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Bourns MFRX300722 Resettable Fuse

Bourns MF-RX300/72-2 is a resettable fuse offering circuit protection in low-voltage power supply applications up to 72V. Constructed with a cured, flame retardant epoxy polymer, it meets UL 94 V-0 requirements and is RoHS compliant. These resettable fuses are ideal for security and fire alarm systems, loudspeakers, and power transformers. They offer a convenient and reliable solution for overcurrent protection, automatically resetting after a fault and minimizing downtime.

Authorized Distributors
Source:Newark
Part No:MF-RX300/72-2
Stock:1678
Inv Date:05-28-2026
Price: Unit price: $0.3
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Source:DigiKey
Part No:MF-RX300/72-2
Stock:196
Inv Date:05-28-2026
Price: Unit price: $0.85
Buy/RFQ:
Part No:MF-RX300/72-2
Stock:7553
Inv Date:05-29-2026
Price: Unit price: $0.71
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Part No:MF-RX300/72-2
Stock:0
Inv Date:05-28-2026
Price: Unit price: $0.54
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Part No:MF-RX300/72-2
Stock:10000
Inv Date:05-28-2026
Price: Unit price: $0.3185
Buy/RFQ:
Part No:MF-RX300/72-2
Stock:10000
Inv Date:05-28-2026
Price: Unit price: $0.3185
Buy/RFQ:

Bourns MFRX300722 Resettable Fuse Specifications:

  • V max: 72 Volts
  • I max: 40 Amps
  • Ihold: 3.00 Amperes
  • Itrip: 6.00 Amperes
  • Initial Resistance (Min): 0.04 Ohms
  • Initial Resistance (Max): 0.06 Ohms
  • 1 Hour (R1) Post-Trip Resistance: 0.10 Ohms
  • Max Time to Trip: 15.0 Seconds
  • Tripped Power Dissipation: 2.80 Watts
  • Operating/Storage Temperature: -40 °C to +85 °C
  • Max Device Surface Temperature in Tripped State: 125 °C
  • Passive Aging: +85 °C, 1000 hours ±5 % typical resistance change
  • Humidity Aging: +85 °C, 85 % R.H. 1000 hours ±5 % typical resistance change
  • Thermal Shock: +85 °C to -55 °C, 10 times ±10 % typical resistance change
  • Solvent Resistance: MIL-STD-202, Method 215 No change
  • Vibration: MIL-STD-883C, Method 2007.1 No change

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Frequently Asked Questions

Where can I buy Bourns MFRX300722?

You can click on the BUY or RFQ button to purchase MFRX300722 from an authorized Bourns distributor.

How do I troubleshoot issues or seek technical support for part MFRX300722?

You can download the MFRX300722 datasheet or visit the Bourns website for support.

Who is the manufacturer of MFRX300722?

Bourns

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