Siemens 3SE03-BT3 Limit Switch Roller Top Plunger

The Siemens 3SE03-BT3 Roller Top Plunger Limit Switch delivers precise, repeatable end-of-travel detection for industrial automation tasks across conveyors, packaging lines, and machine tools. This roller-top plunger actuator features a 2 NO + 2 NC contact configuration with a snap-action switching mechanism and a rugged metal enclosure rated IP65 for demanding environments. It provides a rated operational voltage up to 240 VAC / 250 VDC, and a current rating up to 6 A (AC-15) or 3 A (DC-13); mechanical life up to 10 million operations and electrical life up to 1 million operations. The unit is designed for panel or surface mounting and uses an M20 threaded cable entry, with an operating temperature range of -25°C to +85°C. Common applications include object detection on conveyor lines, position verification in packaging equipment, limit control in machine tools, and safe operation in material handling systems to prevent overtravel. For compatibility or retrofit considerations, common replacements include Siemens 3SE03-BT4 and Siemens 3SE5 112-0CE01.