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Approvals & Standards

  • IEC 60269-4 Compliance
  • UL/CSA Recognized E76491
  • CCC GB 13539.4 for Asian market only

Key features & benefits

These 1250/1300V Protistor® fuse-links provide maximum flexibility in equipment design and ultimate protection for today's power conversion equipment. These aR ultra-fast acting square body fuse-links are available in different body sizes, each size having multiple worldwide acceptable mounting styles.
The Protistor® have been engineered to provide state-of-the-art protection for semiconductors: diodes, thyristors and IGBT devices. Fuses are assembled with die-cut elements embedded in solidified sand, which helps control arcing characteristics for a lower I²t and high interrupting rating level. All contact surfaces are silver plated and all hardware is non-magnetic.
All fuse-links can be equipped with a low voltage trip-indicator which can operate a field mountable microswitch.

More specifications


  • Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.

Product Specifications

Item Number


Catalogue No.



Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 350A With Striker DIN 110 Blades  



Rated voltage AC UL

1300   V

Rated voltage AC IEC

1250   V

Ampere Rating

350   A

AC or DC




Fuse Size




Clearing I2t At Rated Voltage

140   kA²s

Melting I2t

17   kA²s

AC Max I.R./Breaking Capacity: I1

126   kA

Power Dissipation at Rated Current Value

86   W

Indication System


Indication System Type


Connection/Terminal Material

Silver-Plated Copper  

Connection/Terminal Type

DIN Type Blades  

Body/Insulating Material


Product Weight

2.469   lb

Product Width

2.87   in

Product Length

5.25   in

Product Height

3.09   in

Sell Pack Quantity

3   EA

Sell Pack Weight

7.408   lb

Sell Pack Width

5.91   in

Sell Pack Length

9.84   in

Sell Pack Height

3.54   in