305 Series - 277V UL913 Intrinsically Safe Fuse for Hazardous Locations

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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® 305 Series offers a range of encapsulated fuses approved under the UL913 standard for Intrinsically Safe Electrical Equipment to operate in hazardous locations. It is ideal for use in the oil, gas, mining, chemical, pharmaceutical, food/beverage processing industries; it was designed to limit the energy and heat generated during its operation. In addition to UL913, these fuses meet ATEX and IECEx requirements.


  • Sealed, encapsulated design
  • Well suited for 277V applications
  • Current rating options from 50mA to 750mA
  • Designed for operation in a range of hazardous environments
  • High Interrupting Rating. Meets the 1500A minimum


  • The fuse encapsulation prevents heat and sparks from being exposed to hazardous dusts and gases in the environment
  • Eliminates the need for additional potting, epoxy, or encapsulation processes for the fuse, thereby reducing total product cost
  • Increases overall safety of the apparatus, which enhances protection of human life in hazardous operating environments


  • Testing, measuring or processing electronic and electrical equipment
  • Motor controllers
  • Lighting
  • Communication handsets
  • Flow meters
  • Process control and automation equipment
  • Sensors 

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VAC (V)VDC (V)Nominal Melting I2T (A2sec)Resistance
Max Operating Temp (°C)Min Operating Temp (°C)OpeningSizeStockSamplesCompare
305.0500.052772770.0001911.88125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.0800.082772770.000358.15125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.1000.12772770.00075125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.1600.162772770.002022.95125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.2000.22772770.002882.64125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.2500.252772770.0041.59125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.5000.52772770.06720.47125-55Fast-Acting (F)9 x 15.6mmCheckOrder
305.7500.752772770.134480.288125-55Fast-Acting (F)9 x 15.6mmCheckOrder