Description

The ABB S261C25 is a 1+N pole Type C miniature circuit breaker rated at 25 A and 240 V AC, part of ABB’s System pro M compact S261 series designed specifically for circuits requiring simultaneous disconnection of both the line and neutral conductors in single-phase installations. The 1+N format provides protection equivalent to a 1-pole MCB while also opening the neutral conductor simultaneously, satisfying the requirements of TN-S and TT distribution systems where neutral isolation is mandated by the installation design or applicable wiring regulations. The Type C tripping characteristic provides instantaneous magnetic trip for fault currents between 5 and 10 times the rated current, appropriate for circuits with moderate inrush currents, including motor feeders, transformer-fed circuits, and fluorescent lighting systems.

Compliant with IEC 60898-1 and EN 60898-1, the S261C25 is rated at 240 V AC single-phase with a 6 kA short-circuit capacity, providing comprehensive overload and short-circuit protection for final circuits in residential, commercial, and light industrial installations. The 1+N design in a compact 2-module width provides an efficient solution for boards requiring neutral switching without the space penalty of a standard 2-pole device. The narrow profile is particularly advantageous in high-density consumer units and distribution boards where circuit count and space are both at a premium.

The S261C25 is compatible with ABB’s S200 series accessory range, enabling integration of auxiliary contact blocks, alarm contacts, and remote operating releases where required. It is widely specified by electrical contractors and designers in Irish and European residential and commercial installations where TT earthing systems, PME concerns, or specific regulatory requirements mandate the disconnection of the neutral conductor alongside the line on branch circuits. The S261 series addresses this requirement in a compact, DIN rail-mounted format fully consistent with ABB’s well-established S200 product family.