Blue Sea Systems 4 Circuit Terminal BlockThe Blue Sea Systems Terminal Block features a closed black design that completely insulates power from the mounting surface. Features: Each screw pair is one isolated circuit; Jumpers allow creation of common circuits; Phenolic base material; Nickel-Plated brass bus material; Specifications: Circuits: 4; Maximum Voltage: 600V AC/DC; Continuous Rating: 30A; Screw Size: #8; Weight: 0.17 lbs;