Surge Protective Device ABB OVR T1‑T2 3N 12.5‑275s P QS SPD Kombi T1+2 12.5kA pro Pol. TT/TNS 3P

ABB OVR T1‑T2 3N 12.5‑275s P QS is a combined Type 1+2 surge protective device designed for three‑phase TT and TNS systems. It provides coordinated protection against lightning impulses and switching surges, with an impulse current rating of 12.5 kA per pole and a protective operating range up to 275 V (s). The device is intended for installation in distribution boards to protect connected electrical equipment and reduce service interruptions caused by transient overvoltages.

Advantages

The device integrates Type 1 and Type 2 protection stages in a single modular unit, simplifying installation and saving panel space. With a 12.5 kA impulse current capability per pole, it manages high-energy lightning surges while its voltage range coverage ensures compatibility with common low-voltage three‑phase systems. Designed for coordinated backing with downstream protection, the unit helps limit the transfer of surge energy to sensitive equipment and supports reliable operation of distribution boards.

Suitable for

Key specifications

How to use

Install the surge protective device inside the distribution board on a standard DIN rail, following local electrical codes and the manufacturer's installation instructions. Connect the device to the three phase conductors and neutral as required for a 3N configuration and ensure proper earthing/PE connections for effective surge diversion. Verify that upstream switching and protective devices are compatible and that wiring cross‑sections and protective devices are sized appropriately for the installation environment.

Recommendations

Use this combined Type 1+2 device in conjunction with correct earthing arrangements and coordinated downstream protection. Periodically inspect the device and the distribution board for signs of operation or damage after major storms or electrical events, and replace the unit if indicators show it has operated or if protective performance is compromised.