SIOV metal oxide varistor interface module, 8 channels common connect. Continuous maximum working voltage: 30VAC(RMS) / 38VDC. Breakdown voltage(at 1mA): 47V, Clamping voltage: 93V(10A), Transient peak current: 1000A. Ease of connection with the use of screw connection terminal blocks. High quality FR-4 fiber glass PCB.