ULDCR25 www.vishay.com Vishay Draloric Compact Metal Plate Power Resistor FEATURES • 2000 kJ pulse load capability • Typical temperature rise below 300 K for single pulse at specified pulse current • Extremely robust and compact design • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 APPLICATIONS • Industrial • Alternative energy • Load dump resistor in wind turbines • Discharge resistor for bulk capacitors The ULDCR25 belongs to Vishay’s Ultra Load Dump Crowbar Resistor series. This ruggedized product family is especially designed to absorb and withstand short pulses of enormous loads and is therefore an excellent choice for energy dumping applications in the fields of industry or alternative energy. TECHNICAL SPECIFICATIONS DESCRIPTION Resistance Resistance tolerance Temperature coefficient ULDCR25 0.8 ± 10 % + 1030 ppm/K Pulse energy Ep (1) 2000 kJ Pulse current Ip (1) 1000 A Inductance < 15 μH Note (1) Rectangular pulse t = 2.5 s, recovery time between 2 pulses t > 90 min at operation in unforced convection at 60 °C ambient temperature. i r APPLICATION INFORMATION The impact of the pulse current Ip for the duration ti generates a typical temperature rise against the local ambient temperature in the active material of the resistor. As long as the given pulse energy Ep is not exceeded, the temperature rise stays below 300 K. In case of natural convection at 60 °C ambient temperature the ULDCR25 needs more than 90 min to cool down back to the ambient temperature level. Operation in forced convection shortens the advisable minimum cooling time until the next pulse load. The resistors do not feature a limited lifetime when operated at the specified parameters. Overheating will not automatically destroy the resistor. Repetitive or permanent exceedance of the load values may cause a change of the crystal structure, the oxidation behavior and the temperature coefficient of the resistive material though. Revision: 27-Mar-15 Document Number: 21042 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 ULDCR25 www.vishay.com Vishay Draloric PART NUMBER AND PRODUCT DESCRIPTION Part Number: ULDCR258007KA0LX00 U L D C R 2 5 8 0 0 7 K A 0 L X 0 0 TYPE RESISTANCE TOLERANCE TCR HOUSING PACKAGING CODE SPECIAL ULDCR25 3 digit value 1 digit multiplier K = ± 10 % A= + 1030 ppm/K 0 = IP00 LX = loose pack, without quantity 00 = Standard 2 digit code = customized version MULTIPLIER 7 = *10-3 Product Description: ULDCR25 R80 10 % +1030 IP00 LX ULDCR25 R80 TYPE 10 % RESISTANCE +1030 TOLERANCE TCR IP00 LX HOUSING PACKAGING CODE Note • The product can be ordered using either the PART NUMBER or the PRODUCT DESCRIPTION. ELECTRICAL CONNECTION Two M10 - bolt screws serve as electrical connections. Their dimensions and positions are shown in the corresponding drawing on the next page. The cylindrical, 30 mm high insulators feature a M10 - thread of 9 mm tap depth. The table below contains the relevant electrical and mechanical parameters. The positions of the standoff insulators are shown in the technical drawing on the next page. ASSEMBLY The mounting positions of the resistor are horizontally regular as well as horizontally or vertically hanging. Therefore the ULDCR00 is equipped with six fiberglass reinforced polyester polyglas mass standoff insulators. PACKAGING Each resistor is packed in a cardboard box. Single samples are delivered as individual packets. Bigger lot sizes will additionally be fixed on euro-pallets. STANDOFF INSULATORS HEIGHT (mm) DIAMETER (mm) WRENCH SIZE (mm) THREAD TAP DEPTH (mm) MAX. STUD TORQUE (Nm) LEAKAGE STRENGTH (1) (kV) BREAKDOWN VOLTAGE (1) (kV) FIRE BEHAVIOUR 30 30 30 M10 9 43 8 20 UL94-V0 Note (1) The test of insulating materials were executed according the terms of VDE 0303-21 03/1999/DIN EN 60243-1 03/1999. RELATED PRODUCTS • For a comprehensive overview of all available ULDCR designs refer to the selector guide (www.vishay.com/doc?48002). • For stainless steel power resistors, refer to the VSGR series (www.vishay.com/doc?21032). Revision: 27-Mar-15 Document Number: 21042 2 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 ULDCR25 www.vishay.com Vishay Draloric DIMENSIONS MODEL L (mm) L1 (mm) W (mm) W1 (mm) W2 (mm) H (mm) H1 (mm) H2 (mm) H3 (mm) H4 (mm) MASS (kg) ULDCR25 566 ± 2 536 ± 1.5 190 ± 2 160 ± 1.5 60 ± 0.5 112 ± 2 55 ± 1.5 74 ± 1.5 30 ± 0.5 20 ± 1 23.5 ± 0.5 Note • The inscription 000A denotes the place of the serial number of the ULDCR25. Revision: 27-Mar-15 Document Number: 21042 3 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. 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Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21 conform to JEDEC JS709A standards. Revision: 02-Oct-12 1 Document Number: 91000