Multifunctional Three phase monitoring relay Monitor Phase loss & undervolatge L1,L2,L3=380-440 VAC, 380..440 VAC (L-L) Measuring range, Start-up delay: 500ms Tripping delay: 150ms Time range, 1 N/O contact, 380-440 VAC (L-L) Control supply voltage 1 Width 22.5 mm modules