Weidmueller WTR 4 STB BL

"WTR 4 STB BL" appears to be a product or technical term, possibly referring to a specific model or version. "WTR" could stand for "Water," "Wireless Transmission," or a related term, "STB" might refer to "Set-Top Box," and "BL" could denote "Black" or a feature code. Further context would clarify its meaning.