The ULV4F2BSS311 is an illuminated SPDT pushbutton switch designed for panel-mount control applications requiring visual feedback. It features a stainless steel actuator and housing with a red LED illumination ring, rated for 3A at 250VAC with silver contacts and cUL certification. The switch delivers 50,000 make-and-break cycles at full load with a mechanical life of 1,000,000 cycles, operates across -20°C to +55°C, and provides IP67 and IK10 ingress protection ratings. Key electrical characteristics include 1,000 MO minimum insulation resistance at 500VDC, 2,000 VAC dielectric strength, and 50 mO maximum contact resistance at 1A 12VDC. The LED operates at 20 mA 3V, with a 3.2 mm travel distance and 2.5 ± 1.0 N actuation force. This switch is ideal for industrial control panels, machinery interfaces, and sealed enclosures where durability and visual indication are essential.