The Phoenix Contact 3030271 jumper is designed for use with terminal blocks and ensures reliable continuity in electrical connections. It is compatible with various models including ST 4, STI 4, QTC 2.5, and UT 4, making it versatile for switchboard and serial terminal applications. This jumper is ideal for use in industrial and electrical applications where secure and efficient connection is essential. https://elecena.pl/product/28911680/phoenix-contact-3030271-jumper-for-st-4-sti-4-qtc-2-5-ut-4-utn-4 2025-06-06 https://elecena.pl/product/28911680/phoenix-contact-3030271-jumper-for-st-4-sti-4-qtc-2-5-ut-4-utn-4 2025-07-15