3RH1921-1DA11

The 3RH1921-1DA11 model from Siemens is a versatile auxiliary switch widely used in control circuits. Its structure includes a single Normally Open (NO) contact and a single Normally Closed (NC) contact, allowing it to perform diverse functions in automation applications. This switch features screw-type terminals, which facilitate straightforward wiring and secure connections.

Designed with robust construction, the auxiliary switch can withstand a surge voltage of 6 kilovolts, ensuring enhanced durability in environments with electrical spikes. Operationally, it performs well within a temperature range of -25 to 60°C in environments where condensation is not present, making it suitable for various industrial settings. The switch supports an output current rating of 10 Amperes, offering reliable function in controls.

Additionally, the device complies with an IP20 protection class, providing moderate protection against physical contact. Its extensive mechanical lifespan, rated for 10 million operations, alongside an electrical lifespan of 200,000 operations, underscores its reliability. The storage temperature range of -55°C to 80°C further enhances its usability in diverse conditions, particularly where storage before installation may vary.

This auxiliary switch mounts using a snap-on method for quick and easy installation. Weighing just 0.105 pounds (0.048 kilograms), it remains lightweight without compromising performance. It is compatible with solid, stranded, and finely stranded conductors. It can be used alongside specific Siemens contactors, including 3RT10, 3RT12, 3RT145, 3RT146, and 3RT147, making it a flexible choice for enhancing control circuit configurations.