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Cylindrical melamine fuse with metal end caps

Mersen

Mersen ATQR 3-1/2A Class CC Fuse

SKU CH-VF9A-FBEY6

A 3-1/2 amp Class CC time-delay fuse rated for 600V AC and 300V DC with 200kA and 100kA interrupt ratings

  • Time-delay operation protects circuits from inrush surges
  • 600 V AC rating handles high-voltage industrial supplies
  • 200 kA interrupt capacity clears severe faults safely
  • 100 kA DC interrupt rating suits 300 V DC systems
  • Rejection-style Class CC body prevents incorrect fuse installation

Purpose and fit

This Mersen ATQR Class CC fuse is rated at 3-1/2 amperes for 600 volts AC and 300 volts DC circuits. It suits control panels, motor circuits and general industrial equipment that require a rejection-type fuse with time-delay characteristics. The cylindrical 1-1/2 by 13/32 inch body fits standard Class CC fuse blocks such as the USCC and USFMCC series. Buyers who need a higher amperage rating or a different voltage class should select another device.

Thermals noise and power

The dual-element melamine body provides time-delay operation to tolerate harmless inrush currents without nuisance opening. Under normal load the fuse runs cool and silent, adding no audible noise to the enclosure. Its 100 kiloampere interrupt rating at 300 volts DC and 200 kiloampere rating at 600 volts AC ensure safe interruption of heavy fault currents without damage to surrounding components. The non-indicating design means visual status checks require a separate test.

Deciding specification

The critical value is the 3-1/2 ampere current rating combined with the Class CC rejection feature, which prevents insertion of fuses with lower interrupt ratings. This exact rating must match the circuit design and the fuse block keying; using a different amperage or a non-rejection fuse will compromise coordination and safety. Verify the 600 volt AC and 300 volt DC limits against your system voltage before installation.

Highlights

  • Time-delay operation protects circuits from inrush surges
  • 600 V AC rating handles high-voltage industrial supplies
  • 200 kA interrupt capacity clears severe faults safely
  • 100 kA DC interrupt rating suits 300 V DC systems
  • Rejection-style Class CC body prevents incorrect fuse installation

Specifications

BrandMERSEN/FERRAZ SHAWMUT

Questions about this item

How is the ATQR 3-1/2A fuse installed, and what step is often missed?

Insert the cylindrical body into a compatible USCC or USFMCC fuse block; the rejection feature prevents wrong-class fuses, so verify the block accepts Class CC before fitting.

What maintenance or replacement will this fuse need later?

As a non-indicating, dual-element fuse it gives no visual alert; after any overcurrent event that trips the 100kA DC or 200kA AC interrupt rating, replace the fuse even if the filament appears intact.

What limit appears first under sustained load on this 3-1/2A fuse?

The 3-1/2 ampere rating is the continuous current limit; exceeding it activates the time-delay element, so the thermal threshold is reached before the 600V AC or 300V DC voltage ratings become a factor.

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