While designing a surge suppressor, I came up with an online schematic where they use a differential mode choke and a common mode choke.
I put one toroid choke coil as the differential mode choke.
Here's my schematic:
The input and output should be close to 250V max at 50Hz (AC). For the varistors however, I have seen most surge protectors use 14D471K.
Is it possible that the inductors induce some spikes to the circuit connected to OUT N and OUT L if loads are connected and disconnected while the circuit is on?
Also, I put two 0.1 ohms resistor in series to the output. It seems as if the varistors have some resistance even though it acts as a short circuit. Is it worth putting the resistors series to the output?
EDIT
The circuit should be connected directly to 250VAC @60Hz. The output I expect is also similar, but the max can go up to 300V. 14D471K suits this perfectly.
When it comes to the the surges that I want it to protect against, is the power line surges coming from various disturbances. It should also protect against Electro-Magnetic Interference.
On the most extreme side, I want it to protect with high surges from lightning - although this is a huge challenge both to test the circuit with such spikes and also protect them, but it should at least somehow manage protect devices.
