Electric equipment for rolling stock: Part 1 general, Part 2 electrotechnical components, Part 3 DC circuit-breakers, Part 4 AC circuit-breakers, Part 5 HV fuses 600–3000 V DC.
Parts declared by products:
Part 1 specifies general service conditions and requirements for all electrical equipment installed in the main, auxiliary, control and signalling circuits of railway vehicles; it introduces a classification of equipment types and procedures for temperature tests.
Part 2 gives general rules for electrotechnical components (apparatus). Part 3 covers DC circuit-breakers rated up to 3000 V DC, while Part 4 covers AC circuit-breakers supplied from the traction system at voltages according to IEC 60850 (industrial circuit-breakers to IEC 62271-100 are outside its scope).
Part 5 covers high-voltage fuses for main and auxiliary circuits rated 600–3000 V DC and AC auxiliary circuits up to 1500 V. The series applies to rolling stock and is the product standard for electromechanical apparatus, as opposed to EN 50155 for electronic equipment.
A fuse declared to IEC 60077-5 has its breaking capacity verified through test cycles for 600–3000 V DC vehicle circuits; industrial fuses to IEC 60269 are not tested under these conditions.
EN 50155 covers electronic equipment, while IEC/EN 60077 covers electrical equipment for rolling stock: electrotechnical apparatus (Part 2), DC and AC circuit-breakers (Parts 3 and 4) and HV fuses for 600–3000 V DC (Part 5).
IEC 60269-1 states that fuses for rolling stock require separate supplementary requirements. IEC 60077-5 specifies test cycles for 600–3000 V DC vehicle circuits that are not included in the IEC 60269 series.
