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   Home   Dynamic Brake Resistors Resistor Over Voltage Protector (MUB)


Radial Grid Dynamic Brake Assembly

Dynamic Brake Hatch Assembly

Force Cooled Roof Mounted DBR Assembly With Short Hood

Forced Cooled Roof Mounted DBR (Electric Locomotive)

Vertical Type DBR

Natural Cooled Roof Mounted DBR

Resistor Harmonic Filter

Resistor Over Voltage Protector (MUB)

Pre-Charge Resistor

Inverter Protection Resistor (IPR)

Crowbar Resistor

Oil Cooled Resistor

Resistor Over Voltage Protection (MUB) ( For WAP-7 / WAG-9 3-Phase Electric Locomotive DU120107002 replaceable with ABB*** Part No. 3EHN424091P0025 )


Resistor Over Voltage Protection called MUB is provided in the over voltage limitation circuit which is one of the main constituent of traction power convertor (Machine Room Equipment).

If the capacitance of DC-link capacitor bank is not sufficient to prevent the DC-link from sudden and inadmissible high transient over voltages, the over voltage protection (limitation) resistor is almost immediately connected across the DC link by the firing of a GTO in the Oil Cooled Valve Set with one arm for the Motor Convertor and one arm for the MUB Valve Set.

The MUB-circuit also serves to discharge the convertor DC-link if the vehicle is put out of operation (Powering-down) the temperature of the MUB Resistor is monitored in the control electronics by a thermal module.



Technical Details of DU120107002

Peak Surge Current

1705 A


2800 VAC

Grid Resistance @ 20oC

2.5 Ω ± 5%

Power Rating

1000 kWs



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