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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

Inverter Protection Resistor (IPR) and Crowbar Resistor for WDP-4/WDG-4 Locomotives
DU120117006 replaceable with DLW Pt. No. 40082110, DU120116005 replaceable with EMD** Pt. No. 40082111 )


Power parts with in the Inverter can be damaged as a result of over voltages, power supply failures, or other faults. Therefore, an extensive protection system should be there to reduce the likelihood of damage to the inverter. For this reasons, Each Thyristor Control Cabinet (TCC) is provided with a built in protection system called IPS (Inverter Protection System).

The purpose of the IPR (Inverter Protection Resistor) is to dispose of DC link energy more gracefully in the event of a soft crowbar, firing incident. One Resistor per Thyristor Control Cabinet is required. For TCC-1, the IPR is mounted on its long hood side outside wall which is actually an inside wall for the Main Generator room. The cage housing IPR-1 also includes two Damping Resistors which are connected in parallel with the L456 DC Link Reactor located in the Main Generator room. This function is to assist L456 in the reduction of power oscillations on the DC Link, especially in braking mode.



Technical Details of DU120117006

Resistance value @ 20oC


Nominal Voltage

2800 V


150 A

Energy Dissipation for 1.1 sec

3.4 MJ

Technical Details of DU120116005

Resistance value @ 20oC


Nominal Voltage

2700 V


400 A

Energy Dissipation for 1.1 sec

3.0 MJ



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