Keno SH-75 DCAC Connection Box with DC+AC Surge Protection, 1000V, Type 2, 1x PV String, 1x MPPT

The Keno SH-75 DCAC connection box is a specialized solution designed to enhance the safety and reliability of photovoltaic installations. This unit integrates both DC and AC surge protection within a single, robust housing, specifically engineered to handle systems operating up to 1000V. By providing Type 2 surge protection for one PV string and one MPPT input, it effectively shields sensitive solar equipment from voltage spikes caused by atmospheric discharges or grid fluctuations, thereby extending the operational lifespan of the entire solar power system.

Advantages

The primary benefit of the Keno SH-75 DCAC connection box is its comprehensive protection capability, which combines DC and AC surge suppression in one compact device. This integration simplifies the installation process by reducing the number of individual components required in the electrical cabinet. The high-quality Type 2 protection ensures that the system remains resilient against transient overvoltages, maintaining consistent performance and reducing the risk of costly equipment damage. Its durable construction is tailored for professional solar setups, offering a reliable interface for efficient energy management and circuit safety.

Suitable for

• Residential solar power installations with a single MPPT input.
• Small-scale commercial photovoltaic systems requiring reliable surge protection.
• Systems utilizing a single PV string configuration.
• Upgrading existing solar setups to meet modern electrical safety standards.

When it may not be suitable

This connection box is not suitable for systems that utilize multiple PV strings or require multiple MPPT inputs, as it is specifically configured for a single-string setup. Additionally, it should not be used in installations where the operating voltage exceeds the 1000V threshold, as this would compromise the safety and functionality of the surge protection components.

Key specifications

• Maximum operating voltage: 1000V DC
• Surge protection type: Type 2
• Number of PV strings: 1
• Number of MPPT inputs: 1
• Integrated protection: DC and AC surge protection

How to use

The Keno SH-75 DCAC connection box should be installed by a qualified electrician in accordance with local electrical regulations. The unit is typically mounted between the solar panels and the inverter. The PV string cables are connected to the DC input terminals, while the AC output is connected to the inverter or the main distribution board. Ensure that all connections are tightened to the specified torque settings to prevent overheating and ensure a secure electrical path. Proper grounding of the surge protection device is essential for its effective operation.

What to consider before purchase

• Verify that your solar system configuration matches the 1x PV string and 1x MPPT input requirement.
• Ensure the system voltage does not exceed the 1000V limit.
• Confirm that the installation environment is suitable for the enclosure's protection rating.
• Consult with a certified professional to ensure compatibility with your specific inverter model.

Usage recommendations

Regularly inspect the surge protection status indicators on the device to ensure that the protection modules are still functional. If the indicator changes color, the surge protection cartridge may need to be replaced to maintain system safety.