The new 477 Series of 5x20mm ceramic-body, time-lag cartridge fuses are designed for a wide range of industrial and consumer product applications.
These fuses will be of particular interest to OEMs because of their suitability for both primary and secondary protection, which simplifies sourcing and inventory management.
They are available in ampere ratings from 0.5A to 16A, with an interrupting capability of up to 1500A at 400VDC. The compact 5x20 package of the 477 Series, available in cartridge and axial lead configurations, also provides greater design and installation flexibility.
In comparison, for ampere ratings of 8A and above, the nearest competitor to the 477 Series has an AC voltage rating that is 20 percent lower, and yet a cartridge length that is 60 percent longer.
The 477 Series fuses are RoHS-compliant/lead-free, and are recognized under the component programs of the UL, CSA, and SEMKO agencies. They were designed for protection of equipment such as 3-phase power supplies, uninterruptable power systems (UPS), motor control circuits, air conditioning units, and other high-energy applications.
Electronic designers will appreciate the ability to use these fuses in power supply circuits both before and after the PFC (power factor correction) capacitor banks. The 477 Series DC rating also makes them ideal for individual component and secondary circuit protection. Their high interrupting capacity ensures that these fuses will open safely to protect the equipment under very high-current DC short-circuit conditions.
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