The RS-485 and 4-20 mA Surge Protectors are designed for low-voltage and bus applications in industrial instrumentation. Covering CAT A and CAT B types with surge capacities from 8 kA to 48 kA, this range provides reliable protection for analog 4-20 mA loops, field transmitters, and RS-485 bus systems, ensuring safe and continuous operation of critical process control and communication networks.