DIN EN 50526-1:2012-05

This European Standard applies to non-linear metal-oxide resistor type surge arresters without spark gaps designed to limit voltage surges on d.c. systems with nominal voltage up to 3 kV. The replaced standard EN 50123-5:2003 covers the cases of the old technologies of the gapped arresters with SiC resistors and of the low voltage limiters (LVL) with gaps. These technologies at present are superseded. The present standard deals with the new technologies of the gapless metal-oxide arresters and of the LV limiters for application in the electric railway d.c. fixed installations. While guidance for selection and application of SA and LVL is missing in the old standard, it is included in the third part of the new standard. It shall be noted that there is no standard available at the moment for surge arrester on rolling stock. The same electrical requirements apply for arresters on rolling stock, although other specific requirements shall additionally be taken into account. The responsible committee is Working Group AK 351.2.7 "Schaltgeräte" ("Switchgear") at Subcommittee UK 351.2 "Ortsfeste Anlagen" ("Fixed installations") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.