SMA Solar SMA Nachruestsatz DC_SPD_KIT7_T1T2DC-Ueberspannungsableiter (Typ I+II)

Photovoltaic installations are exposed to lightning strikes and switching surges that can destroy inverters and cause costly downtime. The SMA Solar DC SPD Kit Type I+II is a retrofit surge protective device that safeguards the DC side of your solar system. It combines Type I and Type II protection in a single compact unit, diverting high-energy surges safely to ground and keeping your PV array operational.

Who is it for

This kit is intended for solar installers, EPC contractors, and system owners who need to upgrade existing SMA PV systems with robust overvoltage protection. It is ideal for commercial and utility-scale installations where inverter uptime is critical and where lightning activity or grid instability poses a real risk.

Main features

• Type I + Type II surge protection according to IEC 61643-11 and EN 50539-11
• High discharge capacity: 6.25 kA impulse current (10/350 µs) per pole, 40 kA max discharge (8/20 µs)
• Low voltage protection level (< 4.0 kV) for effective equipment safeguarding
• 3-pole Y-connection for DC+/DC-/PE configuration
• Visual status indicator: green (OK) / red (fault) for quick inspection
• Remote signaling via potential-free changeover contact for integration into monitoring systems
• DIN rail mounting for easy retrofit into existing inverter enclosures
• Wide operating temperature range: -40°C to +80°C
• IP20 enclosure suitable for indoor installation

Specifications

• Nominal DC voltage: 1000 V DC
• Max. continuous operating voltage (Uc): 1060 V DC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Max. discharge current (Imax): 40 kA (8/20 µs)
• Impulse current (Iimp): 6.25 kA (10/350 µs) per pole
• Voltage protection level (Up): < 4.0 kV
• Number of poles: 3
• Technology: Varistor-based (MOV)
• Mounting: DIN rail
• Operating temperature: -40°C to +80°C
• Enclosure rating: IP20
• Standards: IEC 61643-11, EN 50539-11
• Remote signaling contact: Yes (potential-free changeover)
• Application: Retrofit kit for SMA PV systems

Tips

For maximum protection, install the SPD as close as possible to the inverter DC terminals and keep cable lengths short. Verify that the existing DC disconnect and grounding system are in good condition. The remote signaling contact should be wired to the inverter's fault input or a central alarm system so that any SPD failure is immediately detected. Periodic inspection of the status indicator is recommended, especially after severe thunderstorms.