TÜV. These are not just labels; they are proof of rigorous independent testing for safety, durability, and performance. Using a certified isolator is non-negotiable for system safety, insurance compliance, and long-term reliability, mitigating the risk of DC arc faults and component failure.

Typically, two isolators are installed in a grid-tied system for complete safety:

Array-Side Isolator: Located between the solar panels and the inverter. This allows the DC current from the PV array to be safely isolated before it reaches the inverter.

Inverter-Side Isolator: Mounted directly next to the inverter, providing a local disconnection point.

Our PV DC Isolators are built to withstand decades of exposure to the elements:

• High IP Protection: Featuring ratings like IP65, making them completely dust-tight and protected against powerful water jets, ideal for outdoor mounting.
• UV-Resistant & Corrosion-Resistant Housing: The robust enclosure prevents degradation from prolonged sun exposure and resists corrosion.
• Wide Temperature Tolerance: Engineered to operate reliably in extreme high and low ambient temperatures.

No. It is extremely dangerous to open a DC Isolator under load during daylight hours when the panels are generating high-voltage DC power. 

Always follow safe working procedures. The isolator is designed to be operated when the circuit is de-energised or, for specific load-break models, according to the manufacturer's strict instructions. We recommend that all installation and maintenance be performed by qualified and certified solar technicians.

A substandard DC isolator can fail to extinguish the arc when switched under load, leading to a sustained DC arc fault. This can cause melting, fire, and catastrophic system failure. KRIPAL's certified isolators, with their robust arc-quenching chambers and proven safety design, are your primary defense against these risks, ensuring the long-term safety and integrity of your solar energy system.