LV1 17.book Seite 2 Freitag, 26. Januar 2007 11:33 11 Siemens AG 2007 SENTRON Switching and Protection Devices Switch Disconnectors Introduction Overview Type 3LD20 3LD21 3LD22 3LD25 3LD27 3LD28 3LD main and EMERGENCY-STOP switches from 16 A to 125 A Rated uninterrupted current I u at 35 C ambient temperature A 16 25 32 63 100 125 Rated operational voltage U V 690 690 690 690 690 690 e AC-3 motor load switches Operational switching of individual motors At 220 ... 240 V kW 3.0 4.0 5.5 11.0 18.5 22.0 At 380 ... 440 V kW 5.5 7.5 9.5 18.5 30.0 37.0 At 660/690 V kW 5.5 7.5 9.5 15.0 22.0 30.0 AC-23A main control switches, maintenance switches Frequent, but not operational switch- ing of single motors At 220 ... 240 V kW 4.0 5.0 6.0 11.0 18.5 22.0 At 380 ... 440 V kW 7.5 9.5 11.5 22.0 37.0 45.0 At 660/690 V kW 7.5 9.5 11.5 18.5 30.0 37.0 Switch versions Front mounting Central -- -- Four-hole Floor mounting Central -- -- Four-hole Distribution board mounting Molded-plastic enclosures Metric screwed glands Switch accessories 4th pole (neutral conductor) (leading switch-on, delayed switch-off) N terminals PE-ground terminals Auxiliary contact elements 1 NO + 1 NC Available -- Not available Siemens LV 1 2007 17/2 17LV1 17.book Seite 14 Freitag, 26. Januar 2007 11:33 11 Siemens AG 2007 3KA, 3KE, 3LD Switch Disconnectors 3LD Main Control and EMERGENCY-STOP Switches up to 125 A General data Overview 7 3 8 2 6 3 1 5 4 1 4th contact (N conductor) 2 N or PE/ground terminal, continuous 3 Auxiliary switch 1 NO + 1 NC 4 Rotary operating mechanism, red/yellow 5 Rotary operating mechanism, black 6 Front plate, English/German 7 Terminal cover, three-pole 8 Terminal cover, one-pole Application The 3LD switches are used for switching main and auxiliary In EN 60204-1 (VDE 0113 Part 1), main control switches are circuits, but also for switching induction motors and other loads calledmains isolating device, while EMERGENCY-STOP during maintenance and repair work. switches are termeddevices for emergency shutdow. Maintenance personnel can protect themselves against They are manually operated switch disconnectors according to unauthorized startup with padlocks (up to three can be fitted). IEC 60947-3/VDE 0660 Part 107 (EN 60947-3) and comply with the conditions for switch disconnectors. 3LD main control and EMERGENCY-STOP switches are approved according to UL 508. The 3LD can be used as ON-OFF switch EMERGENCY-STOP switch Main control switch according to EN 60204-1 * You can order this quantity or a multiple thereof. Siemens LV 1 2007 17/14 17 NSG0 00112a