This surge protector guards your valuable serial devices from harmful transient surges.

- Model 500 Protects Pins 2, 3, 7 and 20 (Pin 1 & Shell Connected to Ground)
- Model 501 Protects Pins 2, 3, 4, 5, 6, 7, 8 and 20 (Pin 1 & Shell Connected to Ground)
- Combined Surge Handling Capacity of 2400W (Mdl 500) or 4800W (Mdl 501)
- One Male and One Female Connector