Skip to main content

All locations

Please select your country & language

China | 中国
Germany | Deutschland

Your country is not in the list?

Go to our international website:

Mersen EP International website
Contact us

Approvals & Standards

  • UL recognized component UL File 60314
  • AC: UL guide no. JFHR2
  • DC Tested to UL standard 198L parameters (70-1200A)
  • CSA Certified LR12636

Key features & benefits

A50QS Amp-Trap® Form 101 fuses grew out of the need to improve the overall performance of semiconductor fuses in response to new equipment requirements. The A50QS encompasses the best protection features – lower I2t to provide better protection for equipment, longer life when subjected to cyclic loading and lower watts loss. A50QS is today’s best choice for the protection of dynamic solid state equipment such as motor drives, inverters, UPS, etc.

More specifications


  • Protection of 500V or less motor drives, UPS, inverters, etc.

Product Specifications

Item Number


Item Description (ERP)

14004-FUSE,FORM 101  


Semiconductor Fuse Amp-Trap® 500V 150A aR High Speed A50QS Type 4Y  

EAN/UPC code


Rated voltage AC UL

500   V

Rated voltage DC UL

500   V

Rated current

150   A


High Speed  



AC Max I.R./Breaking Capacity: I1

59   kA

Contact materials

Tin-Plated Brass  

Connection/Terminal Type


Body/Insulating Material


Product Weight

0.186   kg

Product Diameter

31   mm

Product Length

92.2   mm

Sell Pack Quantity

5   Each

Sell Pack Weight

0.9752   kg

Sell Pack Width

146   mm

Sell Pack Length

203.2   mm

Sell Pack Height

38.1   mm