Surge protection device (SPD) for CAN-bus and associated DC power. Available for 12V and 24V operation. Clamps 3kA 8/20μs surges to +33% of nominal voltage. Clamps over-voltages to +33% of nominal voltage also, but will blow one of the fuses pretty quickly.
This is the bare-board (OEM) version of the module. Same electronics is also available with an outdoor IP66 glass-fiber reinforced (GRP) enclosure, either as standard gray box or antistatic ATEX compliant box.