3SE5 Limit Switches, Modular Units The SIRIUS 3SE5 limit switches provide the dependable performance required in everyday industrial applications thanks to their modular, consistent design and wide choice of variants and operating mechanisms. The standard design and function of the limit switches not only make it easy to select the right switch but also enable quick and easy installation, wiring and maintenance. The SIRIUS 3SE5 is designed for safety applications up to Category 4 according to ISO 13849-1 (EN 954-1) when you select the right product and use them properly in conjunction with fail-safe evaluation units such as the 3TK28, ASISafe, SIMATIC or SINUMERIK. Enclosure sizes Open-type position switch IP20 (3SE5 250-*****) Plastic enclosures according to EN 50047, 31 mm wide, IP65, 1 cable entry (3SE5 232-***** & 3SE5 234-*****) Plastic enclosures according to EN 50041, 40mm wide, IP66/IP67, 1 cable entry (3SE5 132-***** & 3SE5 134-*****) Plastic enclosures, 50 mm wide, IP66/IP67, 2 cable entries (3SE5 242-*****) Metal enclosures according to EN 50047, 31 mm wide, IP66/IP67, 1 cable entry (3SE5 212-***** & 3SE5 214-*****) Metal enclosures according to EN 50041, 40mm wide, IP66/IP67, 1 cable entry (3SE5 112-*****) Metal enclosures, 56 mm wide, IP66/IP67, 3 cable entries (3SE5 122-*****) XL metal enclosures with 4 to 6 contacts, 56 mm wide, IP66/IP67, 3 cable entries (3SE5 162-*****) Enclosures with an ambient temperature to -40°C (3SE5 ***-*****-1AJ0) Enclosure versions With contact blocks with two or three contacts (screw terminals) designed as slow-action or snap-action contacts; the slow-action contacts also with make-before-break (refer to tech. data) Optional LED status display (3SE5 ***-1K*** & 3SE5 ***-1L***) With M20 ´ 1.5 connection thread or mounted 4 or 5 pole M12 connector socket (refer to tech. data) Versions with increased corrosion protection (3SE5 **...