Littelfuse® Ground Fault Current Transformer, Series: SE-CS30, 70 mm Window, 600:1 Ratio, 600 VAC Insulation Level, 3% at 0.06 VA Accuracy, 50 to 400 Hz, -67 to 140 deg F Temperature, Threaded Mount, 5.43 in H x 4.76 in W x 2.21 in D,