AC/DC SPD

AC/DC SPD for Solar PV, EV Charging and Electrical Distribution

ETEK supplies AC and DC surge protective devices for low-voltage electrical systems, solar PV arrays, inverters, combiner boxes and EV charging equipment. AC SPD products are used on the grid or distribution side, while DC SPD products are designed for photovoltaic strings, DC combiner boxes and inverter DC inputs.

For solar PV systems, common DC SPD ratings include 600V, 800V, 1000V, 1200V and 1500V DC. Type II PV DC SPD devices help discharge transient overvoltage caused by lightning-induced surges or switching events, reducing the risk of damage to inverters, PV strings and downstream protection equipment.

ETEK offers wholesale and OEM supply for AC/DC surge protectors, including replaceable cartridge designs, visual status indication and options for electrical panel builders, solar installers, EV charger manufacturers and distributors.

AC SPD vs DC SPD

AC SPD and DC SPD are not interchangeable. AC surge protectors are designed for alternating-current distribution systems, while DC surge protectors must interrupt and discharge surges in DC circuits where there is no natural zero crossing. Solar PV and battery systems should use DC-rated SPD devices matched to the maximum system voltage.

FAQ

What is an AC/DC SPD?

An SPD, or surge protective device, limits transient overvoltage in electrical circuits. AC SPD is used on AC distribution systems, while DC SPD is used on DC systems such as solar PV strings, combiner boxes and inverter inputs.

Can AC SPD be used for DC circuits?

No. AC SPD and DC SPD have different voltage ratings and protection designs. DC circuits require DC-rated surge protective devices suitable for the system voltage and application.

What SPD is used for solar PV systems?

Solar PV systems commonly use Type II DC SPD devices on the PV string or combiner box side, with voltage ratings such as 600V, 1000V or 1500V DC depending on the PV system design.

Where should a DC SPD be installed in a PV system?

A DC SPD is typically installed in the PV combiner box or near the inverter DC input to protect equipment from surge voltage between PV strings and the inverter.

What does 1500V DC SPD mean?

A 1500V DC SPD is designed for photovoltaic systems with a maximum DC voltage up to 1500V. The SPD voltage rating must match or exceed the PV array voltage requirements.

Can ETEK supply AC/DC SPD products wholesale?

Yes. ETEK supplies AC and DC surge protective devices for distributors, panel builders, solar PV projects and EV charging equipment manufacturers, with wholesale and OEM options available.