Siemens – Limit Switches
Limit switches are used in automatic control circuits where mechanical positions have to be converted into electrical signals for controlling remote starters, contractors etc.
SICONT Limit Switches
Standards
The 3SE3 limit switches conform to the following standards:
Applications
Limit switches are used in automatic control circuits where mechanical positions have to be converted into electrical signals for controlling remote starters, contactors etc. The 3SE3 limit switches are ideally suited for control of machine tools, elevators, cranes, conveyors, gates, doors and various other applications.
Selection of limit switches
The open-type limit switches (degree of protection IP20) can be used in dry, dust-free environments, such as switchboards and closed cubicles.
If moisture and mechanical/thermal stresses (like shocks, impact) occur, the metal enclosed position switch (IP67) must be used.
A range of seven actuators cover a wide spectrum of duties and applications. They differ with respect to permissible actuation direction, actuation speed, form of actuating element and the advantageous combination of components. All the switches function independently of their installation position. Any of the 3SE3 limit switches must be actuated for atleast 0.1 sec., to ensure that the control command is transmitted. If the speed of the actuating element is given as V (in m/sec); the length I (in m) is calculated as I > 0.1 V For the mechanical life and switching frequency in the actuators, the same values apply as for the contact block. Undser no circumstances may the limit switch be used as a mechanical stop on a moving section of a machine
Technical Data
Open-type 3SE30 and s3SE31 metal enclosed types
Selection Table
Limit Switches with 2 contacts – open type
Limit Switches with 3 contacts and extension plunger – open type
Wide housing, 56 mm wide 2 contacts – closed type
Narrow housing, 40 mm wide 2 contacts – closed type
* 3SE 30/3SE 31 Open type and Metal Enclosed limit switches