Box Ya.02 U1 6BS.391.432 contains: contactors electromagnetic fast-acting KMBE-3.13 U2, designed to protect the power circuit in the braking mode; current sensors, designed to measure the value of currents in the power circuit; contactors, designed to control the heating of the car interior; thyristors T171-320, providing regulation of the excitation current of traction motors; current relays RE 12, providing protection of the excitation windings of traction motors from overloads during braking; boxing protection equipment ( reed relays 1RE.008.01 U2 and 1RE.008 U2).
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