SPD

Selecting the wrong surge protective device type is one of the more common and more expensive specification errors in low-voltage installations. The device may work, the installation may pass inspection, and the system will still be under-protected for the actual risk it faces — because Type 1, Type 2, and Type 3 devices are not […]

Follow a DC surge protection circuit through normal operation, a surge and recovery, and see why protection modes and DC fault disconnection need their own design.

Most solar DC distribution boxes (DCDBs) are fitted with a Type 2 DC surge protection device (SPD), rated for 8/20 µs surge currents; a Type 1+2 DC SPD is required when the DC circuit is exposed to direct lightning strikes or the site has no external lightning protection system. This guide explains how to decide […]

How to wire and install a Type 2 DC surge protection device on a PV system: terminal connections, parallel wiring, backup fuse or MCB, earthing and common mistakes.

Surge arresters clamp transient overvoltage; circuit breakers clear overloads and short circuits. Compare functions, applications and coordination.

A surge protector limits transient overvoltage; a fuse interrupts overcurrent. Learn the differences, combined-device limits and checks for coordinated protection.