The 3SE3100-1B is a position switch from Siemens, featuring metal-enclosed snap-action contacts with 1NO+1NC configuration. However, this product has been discontinued since August 24, 2005, and its successor is the 3SE5122-0CB01. 

Plunger Type: Plain plunger, stainless steel

Device Connection: 3x (M20x 1.5)

Rated Insulation Voltage: 500V AC / 600V DC

Rated Thermal Current: 10A

Short Circuit Protection: HRC fuse (10A)

Mechanical Endurance: 30 million switching cycles

Electrical Endurance (AC15): 30 million switching cycles with 3TH / 3TF contactors

Switching Frequency: 6,000 cycles per hour