The IDEC part HE1G-21SM is an electromechanical switch that is designed to enable switch functionality. It features a normally closed (N.C.) single-pole, single-throw (SPST) configuration, allowing for the control of electrical circuits. This switch has a current rating of 2A, making it suitable for a range of applications. With its reliable and durable construction, the HE1G-21SM offers consistent performance and longevity.