The SZ-ZM2 is a coil surge suppression unit designed for use with Fuji Electric SH series industrial relays. It provides varistor-based protection against voltage spikes and transient surges that occur during relay coil switching operations. The unit is rated for 24-48V AC/DC operating voltages and integrates seamlessly with standard SH-4 and SH-5 relay configurations. This optional accessory extends relay lifespan by protecting the coil from damaging overvoltage conditions, making it essential for applications requiring enhanced reliability in industrial control systems.