ECSR Class RK5 600Vac, 70 to 600A Dual-Element, Time-Delay Fuses Dimensions (inches) Catalog Symbol: ECSR Dual-Element, Time-Delay – 10 seconds (minimum) at 500% rated current Current-Limiting Volts: 600Vac (or less) Amps: 65 to 600A IR: 200kA RMS Sym. Agency Information: CE, UL. Listed, Std. 248-12, Class RK5, Guide JDDZ, File E162363 CSA Certified, HRCI-R C22.2 No. 248.12, Class 1422-01, File 53787 Features • Provides motor overload, ground fault and short-circuit protection. When used in circuits subject to surge currents such as those caused by motors, transformers and other inductive components, these fuses can be sized close to full-load Amps to give maximum overcurrent protection. • The time-delay feature makes it possible to use fuse Amp ratings, which are much smaller than those of non-time-delay fuses. Considerable cost saving occurs by permitting the use of smaller size switches, panels and fuses themselves. • Provides a good degree of short-circuit protection (greater current-limitation) to help protect downstream components from high fault currents. • Gives motor running back-up protection to motors without extra costs. • Helps protect motors against burnout from overloads and single phasing when sized properly. 07-10-07 BU-SB07255 • Simplifies and improves blackout prevention (selective coordination ratios). • Dual-element fuses can be applied in circuits subject to temporary motor overloads and surge currents to provide both high-performance, short-circuit and overload protection. Catalog Numbers (amps) ECSR70 ECSR110 ECSR75 ECSR125 ECSR80 ECSR150 ECSR90 ECSR175 ECSR100 ECSR200 ECSR225 ECSR250 ECSR300 ECSR350 ECSR400 ECSR450 ECSR500 ECSR600 Carton Quantity and Weight Carton Weight per Carton Amps Quantity lbs kg 65–100 1 0.54 0.24 101–200 1 1.22 0.54 201–400 1 3.00 1.36 401–600 1 5.00 2.27 Class R Fuse Blocks (600V) Catalog Data (Clip Retaining Spring Standard, Suffix “R”) Amps 70 to 100 to 200 to 400 to 600 Poles 1 2 3 1 1 1 Terminal Type (Suffix No.) Basic Box Lug w/ Catalog — Reinforced Clip Number CU only R60100-1 CR COR R60100-2 CR COR R60100-3 CR COR R60200-1 CR — R60400-1 CR — R60600-1 CR — Form No. ESCR 70-600 Page 1 of 2 Data Sheet #1318 ECSR 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 30,000 2900 4280 5150 7650 12,200 17,050 35,000 3100 4400 5400 8100 12,800 17,900 40,000 3300 4760 5600 8500 13,400 18,700 50,000 3550 5150 6050 9250 14,400 20,050 60,000 3800 5500 6400 9850 15,250 21,250 80,000 4300 6100 7000 10,950 16,750 23,300 100,000 4500 6600 7550 11,900 18,000 25,000 150,000 5200 8000 8600 13,800 20,550 28,450 200,000 5800 8500 9400 15,350 22,550 31,200 Fuse Reducers For Class R Fuses Equipment Desired Fuse Catalog Number Fuse Clips (Case) Size (Pairs) 600V 200A 100A No. 2621-R 400A 100A No. 2641-R 200A No. 642-R 100A No. 2661-R 600A 200A No. 2662-R 400A No. 2664-R* *Single reducer only (pair not required). 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, without 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. 07-10-07 BU-SB07255 Form No. ESCR 70-600 Page 2 of 2 Data Sheet #1318