Multiple-beam safety light barriers create a two-dimensional protection field which allows a varying detection capability and different protection field heights depending on the application requirement. Operating personnel benefit from greater flexibility for a variety of use cases, while the highest safety requirements—up to PL e, Cat. 4, and SIL 3 are reliably met. Additionally, redundant multiple tests in ongoing operation ensure increased plant availability. The sophisticated, narrow housing design along with a range of accessories also permits convenient installation.