Siemens 3RG7842-4DK00 Safety Light Curtain Transmitter

Siemens 3RG7842-4DK00 Safety Light Curtain Transmitter is the sending half of Siemens’ SIGUARD 3RG7842 family, a Type 4 safety device designed to guard machine access points in industrial automation. This 1200 mm-tall transmitter pairs with a compatible receiver (for example, 3RG7842-4DK01) to form a complete light curtain that monitors a defined protected zone and initiates a safe stop when the beam is interrupted. As part of the SIGUARD line, both transmitter and receiver variants offer diagnostic displays to aid setup and fault diagnosis, supporting straightforward commissioning and ongoing troubleshooting. The 3RG7842 family is intended for standard Type 4 safety applications, including conveyors and presses, where reliable guarding of hazardous zones is required and compliance with IEC 61496-1/2 is expected. Designed for integration with Siemens safety relays to create a coordinated safety circuit, this transmitter provides compatibility with the corresponding receiver and other 3RG7842 devices, enabling scalable protection across mid-size guard areas.