The 3SE2100-0E is a Siemens metal limit switch with slow-action contacts (1NO+1NC) and a roller lever actuator. It features 3 x M20 x 1.5 threading for mounting. However, this product has been discontinued since January 31, 2012, and its successor is the 3SE5122-0BE01.

Type: Position switch, metal-enclosed

Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)

Actuator: Roller lever

Threading: 3 x M20 x 1.5

Protection Class: IP67

Lifecycle: Discontinued since January 31, 2012 (Successor: 3SE5122-0BE01)