... , overload protection, overcurrent protection, phase failure protection, current unbalance protection, earth fault/leakage current protection, short circuit protection, underload protection, external fault ... overtime√√Over load √ √Over current √ √Phase failure √ √Current unbalance √ √Short circuit √ √Earth fault √ √Under load √ √External fault √ √Leakage current optional optional Temperture ( PTC/ ...