Surge arrester ABB OVRT23N40-275PQ 2CTB803973R1100 — Type OVRT23N40-275PQ, for TN/TT systems

ABB OVRT23N40-275PQ is a surge arrester designed to limit transient overvoltages in low-voltage TN and TT electrical systems. Installed at distribution boards or service entrances, this protective device diverts surge currents away from sensitive equipment, reducing the risk of damage from lightning-induced or switching overvoltages. The unit is intended for use where coordinated overvoltage protection is required to maintain continuity of service and protect connected loads.

Advantages

The OVRT23N40-275PQ provides fast response to transient overvoltages and stable performance under repeated surge events. It features a compact design suitable for DIN-rail mounting in consumer units and distribution cabinets, allowing straightforward integration into existing installations. The device is built to meet industry safety standards for low-voltage surge protection and offers reliable operation with low follow current characteristics to minimize thermal stress on the installation.

Suitable for

Key specifications

How to use

Install the surge arrester at the origin of the installation or directly in the distribution board according to local wiring practices and applicable regulations. Ensure correct connection to the system earthing (TN or TT) and observe manufacturer guidelines for line and earth conductors, clearances, and tightness of terminals. Verify correct coordination with upstream and downstream protective devices and, after installation, perform continuity and insulation checks before energising the circuit.

Recommendations

Position the device close to the main incoming supply and maintain short, low-impedance conductors between the arrester and the protected equipment. Periodically inspect the unit for signs of operation or damage and include surge protection checks in routine electrical maintenance to ensure continued effectiveness.