Hello
We designed this Snubber Circuit with this varistor in parallel but we have a problem in a small load. Even when the relay is disconnected, a small current is flowing. For example, when connecting a phone charger, the phone screen keeps turning on and off.
The varistor is Hongzhi Elec 7D471K
The resistor is 2.2 ±5% 1W ±350ppm/°C Axial,3.3x9.2mm Carbon
The capacitor is 100nF ±10% 275VAC 10 Through Hole,P=10mm Suppression Capacitors

I think the problem is with the capacitor and maybe I need a smaller one to increase the impedance and limit the current flow or schematic problem.

 

Welcome to AAC!
With 230V 50Hz mains and a low impedance load you get about 7mA per 100nF of capacitance. A smaller cap will indeed reduce the current but also reduce the snubber effectiveness.

 

You could perhaps add a capcitor across the load. A 100nF will halve the remnant voltage across the load.

 

Hey guys,
Thanks for your reply. We tried to connect the snubber in the load and till now everything seems to be okay. This also solved our resetting problem of ESP8266 in our PCB.

 

What is the load?
If it is just a resistor then you don't need a snubber.

If the load is inductive, you can neutralise it by putting a snubber across the load with R = series resistance of inductor and C = L/R^2