0304.500 - PICO® 304 Series

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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The PICO® 304 series offers a range of surface mountable encapsulated fuses certified under UL 913, the standard for intrinsically safe electrical equipment, to operate in hazardous locations. This fuse is ideal for use in oil, gas, mining, chemical, pharmaceutical, food and beverage, and other 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 equipment and associated apparatus for peak voltage not exceeding 375V. In addition to UL 913, these fuses meet ATEX and IECEx requirements.


  • Surface mount device
  • Encapsulated and sealed (1mm minimum)
  • High breaking capacity of 1500A at 277V AC/DC
  • Current rating options ranging from 0.050A to 0.750A
  • Global hazardous locations certifications


  • Suitable for pick-and-place PCB assembly
  • Eliminates the need for encapsulation (potting) or coating, which saves assembly time and money, reducing total end-product cost
  • Ideal for interfaces between intrinsically safe and non-intrinsically safe circuits
  • Enables reduction of power ratings and current-carrying capacity of downstream components, wiring, and circuit board traces
  • Speeds up the certification process for end-products


  • Testing, measuring or processing electronic and electrical equipment
  • Motor controllers
  • Communication handsets/two-way radio and associated accessories
  • Process control and automation
  • Sensors
  • Lighting
  • Flow/gas meters
Property (Mouseover for details) Value
Nominal Melting I2T (A2sec) 0.004462
Moisture Sensitivity Level Level 1
Nominal Cold Resistance (Ohms) 0.46
Opening Fast-Acting (F)
VAC (V) 277
VDC (V) 277
Partner ECAD Models 0304.500
Operating Temperature -40° to 125°C
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
0304.500HR FUSE SMD 277V FOR HAZ LOC UL913 0.500A RoHS No 08/10/2015 PbFree No CoC_RoHS9_0304.500HR REACH205_Declaration_Contain-_0304.500HR Yes
Contains IPC_0304.500HR_ZR
0304.500ZR FUSE SMD 277V FOR HAZ LOC UL913 0.500A RoHS No 08/10/2015 PbFree No Yes
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