DS EN 50152-1:2012 Railway Applications - Fixed Installations - Particular Requirements For Alternating Current Switchgear - Part 1: Circuit-Breakers With Nominal Voltage Above 1 Kv Pertains to single-pole and two-pole alternating current (a.c.) circuit-breakers which are: - for indoor or outdoor fixed installations in tractions systems, and - operated with an a.c. line voltage a