TSP058B-TSP320B bidirectional thyristor surge protector Product Features: 1. Protects by limiting voltages and shunting surge currents away from sensitive circuits 2. Designed for telecommunications applications such as line cards, modems, PBX, FAX, LAN,VHDSL 3. Helps meet standards such as GR1089, ITU K.20, IEC950, UL1459&50, FCC part 68 4. Low capacitance, High surge (A, B, C rating available), precise voltage limiting, Long life