Siemens 3SE03-BR1 Rotary Limit Switch

Siemens 3SE03-BR1 is a metal modular limit switch with a side-rotary actuator designed for position sensing in industrial automation and machine-control applications. This 3SE03 family device features 2 poles with 2 normally open and 2 normally closed contacts (2NO+2NC) and a compact side-rotary operating head; the BR1 variant uses a 1/2" NPT threaded opening for mounting. It is rated for up to 600 VAC or 300 VDC and a current of 0.1 A, making it suitable for control circuits that require multiple switching paths in one compact unit. The modular plug-in construction supports easy field wiring and field-installable accessories; lever options are typically purchased separately to tailor actuation to the specific machinery. Common applications include conveyor and packaging line controls, automated manufacturing equipment, and general position-detection tasks where reliable, multi-pole switching in a compact housing is needed.