ECSR Class RK5 600Vac, 70 to 600A Dual-Element, Time-Delay Fuses Dimensions (inches) Simplifies and improves blackout prevention (selective Catalog Symbol: ECSR coordination ratios). Dual-Element, Time-Delay 10 seconds (minimum) at 500% Dual-element fuses can be applied in circuits subject to rated current temporary motor overloads and surge currents to Current-Limiting provide both high-performance, short-circuit and overload protection. Volts: 600Vac (or less) Amps: 65 to 600A Catalog Numbers (amps) IR: 200kA RMS Sym. ECSR70 ECSR110 ECSR225 ECSR450 Agency Information: CE, UL. Listed, Std. 248-12, Class ECSR75 ECSR125 ECSR250 ECSR500 RK5, Guide JDDZ, File E162363 CSA Certified, HRCI-R ECSR80 ECSR150 ECSR300 ECSR600 C22.2 No. 248.12, Class 1422-01, File 53787 ECSR90 ECSR175 ECSR350 Features ECSR100 ECSR200 ECSR400 Provides motor overload, ground fault and short-circuit Carton Quantity and Weight protection. When used in circuits subject to surge Carton Weight per Carton currents such as those caused by motors, transformers Amps Quantity lbs kg and other inductive components, these fuses can be 65100 1 0.54 0.24 sized close to full-load Amps to give maximum 101200 1 1.22 0.54 overcurrent protection. 201400 1 3.00 1.36 The time-delay feature makes it possible to use fuse 401600 1 5.00 2.27 Amp ratings, which are much smaller than those of non-time-delay fuses. Considerable cost saving occurs Class R Fuse Blocks (600V) Catalog Data by permitting the use of smaller size switches, panels (Clip Retaining Spring Standard, Suffix R) and fuses themselves. Terminal Type (Suffix No.) Basic Box Lug w/ Provides a good degree of short-circuit protection Catalog Reinforced Clip (greater current-limitation) to help protect downstream Amps Poles Number CU only components from high fault currents. 70 1 R60100-1 CR COR Gives motor running back-up protection to motors to 2 R60100-2 CR COR without extra costs. 100 3 R60100-3 CR COR Helps protect motors against burnout from overloads to 200 1 R60200-1 CR and single phasing when sized properly. to 400 1 R60400-1 CR to 600 1 R60600-1 CR Form No. ESCR 70-600 07-10-07 Page 1 of 2 BU-SB07255 Data Sheet 1318ECSR Class RK5 600Vac, 70 to 600A Dual-Element, Time-Delay Fuses Current Limitation Curves Time-Current Characteristic Curves Average Melt Current-Limiting Effects ECSR Apparent RMS Symmetrical Let-Through Current Prosp. SCC 30A 60A 100A 200A 400A 600A 5000 1400 2000 2900 3950 5000 5000 10,000 1850 2650 3600 5100 8550 10,000 15,000 2200 3200 4100 5950 9750 13,700 20,000 2450 3550 4500 6600 10,700 15,000 25,000 2700 3900 4850 7150 11,500 16,100 Fuse Reducers For Class R Fuses 30,000 2900 4280 5150 7650 12,200 17,050 Equipment Desired Fuse Catalog Number 35,000 3100 4400 5400 8100 12,800 17,900 Fuse Clips (Case) Size (Pairs) 600V 40,000 3300 4760 5600 8500 13,400 18,700 200A 100A No. 2621-R 50,000 3550 5150 6050 9250 14,400 20,050 400A 100A No. 2641-R 60,000 3800 5500 6400 9850 15,250 21,250 200A No. 642-R 80,000 4300 6100 7000 10,950 16,750 23,300 100A No. 2661-R 100,000 4500 6600 7550 11,900 18,000 25,000 600A 200A No. 2662-R 150,000 5200 8000 8600 13,800 20,550 28,450 400A No. 2664-R* *Single reducer only (pair not required). 200,000 5800 8500 9400 15,350 22,550 31,200 The only controlled copy of this document is the electronic read-only version maintained by Cooper Bussmann. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, with- out notice, to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. Form No. ESCR 70-600 07-10-07 Page 2 of 2 BU-SB07255 Data Sheet 1318