Safety devices like a GFCI or RCD try to protect humans from any current greater than 5 to 30 mA (0.005 to 0.03 Amps). Human muscles are paralyzed -- you cannot move an affected arm or leg -- at currents from 10 to 20 mA; as a result a victim may be unable to let go of a wire that is shocking him. At around 20 mA breathing is difficult. At about 75mA breathing stops. At 100 mA the heart fibrillates -- death is quick. At 200 mA you get severe musculature contractions and burning.