MSS120004 is a single-pole double-throw (SPDT) slide switch with silver (Ag) contacts designed for instrumentation-grade applications. The switch features a vertical actuator configuration and operates with break-before-make contact timing, ensuring safe switching transitions. It is rated for 300 mA at 125 Vac or 20 mA at 20 Vdc, with an electrical endurance of 15,000 operations and an operating temperature range of -20°C to +85°C. The switch is packaged in trays and is suitable for applications requiring reliable, precision switching in control systems and instrumentation equipment.