Wirewound Resistor with Thermal Cut-offs Wirewound Resistor with Thermal Cut-offs Type: ERU5T Discontinued ■ Features ● ● ● ● ● Accurate fusing characteristics Low cost and easy handling Space saving design Excellent anti-surge characteristics RoHS compliant ■ Recommended Applications ● Switching regulators, video adapters, safety circuits ■ Explanation of Part Numbers Product Code Fusing Resistors 1 2 3 4 5 6 7 8 9 10 & 3 6 5 # , 3 Element Code Power 5 5 W type Code T Style Style Radial Insertion Type Code B C Thermal Cut-offs Voltage Current Temp. 250 V 2A 134 °C 250 V 2A 145 °C Resistance Tolerance Code Tol. J ± 5% K ±10 % Standard Resistance Tolerance 10 ? : J <10 ? : K Resistance Value The first two digits are significant figures of resistance and the third one denotes number of zeros following. Decimal point is expressed by R as 6.8=6R8 ■ Ratings Code Power Rating (W) Current Rating (A) Thermal Cut-off Resistance Range Standard Quantity (Ω) (pcs.) (°C) B 1.6 2 134 0.18 to 680 500 6.5 C 1.8 2 145 0.18 to 680 500 6.5 Power Derating Curve For resistors operated in ambient temperatures above 25 °C, power rating shall be derated in accordance with the figure on the right. Mass (Weight) [g/pc.] 120 25 °C Rated Load (%) 100 80 60 40 5TB 5TC 20 90 °C 0 –40 –20 0 20 40 60 80 100 120 140 160 Ambient Temperature (°C) Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 01 Aug. 2012 75 Wirewound Resistor with Thermal Cut-offs ■ Dimensions in mm (not to scale) Discontinued 9±1 f0.6±0.1 +2.0 f0.8±0.1 4.5 –1.0 25.5±1.5 13±1 +2 5 –1 ■ Fusing Characteristics ERU5TBK6R8 ERU5TBK5R1 1000 1000 (Thermal Cutoff) Fusing Time (s) Fusing Time (s) (Thermal Cutoff) 100 10 1 100 10 1 (Wirewound) 1 (Wirewound) 3 10 30 100 300 1000 Applied Load (W) 1 3 10 30 100 300 1000 Applied Load (W) ERU5TBJ150 ERU5TBJ100 1000 1000 (Thermal Cutoff) Fusing Time (s) Fusing Time (s) (Thermal Cutoff) 100 10 100 10 1 1 (Wirewound) (Wirewound) 1 1 3 10 30 100 300 1000 Applied Load (W) 3 10 30 100 300 1000 Applied Load (W) ■ Packaging Methods Please contact the factory for packaging methods. Safety Precautions The following are precautions for individual products. Please also refer to the common precautions for Fixed Resistors shown on this catalog. 1. When voltage exceeds the rated voltage and/or a current exceeds the rated current and are continuously applied, the element of Wirewound Resistor with Thermal Cutoffs (hereafter called the resistors) produces excessive heat, which may not only deteriorate the built-in the Thermal Cutoffs but also blow it. 2. The resistors have a built-in the Thermal Cutoffs. Therefore, use and store them within their respective operating and storing temperature ranges as specified in individual delivery specifications. 3. Carefully check the inductance effect of the resistors when using them in a high-frequency circuit. 4. If a transient load (heavy load in a short time) like a pulse is expected to be applied, check and evaluate the operations of the resistors when installed in your products under the most adverse conditions before use. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 01 Aug. 2012 76