The M3539 protects devices connected to the DC bus. If the DC bus voltage reaches a predetermined point, such as 1500VDC, the M3539 SCRs will limit the voltage from going any higher and shunt the energy through the field resistance.

Once the current drops below the M3539 SCR threshold, the unit turns off and prepares for the next spike. Multiple SCRs allow parallel load resistor connections.

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