* Three-stage SPD-20mA surge protection device meets standard protection against power surges, voltage surges and disturbances with three stages of protection. * Housed in a din rail panel mount case with a protected earth ground. * In order to work properly, it is important to have a good connection in E terminal to solid earth ground. * Unknown electronic device failure and misbehave in controller units might be avoided by using SPD-20mA Features: * Protection provided by high energy MOV and TVS * Replaceable modular design, DIN Rail compatible base * All types of 20mA current loop devices, Also works for HART interface Where to Use: *Noisy industrial lines like DC inductive load switching *Industrial power panels *Solar plants *Gas stations