SIOV metal oxide varistor interface module, 8 channels common connect. Continuous maximum working voltage: 275VAC(RMS) / 350VDC. Breakdown voltage(at 1mA): 430V, Clamping voltage: 710V(50A), Transient peak current: 4500A. Ease of connection with the use of screw connection terminal blocks. High quality FR-4 fiber glass PCB.