1. The 3SU1900-0BB31-0AA0 is a pushbutton switch from Siemens. It is a 22mm operator LED illuminated selector switch from their 3SU1 series.
2. This pushbutton switch is rated for up to 6A/600V and has two contact blocks with two NC/NO contactor contacts. It has a chrome-plated plastic housing and is UL, CSA and ENEC approved.
3. In addition, this switch comes with an LED light source in blue, green and orange, and it has an IP65/IP67 protection rating when in use. It also has a short-circuit protection feature, reverse connection protection and is suitable for fastening with locking nut.