Installation contactor, hum-free, 25A, 4 openers, 230V. Contactors, hum-free, built in accordance with EN 61095, DIN0637-3. The contactors are equipped with a direct current magnet system that ensures hum-free continuous operation and low switching noise. The control is carried out with alternating voltage via an integrated diode bridge. The contactors also contain: a protective circuit against overvoltage, a protective circuit to limit interference voltage peaks in the magnet system, contact position display through display window, sealable with sealing cap (accessory), auxiliary switches (accessory) can be flanged on. Integrated labeling field. Contact protection according to DIN0106 Part 100