open type or metal enclosed, is selected according to the conditions existing at the point of installation. In a dry, dust-free environment, such as _ in switchgear cubicles, the open-type limit switch can be used {degree of protection : IP 20). If moisture and mechanical stresses (e.g. shocks, impact) occur or if there is additional thermal stress (e.g. hot swarf), the metal-enclosed limit switch (degree of protection: IP 67) must be used.

The available installation space determines the dimension (40mm width or 56mm width) of the limit switch to be selected.

Actuators:

To cover a wide range of duties, a range of actuators is offered. These actuators differ with respect to permissible direction of actuation, speed of actuation & type of actuating element.

Hence, proper selection of actuator heads is necessary.

Selection Guidelines:

• • SICONT 3SE3 limit switches must be actuated for at least 0.1s, to ensure that the control command is transmitted.
• • The actuators & contact blocks are interchangeable between the two enclosures namely 40mm and 56mm.
• • For lateral direction of actuation, the respective-approach and trailing angles of the actuating element should be of equal magnitude.
• • Under no circumstances may the limit switch be used as a mechanical stop on a moving section of machine.