The BR20M-TDTL-C is a photoelectric sensor that detects the presence or absence of objects using light, typically infrared or visible light, depending on the model.

The TDTL in the model number suggests it may be a through-beam type sensor, where the sensor and reflector are placed opposite each other, and the sensor detects when the light beam is interrupted by an object.

C likely refers to a compact design, making it suitable for use in environments where space is limited.

Common applications include conveyor systems, packaging lines, and robotic systems, where object detection is critical for process automation, counting, or safety monitoring.