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0313.400HXP
Part Number 0313.400HXP
Manufacturer Littelfuse Inc.
Description FUSE GLASS 400MA 250VAC 3AB 3AG
Quantity Available 35220 pcs new original in stock.
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Datasheets 0313.400HXP.pdf
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Technical Information of 0313.400HXP
Manufacturer Part Number 0313.400HXP Category Circuit Protection
Manufacturer Hamlin / Littelfuse Description FUSE GLASS 400MA 250VAC 3AB 3AG
Package / Case 3AB, 3AG, 1/4' x 1-1/4' Quantity Available 35220 pcs
Voltage Rating - AC 250 V Size / Dimension 0.250' Dia x 1.250' L (6.35mm x 31.75mm)
Series 313 Response Time Slow Blow
Package / Case 3AB, 3AG, 1/4' x 1-1/4' Package Bulk
Operating Temperature -55°C ~ 125°C Mounting Type Requires Holder
Melting I²t 1.35 Fuse Type Cartridge, Glass
DC Cold Resistance 1.875 Ohms Current Rating (Amps) 400 mA
Color - Breaking Capacity @ Rated Voltage 35A
Approval Agency CE, CSA, UL  
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Frequently Asked Questions

  • How does the 400 mA current rating of the 0313.400HXP fuse influence its selection for circuits with moderate load currents? The 400 mA current rating of the 0313.400HXP fuse allows it to handle continuous loads up to that value while providing a safety margin, making it appropriate for powering small indicators or sensors in control panels where steady-state currents are below 400 mA.
  • In what way does the slow-blow response time of the 0313.400HXP fuse affect timing coordination in a protection scheme? The slow-blow response time of the 0313.400HXP fuse enables it to tolerate temporary overcurrents, such as those from capacitive inrush, before interrupting, which is critical for coordinating with other components that may have faster response times.
  • Why is the 0313.400HXP fuse supplied in bulk packaging requiring holders for 3AB and 3AG sizes? The 0313.400HXP fuse is provided in bulk because it is a through-hole component that needs individual mounting in holders to ensure proper alignment and contact in the 0.250 inch diameter by 1.250 inch length package.
  • What engineering considerations arise from the -55°C to 125°C operating temperature range of the 0313.400HXP fuse in varying ambient conditions? The -55°C to 125°C operating temperature range of the 0313.400HXP fuse supports use in both refrigerated storage areas and hot industrial environments, but ensure that self-heating from the 1.875 Ohms resistance does not push junction temperatures beyond limits.
  • How does the 35A breaking capacity at 250 V of the 0313.400HXP fuse determine its role in fault interruption scenarios? The 35A breaking capacity at 250 V of the 0313.400HXP fuse indicates it can safely clear faults up to that level without exploding or failing open, suitable for circuits where prospective fault currents stay below this threshold to avoid arc flash hazards.
  • What design implications follow from the 1.35 melting I²t of the 0313.400HXP fuse when calculating time to blow under fault conditions? The 1.35 melting I²t value for the 0313.400HXP fuse helps estimate the duration needed for current to reach melting point during overcurrents, allowing precise setting of circuit breakers or fuses upstream for selective coordination.
  • How should the 1.875 Ohms DC cold resistance of the 0313.400HXP fuse be incorporated into efficiency and heat calculations? The 1.875 Ohms DC cold resistance of the 0313.400HXP fuse results in minimal power dissipation for 400 mA applications, calculated as approximately 0.3 W, which is negligible but should be subtracted from supply voltage in precision designs.
  • Which circuit types benefit most from the glass cartridge construction of the 0313.400HXP fuse? The glass cartridge construction of the 0313.400HXP fuse provides clear visual indication of blown status and is ideal for visible wiring in small devices or where users need to inspect the fuse condition without disassembly.
  • What application suitability limitations exist for the 0313.400HXP fuse in high-reliability systems? Although the 0313.400HXP fuse meets UL, CSA, and CE approvals, its slow-blow nature and 400 mA rating limit use in high-speed switching or high-current applications, where faster or higher-rated fuses would be more appropriate.
  • How does the 0313.400HXP fuse compare in performance to the 0313.400MXP variant from the same manufacturer? The 0313.400HXP and 0313.400MXP share the same 400 mA, 250 V, slow-blow characteristics and physical size, but the HXP variant may have different lead styles or packaging that affect solderability or vibration resistance in specific assemblies.
  • What considerations guide the choice between the 0313.400HXP fuse and the BK/MDL-4/10 when both offer similar current ratings? While the BK/MDL-4/10 provides a fast-blow response compared to the slow-blow of the 0313.400HXP fuse, the latter is preferred in circuits with inductive loads to prevent nuisance tripping from inrush currents, though it offers less protection against sudden spikes.
  • In replacement scenarios, how does selecting the 0313.400HXP fuse affect long-term reliability versus legacy glass fuses? Selecting the 0313.400HXP fuse as a direct replacement for older glass fuses maintains the same 400 mA slow-blow profile but benefits from modern manufacturing consistency and RoHS compliance, potentially improving overall system reliability by reducing variability in performance over time.
  • What impact does the 35A breaking capacity of the 0313.400HXP fuse have on arc flash mitigation in enclosed equipment? The 35A breaking capacity of the 0313.400HXP fuse helps contain arc energy during interruption, making it suitable for use in enclosed panels where fault currents are controlled, thereby reducing the risk of arc flash injuries compared to unprotected wiring.
  • How does the operating temperature range of the 0313.400HXP fuse influence its placement relative to heat-generating components in a PCB layout? Positioning the 0313.400HXP fuse away from high-power resistors or regulators is advisable because its -55°C to 125°C range allows it to function but close proximity could cause premature aging or false tripping due to elevated ambient temperatures.
  • Is the 0313.400HXP fuse appropriate for use in communication systems requiring low voltage drop? The low 1.875 Ohms DC cold resistance of the 0313.400HXP fuse results in minimal voltage drop at 400 mA, making it suitable for signal circuits in communication equipment where even small power losses could affect bit error rates or efficiency.
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