Moulded Case Circuit Breakers DU Series
About us Larsen & Toubro is a technologydriven company that infuses engineering with imagination. The Company offers a wide range of advanced solutions in the field of Engineering, Construction, Electrical & Automation, Machinery and Information Technology. L&T Switchgear, a part of the Electrical & Automation business, is India's largest manufacturer of low voltage switchgear, with the scale, sophistication and range to meet global benchmarks. With over five decades of experience in this field, the Company today enjoys a leadership position in the Indian market with a growing international presence. It offers a complete range of products including powergear, controlgear, industrial automation, building electricals & automation, reactive power management, energy meters, and protective relays. These products conform to Indian and International Standards. Switchgear Factory, Baroda Index Description Introduction Salient Features Technical Specifications IT Characteristics Curves Overall Dimensions Page o. 4
Introduction The DU Series, a new generation of MCCBs, stands out due to its stateoftheart design, contemporary userfriendly features, ergonomics, aesthetics and compactness. H/DU0 Series complies with the latest standards like IEC 947, E 947 & IS/IEC 947. The products conform to international standards, carry marking and are & CB certified. The range is specially designed for tropical conditions, ensuring reliable performance at high ambient and humid environments. The range can satisfy the most demanding system requirements. The DU Series, has a wide range of accessories, ensuring operational safety, reliability and versatility. Salient Features Technology Specially designed arc suction effect & speedo quench contact system o load line bias: Either side of MCCB terminal can be used as load and line* Ergonomic design & user friendliness Knob designed for better grip Color indication of O/TRIP/OFF* Current rating on the knob Overload adjustment from front* Easy O/OFF/RESET operations Wide variety of snap fit accessories* Compact Compact size Common depth throughout the range Suitable for side by side mounting Suitable for use in Distribution Board Internal Accessories Auxiliary contacts Trip alarm contacts* Combined Auxiliary + Trip alarm contacts* Shunt release Under Voltage release* External Accessories Direct & Extended ROM Spreader links Padlock is available (with ROM) SS Enclosure** GF module for earth fault protection Easy to Install 4mm door cutout* Optional DI rail mounting available** Safe to Use Finger proof terminals Lockable shroud on thermal knob to prevent unauthorized operation* marked range* Double Insulation: The internal accessories are housed in insulated casings to ensure first level of insulation. When the front cover is opened for the fixing of internal accessories, the MCCB is totally insulated ensuring the double insulation* * For H & DU0 P & 4P MCCBs ** For & H
Technical Specifications DU Series Technical Parameters Specification Type Designation H DU0 o. of Poles //4 /4 Rated Current I n (A) 16,0,,,40,0,6,80,0 0,,,40,0,6,80,0 0,1,1,00,0 Impulse withstand voltage U imp (kv) 6 Rated operational voltage U e (V) 41 Rated insulation voltage U i (V) 690 Operational frequency (Hz) 0 / Utilisation Category A Reference Temperature 0 0 C 40 C Operating Temperature C to + C 40V a.c. 6 6 I cu (ka) 41V a.c. 0V d.c (P in series) L/R<1 msec 0 1 6 1 00V d.c. (P in series) L/R<1 msec Rated Service S. C. Breaking Capacity (I cs) 0% of lcu Mechanical Life o. of operations 0000 0000 000 Electrical Life o. of operations 00 4000 000 IP Protection (from front side) Pollution Degree Type of Release Thermal Magnetic Terminal Capacity (without ) Fixed IP40 III Thermal Magnetic Fixed (9I n) Variable (0.8 1.0I n ) Cables with Lug ( mm ) 0 Link (mm) Overall Dimensions <17 <6 Width (mm) 7 7/7/0 /140 Height (mm) 16 Mounting Depth (mm) Weight (//4 Pole) (kg) 0.68 0.6/0.7/1 1.4/1.8
IT Characteristics Curves /H 000 00 0 Time in Seconds 1 0.1 0.01 0.001 1 1 Current multiples DU0 000 00 0 Time in Seconds 1 0.1 0.01 0.001 1 1 Current multiples 4
Pole Overall Dimensions Pole with 7 1. Pole H Pole, 4Pole Pole with 4Pole with Pole, 4Pole 1. 6.9 9 0 (4 pole) 7 ( pole) 9 17 86.1 6 61 Terminal 4. 116.4 For Pole MCCB, refer Pole dimensions. Spreader links are available as spare. It is recommended to use spreader links for enhancing termination capacity. Pole, 4Pole Pole with DU0 4Pole with Pole, 4Pole 18 16 14 16 7 1 16 14 16 8 11 1 11 171 19 4 7. 7 Screw M6 Terminal 7.4 Ø9 8 9 6 79.6 4 194. 17. 116.4 s s 0. 11 17 0.1 (P) 140 (4P) Spreader links are available as spare. It is recommended to use spreader links for enhancing termination capacity. 4. 7 4. 7 4 4 4 197 (P) 140 (4P) 64. 4 18 9.7 All dimensions are in mm
Panel Cutout Dimension H DU0 For Fixing the MCCB Use Screw M4x4 os. MF.4 Mounting Panel 70. 70. 1 6 47 11 46 9 9. 76. 48. Cutout 1 OR Cutout 16 141 8 4.6 8.6 46 eutral Pole Door Cutout Dimensions M4Ø. For Four Pole 8.8 ROM Mounting Dimension Direct ROM L L4 Type L L L4 L 1 L H 96. 8 44 7 Panel L Panel Cutout Breaker Mounting Holes DU0 96. 7 6. = Mounting Depth L/L = Panel Cutout L4/L = Breaker Mounting Reference Extended ROM MCCB Mounting Holes As Viewed From the Front References as per MCCB Mounting L L 4 Ø1 Ø76 Ø4 Panel Cut Details 7 Cut The Shaft to the Required Length = L L Type H DU0 169 169 L 119 119 L 7. 4. L 69. 81.7 L = Length of Shaft required for Panel Depth (mm) = Min. Panel depth (mm) All dimensions are in mm 6