1000V DC Surge Protector Device

The SYS5-40P 1000V DC Surge Protector Device, supplied by China-based manufacturer Zhejiang Soutya New Energy LLC, is a 500–1000 V DC, T2-class SPD with 40 kA maximum discharge current and ≤3.9 kV voltage-protection level, designed to clamp lightning and switching surges in residential rooftop PV strings, small C&I solar plants and domestic battery-storage systems.

Application scenarios

1.Residential rooftop PV

Mounted on the DC side of 5–20 kW single- or three-phase string inverters, it clamps induced lightning and switching transients; the 3.9 kV protection level safeguards 600–800 V string insulation, while the IP20 DIN-rail housing fits inside a domestic distribution board.

2.Small C&I metal-deck solar plants

In 20–60 kW systems, one SPD per two strings is installed in the string combiner box. Remote-signal contacts are paralleled and wired to the inverter’s RS-485 port, sending “SPD failure” alarms to the owner’s mobile app and cutting onsite inspections.

3.Home hybrid PV-battery units

Between the 48 V/51.2 V battery stack and the 600 V DC bus of an all-in-one inverter, the SPD prevents switching surges generated by battery DC-DC stages from reflecting into PV modules.

4.Community DC chargers ≤80 kW

On the 750 V DC bus feeding the power modules, the SPD suppresses arcing surges caused by frequent plug/unplug cycles, protecting internal SiC MOSFETs and Hall sensors.

5.Telecom tower solar retrofits

A –48 V load shares the same earthing network with an 800 V PV bus; the SPD stops lightning traveling along feeder cables into the power shelter, keeping BBU and transport equipment on-air.

Technical Parameter

Note:T2 category SPD is primarily used in the main incoming cabinets of distribution systems.

Accessory device

Failure Isolation Device

The surge protector is equipped with a failure isolation protection device. When the protector breaks down due to overheating, this device can automatically disconnect it from the power grid while providing an indication signal. When the protector is functioning normally, the indicator window displays green; after failure isolation, the window displays red.

Alarm Remote Signal Device

The protector can be manufactured with remote signal contacts. This device includes a set of normally open and normally closed contacts. When the protector is functioning normally, the normally closed contact is engaged. If one or more modules of the protector fail, the contact will switch from normally closed to normally open, activating the normally open contact to send out a fault signal.

Wiring Diagram

Appearance and Installation Dimensions