The ABB GSE201L 1P+N 16A is a single-pole with neutral (SPN), single-module width miniature circuit breaker (MCB) from ABB's System Pro M compact GSE series. It is designed for the final circuit protection of single-phase electrical installations, providing combined protection against overloads and short-circuits for both the phase and neutral conductors (though the neutral pole may have a different breaking capacity or be unbreakable in some designs).