Fuse Datasheet 304 Series PICO 277V Intrinsically Safe Fuse RoHS Description The PICO 304 Series offers a range of suface mountable encapsulated fuses certified as intrinsically safe components that can be used in hazardous locations. Ideal for use in oil, gas, mine, chemical, pharmaceutical and process industries, the PICO 304 Series surface mountable fuse was designed to limit the energy and temperature generated during its operation. The fuse design and its encapsulant are suitable for use in intrinsically safe apparatus and associated apparatus for peak voltage not exceeding 375V. Features Surface Mount able Global hazardous location certifications Encapsulated and sealed (1mm minimum) Suit able for Class I, Class II, Class III, and Zone 0 Hazardous High breaking capacity of Location. 1500A at 277V AC/DC Agency Approvals RoHS-compliant Current rating options from 0.050 to 0.750A Agency Agency File Number Ampere Rating DEMKO 13 ATEX 1200U 50 - 750mA Applications II 1 G Ex ia IIC Testing, measuring or Process control and automation E358130 50 - 750mA processing electronic and Sensors IECEx UL 13.0077U Ex ia IIC 50 - 750mA electrical equipment Lighting NA 50 - 750mA Motor controllers Flo w/gas meters Communication handsets/t wo- way radios Reference Standards Electrical Characteristics for Series Agency Standards % of Ampere Rating Opening Time ATEX EN 60079-0, EN 60079-11, EN 60079-26 IECEx IEC 60079-0, IEC 60079-11, IEC 60079-26 110% 4 Hours, Minimum UL 913, UL 60079-0, UL 60079-11, 300% 10 Seconds, Maximum United States UL 248-1, UL 248-14 CAN/CSA C22.2 No. 157, CAN/CSA C22.2 Canada No. 60079-0,CAN/CSA C22.2 No. 60079-11, CSA 248-1, CSA 248-14 Electrical Specifications by Items Agency Approvals Ampere Nominal Minimum Cold Minimum Cold Nominal Cold Catalog Amp Interrupting Rating Melting Resistance at Resistance at Resistance at Number Code Rating 2 2 (A) I t (A Sec.) -20C (Ohms) -40C (Ohms) 25C (Ohms) 0304.050 0.050 .050 0.00019 9.202 9.010 12.00 X X X X 0304.080 0.080 .080 0.00035 6.031 5.963 8.19 X X X X 0304.100 0.100 .100 0.00070 2.709 2.668 5.00 X X X X 0304.160 0.160 .160 0.00202 2.297 2.292 3.00 X X X X 1500A 277VAC/DC 0304.200 0.200 .200 0.00288 1.935 1.839 2.68 X X X X 0304.250 0.250 .250 0.00662 1.268 1.105 1.60 X X X X 0304.500 0.500 .500 0.04462 0.392 0.368 0.46 X X X X 0304.750 0.750 .750 0.13448 0.219 0.196 0.27 X X X X Notes: 1. The fuse must be mounted so that creepage and clearance distances are not impaired in any way. 2. The fuse is suitable for use in intrinsically safe equipment and associated apparatus for voltage not exceeding 375V peak. 3. Maximum surface temperature rise at 170% rated current: 200mA = 88C, 250mA = 52C, 500mA = 52C, and 750mA = 45C. 2021 Littelfuse, Inc. 1 Specifications are subject to change without notice. Revised: GD. 10/14/21Fuse Datasheet 304 Series PICO 277V Intrinsically Safe Fuse Product Characteristics Temperature Rerating Curve Operating Temperature 140 Current Rating Ambient Temperature 0.200A -40C to +60C 120 0.250A -40C to +56C 0.500A -40C to +84C 100 0.750A -40C to +56C Notes: 80 1. Any use of the 304 Series fuse outside of the ambient temperature ranges specified in the table is subject to additional investigation. 60 2. Specified ambient temperature range is for intrinsic safety certification. 25C 40 Polyamide 6T/66 CTI 175 volts minimum Molding Material 20 Continuous Operating Temperature: 140C -60 -40 -20 020406080100 120 Thermal Shock Withstands 5 cycles of 55C to 125C AMBIENT TEMPERATURE (C) Mechanical Shock MIL-STD-202, Method 213 Notes: Insulation Resistance (After Greater than 10,000 ohms 1. Rerating depicted in this curve is in addition to the standard rerating of 25% for continuous operation. Opening) (at twice rated DC voltage) 2. The temperature rerating curve represents the nominal conditions. For questions about temperature rerating curve, please consult Littelfuse technical support for assistance. Resistance to Soldering Heat MIL-STD-202, Method 210 Moisture Resistance MIL-STD-202, Method 106 Salt Fog Test MIL-STD-202, Method 101 Soldering Parameters Reflow Condition Pb-free assembly - Temperature Min (Ts(min)) 150C t P T P Critical Zone Pre Heat - Temperature Max (Ts(max)) 200C Ramp-up T L to T P - Time (Min to Max) (ts) 60 120 seconds T L t L Average Ramp-up Rate (Liquidus Temp (TL) to 5C/second max T S(max) peak) TS(max) to TL - Ramp-up Rate Ramp-down 5C/second max Preheat - Temperature (TL) (Liquidus) 217C T S(min) Reflow t S - Temperature (tL) 60 150 seconds +0/-5 P Peak Temperature (T ) 260 C 25 time to peak temperatur e Time within 5C of actual peak Temperature (tp) 20 40 seconds Time (t 25C to peak) Ramp-down Rate 5C/second max Time 25C to Peak Temperature (TP) 8 minutes max Do not exceed 260C Wave Soldering 260C, 10 sec. max 2021 Littelfuse, Inc. 2 Specifications are subject to change without notice. Revised: GD. 10/14/21 PERCENT OF RATING Tem p eratu re