DC Surge Arrestor 40-80kA, 600V & 1000VDC | Onesto PV SPD

The Onesto BY7 DC Surge Protection Device is a DC-rated surge arrestor designed for solar PV arrays, battery storage systems and other DC distribution installations. It protects DC-side equipment such as inverters, charge controllers and combiner boxes from transient overvoltage caused by lightning strikes and switching surges. Available in 40kA, 60kA and 80kA discharge ratings, 2 or 3 pole configurations, and 600VDC or 1000VDC system voltages, it is a practical choice for solar installers and electricians sizing surge protection for a specific PV string voltage and array size.

• Application: DC-side surge protection for solar PV, battery storage and DC distribution systems
• Key specification: Choice of 40kA, 60kA or 80kA maximum discharge current
• System voltage: Available for 600VDC or 1000VDC PV strings
• Configuration: 2 pole or 3 pole versions
• Mounting: DIN rail installation for inverter rooms and combiner boxes

Key Features

• DC-rated construction suited to the continuous voltage and fault characteristics of solar PV and battery DC circuits, unlike standard AC-only SPDs
• Choice of 40kA, 60kA or 80kA discharge rating to match array size and lightning risk zone
• 600VDC or 1000VDC options cover both standard residential/commercial strings and higher-voltage commercial PV arrays
• DIN rail mounting for straightforward installation in combiner boxes and inverter rooms
• 2 and 3 pole versions to suit different DC array wiring configurations

Typical Applications

• Solar PV array DC-side surge protection
• Inverter and combiner box protection
• Battery storage system DC distribution protection
• Commercial and residential solar installations
• Off-grid and hybrid solar systems with exposed DC cable runs

Technical Specifications

What's Included

• 1 x Onesto BY7 DC Surge Protection Device (kA rating, pole configuration and system voltage as selected)

Please note: DIN rail, combiner box wiring, DC isolators, cabling and installation accessories are not included unless specifically listed above.

Installation & Compatibility Notes

• Confirm your PV array or DC system's maximum operating voltage (600VDC or 1000VDC) before ordering — a mismatch can affect protection performance.
• Confirm the required discharge current (kA) based on your installation's lightning risk zone and array size; contact Zisabo if you are unsure.
• Select the correct pole configuration (2P or 3P) for your DC wiring layout.
• Installation should be carried out by a suitably qualified solar installer or electrician.
• This is a DC-rated device — do not substitute a standard AC surge protection device on a DC circuit.

Warranty & Support

This product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms.

Zisabo supplies quality plumbing, pump, filtration and electrical products with practical support to help customers choose the correct item for their application. If you are unsure whether this product is suitable, contact us before ordering and our team will assist where possible.

Need help choosing? If you are unsure whether this product is suitable for your solar or DC system, contact Zisabo with your array voltage, required discharge current and pole configuration, and we will assist where possible.