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Five cylindrical glass tube fuses with metal end caps

Eaton Bussmann

Eaton Bussmann GMC-500-R Glass Fuse 500mA 250V AC Time-Delay 20mm x 5mm Pack of 5

SKU CH-NH9R-ZH4G2

Pack of five 20 mm glass time-delay fuses rated 500 mA at 250 V AC with 10 kA interrupt at 125 V AC

  • Time-delay characteristic prevents nuisance trips on motor start-ups
  • 500 mA rating protects low-current circuits at 250 V AC
  • 10 kA interrupt rating at 125 V AC handles high fault currents
  • 20 mm × 5 mm cylindrical glass body fits standard fuse holders
  • Pack of five fuses provides ready replacements for maintenance

What this fuse protects

This Eaton Bussmann GMC-500-R is a 500 mA glass cartridge fuse rated for 250 V AC. The time-delay characteristic lets it ride through brief inrush currents without opening. It suits low-power equipment such as control boards, instrumentation or lighting ballasts where nuisance trips must be avoided.

Interrupt ratings set the practical limit

At 125 V AC the fuse can safely break 10 kA of prospective fault current. At the full 250 V AC rating the interrupt capacity falls to 35 A. If the circuit can deliver more fault current than these figures the fuse cannot be relied on to clear the fault safely.

Physical size decides fit

The cylindrical body measures 20 mm long by 5 mm diameter. It fits holders and fuse blocks made for the GMC or 239 series such as the HTB block range. A different length or diameter will not make contact in those clips.

How it compares

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Price $12.99
Cheaper than about 90% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How do I decide between the GMC-500-R and other fuses in the GMC series?

The GMC-500-R is rated at 500 mA and 250 V AC with a time-delay characteristic. Choose it when your circuit requires exactly that current and voltage rating; other GMC series fuses carry different ampere values.

What does the 10 kA interrupt rating at 125 V AC mean once the fuse is installed?

It means the fuse can safely break a fault current of up to 10 kA at 125 V AC without rupturing. At 250 V AC the interrupt capacity is 35 A.

What standards apply to the GMC-500-R and what do they cap in practice?

The fuse meets UL 248-14 Guide JDYX, CSA Class 1422-01 and CE. These standards certify the 500 mA / 250 V AC rating, time-delay action, and the 10 kA at 125 V AC and 35 A at 250 V AC interrupt ratings.

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