MZB series Zener diode barriers are designed to limit excess energy before it reaches hazardous area. Removable terminals have channels as small as 6.3mm wide to consume minimal panel space. Series features bussed power feed and offers both relay and solid-state switch models. Each channel is fitted with two stages of pulse-tested Zener diodes and terminating resistor. If electrical fault occurs, diodes limit voltage available to hazardous area circuits, while series resistance limits current. Fuse in circuit ruptures if excess energy exceeds design criteria for loop.