Telergon 250A 3P Switch Disconnect for On-Load Disconnection AC22a AT 500V. Rated breaking current of up to 8 times the rated operational current, with the ability to establish and support short circuit currents up to 100kA. Uninterrupted duties in extreme tropic and polar conditions, as well as the polluted environment of any industrial process. Protection against accidental over voltages in equipment connected between phase and neutral (our standard 3P+N) with advanced switched neutral pole (early make – late break).