The Phoenix Contact ZB 5,QR:FORTL.ZAHLEN 21-30 marker strip provides a simple and effective solution for identifying terminal blocks. This 10-section strip is vertically labeled with consecutive numbers from 21 to 30, ensuring clear and consistent identification. The white color enhances visibility, making it easy to locate specific terminals. It is commonly used in electrical panels, control cabinets, and other industrial settings where organized labeling is crucial for maintenance and troubleshooting. The marker strip is designed for use with Phoenix Contact terminal blocks, ensuring a secure and reliable fit.