The 100SP5T1B1M2QEH is a three-position rotary switch featuring an SPDT (Single Pole Double Throw) circuit with momentary function capability in position 3. The switch is rated for 2A at 250 VAC, 5A at 120 VAC, or 5A at 28 VDC, with silver-plated contacts and an epoxy seal for environmental protection. It operates reliably over a temperature range of -40°C to 85°C and provides 6,000 make-and-break cycles at full load with an insulation resistance of 1,000 megaohm minimum. The switch features a 1/4-40 UNS-2A threaded shaft with a keyway, panel-mount design with optional locking ring, and is commonly used in industrial control panels, instrumentation, and equipment requiring reliable switching with momentary action capability.