3RH1921-1EA11

The auxiliary switch, designated as 3RH1921-1EA11, is manufactured by Siemens and falls under the SIRIUS series. This switch is engineered to handle operational currents up to 10 A and is optimized for a control voltage of 24 V DC. With an impressive surge voltage resistance capacity of 6 kV, it ensures reliability during voltage spikes. The unit is characterized by its IP20 protection class, making it suitable for specific indoor applications.

In terms of physical attributes, the switch measures 80 mm in height, 10 mm in width, and has a depth of 71 mm, with a total weight of 0.049 kg. It features a snap-on mounting method for easy installation. The insulation voltage is rated at 500 volts, providing a solid safety margin for various electrical environments.

The mechanical endurance of the 3RH1921-1EA11 indicates a service life that can reach up to 10 million operating cycles, emphasizing its durability. For auxiliary contacts, this switch features one normally closed and one normally open connection, ensuring versatility in various applications. It also has impressively low contact reliability, with only one fault observed per 100 million contacts at specified test conditions (17 V, 1 mA). The unit accommodates connectable conductor cross-sections ranging from 0.5 mm² to 2.5 mm², providing flexible wiring options.