The 154E is an economical open bracket DC filter choke designed for channel mount installation in high voltage power supply filtering applications. It features an inductance of 20 Henries measured at the rated DC current of 20 mA, with a resistance of 1666 ohms and a maximum operating voltage of 300 volts DC. The unit has a tolerance of 15% on both inductance and resistance, minimum 5-inch long leads, and weighs 0.25 pounds with C2H mounting dimensions. The 154E is ideal for power supply filtering where stable inductance characteristics and high resistance values are required, offering economical performance for demanding DC filtering requirements.