ABB S203P-Z6 MCB 3P Z 6A 480Y/277, current lifecycle

The ABB S203P-Z6 is a 3-pole miniature circuit breaker (MCB) with a Z-curve trip characteristic, rated at 6 A and 480Y/277 V. The Z-curve is designed for protection of sensitive electronic loads and semiconductor circuits where low inrush tolerance is required — it trips faster than a B- or C-curve on short-circuit but still allows for minimal overload margin. The 480Y/277 V rating means it is suitable for three-phase wye systems with line-to-neutral voltage of 277 V, common in North American commercial and industrial panels.