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Bourns MFRX300 PTC Resettable Fuse

Bourns MF-RX300 is a resettable fuse offering circuit protection in applications such as security and fire alarm systems, loudspeakers, and power transformers. This fuse is designed to automatically reset after a fault condition, preventing system downtime. It features radial leads, a cured flame retardant epoxy polymer insulating material meeting UL 94V-0 requirements, and is RoHS compliant. While currently available, Bourns recommends the higher voltage rated MF-RX/72 Series for new designs.

Authorized Distributors
Part No:MF-RX300
Stock:0
Inv Date:05-29-2026
Price: N/A
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Part No:MF-RX300
Stock:0
Inv Date:05-28-2026
Price: Unit price: $0.48
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Part No:MF-RX300
Stock:267
Inv Date:05-28-2026
Price: Unit price: $0.7632
Buy/RFQ:
Part No:MF-RX300
Stock:267
Inv Date:05-28-2026
Price: Unit price: $0.7632
Buy/RFQ:

Bourns MFRX300 PTC Resettable Fuse Specifications:

  • Voltage Max: 60V
  • Current Max: 40A
  • Hold Current: 3.00 Amps
  • Trip Current: 6.00 Amps
  • Initial Resistance: 0.10 Ohms
  • Post Trip Resistance: 0.38 Ohms
  • Max Time to Trip: 15.0 Seconds
  • Tripped Power Dissipation: 2.80 Watts
  • Operating Temperature Range: -40°C to +85°C
  • Flammability Rating: UL 94V-0
  • Lead Diameter: 0.81 mm
  • Material: Sn/Cu

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Frequently Asked Questions

Where can I buy Bourns MFRX300?

You can click on the BUY or RFQ button to purchase MFRX300 from an authorized Bourns distributor.

How do I troubleshoot issues or seek technical support for part MFRX300?

You can download the MFRX300 datasheet or visit the Bourns website for support.

Who is the manufacturer of MFRX300?

Bourns

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