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RC circuits (Resistor-Capacitor)
its role : Effective protection for circuits highly sensitive to "high frequency" interference. For use only in cases where the voltage is virtually sinusoidal. i.e. less than 5% total harmonic distortion. Voltage limited to 3 Uc max. and oscillating frequency limited to 400 Hz max. Slight increase in drop-out time (1.2 to 2 times the normal time).
Find below capture photo in order to choose the suitable RC circuit. You will choose depending on the current of the contactor and the supply voltage .