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
Country / Language: 
Contact us

Approvals & Standards

IEC 60282-1

  • VDE 0670 part 4
  • VDE 0670 part 402
  • DIN 43625

Key features & benefits

Mersen HV fuse-links have been used for reliable protection in high-voltage switchgear and controlgear and high-voltage systems for decades.
For the Limitor®-PTS range, Mersen innovates with new fuse-element designs to reduce power losses and new thermal striker to prevent overheating in the fuse compartment of the switch gear.
Mersen uses the best materials : fuse-elements are in pure silver, caps are in copper coated with silver and body is in ceramic.
Limitor®-PTS HV fuse-links are dedicated to protect transformers in combination with air or gas insulated switchgear against the thermal and dynamic effects of short-circuits.
Siemens and Ormazabal recommend Limitor®-PTS HV fuses to be used in their gas-insulated switchgear.

More specifications


Best used in SF6 insulated switch gear and compact switch gear

  • HV Transformer protection

Product Specifications

Item Number


Catalogue No.


Item Description (ERP)

H 1209P BCKUP TS VDE442-78/125  

Short Description

HV fuse DIN 43625, 12kV, 125A, 442mm, 45mm, thermal striker  



Rated voltage AC IEC

12   kV

Ampere Rating

125   A

Fuse Size

d=78mm, L=442mm  



Clearing I2t At Rated Voltage

300   kA²s

AC Max I.R./Breaking Capacity: I1

80   kA

Min Interrupting Rating (MBC)

440   A

Power Dissipation at Rated Current Value

105   W

Indication System


Indication System Type


Connection/Terminal Material

Silver-Plated Copper  

Connection/Terminal Type


Body/Insulating Material


Product Weight

11.244   lb

Product Diameter

3.07   in

Product Length

20   in

Sell Pack Quantity

1   EACH

Sell Pack Weight

11.244   lb

Sell Pack Width

3.74   in

Sell Pack Length

21.65   in

Sell Pack Height

3.94   in