The OPB840W51Z is a high-performance slotted optical switch from OPTEK Technology. It features an 890nm emitter and an NPN phototransistor output, making it perfect for a wide range of applications. With a slot size of 0.375" wide and 0.315" deep, this optical switch provides precise and reliable detection. It also comes with 24"/26AWG wire connections, ensuring easy integration into your system. Whether you need to detect objects or control machinery, the OPB840W51Z is an excellent choice.