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MERSEN FERRAZ A4J Series Fast-Acting Fuses, Class J


Mersen Ferraz A4J Series fast-acting fuses are used in electrical systems, capacitors, load centres, panelboards and circuit breakers for protecting lighting, heating and general loads. They safeguard equipment from overcurrent conditions and ensuring operational safety.

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MERSEN FERRAZ A4J200EIA
MERSEN FERRAZ A4J1B
StyleModelAmpsBody MaterialCurrent RatingDiameterLengthSpeedPrice (ex. VAT)
A
A4J200EI		-GMG200A1.62"5.75"Fast Acting-
RFQ
A
A4J600EI		-GMG600A2.5"8"Fast Acting-
RFQ
A
A4J110EI		-GMG110A1.62"5.75"Fast Acting-
RFQ
B
A4J1		1APolyTube1A0.81"2.25"Fast Acting€15.25
B
A4J3		3APolyTube3A0.81"2.25"Fast-Acting€18.82
B
A4J6		6APolyTube6A0.81"2.25"Fast Acting€18.82
B
A4J10		10APolyTube10A0.81"2.25"Fast-Acting€18.82
B
A4J15		15APolyTube15A0.81"2.25"Fast-Acting€17.84
B
A4J20		20A-----€17.84
B
A4J25		25APolyTube25A0.81"2.25"Fast Acting€17.84
B
A4J30		30APolyTube30A0.81"2.25"Fast-Acting€17.84
B
A4J35		35APolyTube35A1.06"2.38"Fast-Acting€30.02
B
A4J40		40APolyTube40A1.06"2.38"Fast Acting-
RFQ
B
A4J45		45APolyTube45A1.06"2.38"Fast Acting€30.02
B
A4J50		50APolyTube50A1.06"2.38"Fast-Acting€30.02
B
A4J60		60APolyTube60A1.06"2.38"Fast Acting€30.02
B
A4J70		70AGMG70A1.06"4.63"Fast Acting€37.79
B
A4J75		75AGMG75A1.06"4.63"Fast Acting-
RFQ
B
A4J80		80AGMG80A1.06"4.63"Fast Acting€45.28
B
A4J90		90AGMG90A1.06"4.63"Fast Acting€45.28
B
A4J100		100AGMG100A1.06"4.63"Fast-Acting€45.28
B
A4J110		110AGMG110A1.62"5.75"Fast Acting€91.76
B
A4J125		125AGMG125A1.62"5.75"Fast Acting€78.25
B
A4J150		150AGMG150A1.62"5.75"Fast-Acting€78.25
B
A4J175		175AGMG175A1.62"5.75"Fast Acting€78.25
B
A4J200		200AGMG200A1.62"5.75"Fast Acting€78.25
B
A4J225		225AGMG225A2.12"7.13"Fast Acting€173.17
B
A4J250		250AGMG250A2.12"7.13"Fast Acting€173.17
B
A4J300		300AGMG300A2.12"7.13"Fast-Acting€173.17
B
A4J350		350AGMG350A2.12"7.13"Fast-Acting€186.89
B
A4J400		400AGMG400A2.12"7.13"Fast Acting€171.14
B
A4J450		450AGMG450A2.5"8"Fast Acting€234.35
B
A4J500		500AGMG500A2.5"8"Fast-Acting€224.06
B
A4J600		600AGMG600A2.5"8"Fast Acting€201.38

Working Mechanism

  • Overcurrent flows due to a fault or overload.
  • The fuse's internal conductor quickly melts at a specific current threshold.
  • Melting creates an air gap, interrupting the circuit.
  • This protects connected equipment from damage.

Features

  • These fuses offer high current limitation with low peak let-thru current, enhancing safety during overcurrent events.
  • They have unique dimensions to prevent replacement by other fuse classes, ensuring proper protection.
  • These fast acting fuses feature a fibreglass body for enhanced dimensional stability in harsh industrial environments for consistent performance.
  • They come with an easy-to-read imprint label for quick recognition and replacement for simplified maintenance and reduced downtime.

Compatible Accessories

  • Mersen Ferraz Class J Fuseholders: These fuse holders are ideal for holding and connecting Class J fuses within electrical systems.They have GFPC / phenolic construction for structural rigidity and improved insulation in case of electrical emergencies.

Frequently Asked Questions

What factors should I consider while choosing a fast-acting fuse?

  • Match current rating to circuit's needs.
  • Ensure voltage rating is sufficient.
  • Select a fast-acting fuse for quick response.
  • Assess application-specific requirements.
  • Check suitability for the operating environment.
  • Verify short-circuit protection capability.
  • Ensure physical size fits the circuit.
  • Look for relevant safety certifications.
  • Balance cost with performance.
  • Consider ease of replacement.

How do I clean and maintain Mersen Ferraz A4J Series fast-acting fuses?

  • Isolate power supply.
  • Inspect for damage or wear.
  • Replace if necessary.
  • Keep contacts clean.
  • Ensure secure mounting.

How do I install fast-acting fuses?

  • Ensure power is off.
  • Choose the correct fuse size.
  • Insert the fuse into the compatible holder.
  • Ensure proper seating.
  • Restore power cautiously.
  • Verify functionality.

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