Components and technical solutions for power electronics

Heat sinks, thermal pipes

Innovative Solutions Provider for cooling Power Electronics applications

Manufacturing plant

MERSEN (FERRAZ-SHAWMUT) Thermal Management has been located in La Mure (30km south of Grenoble) since 1999 in a 6000m2 plant. The Grenoble area is well known for its electronics industry, development center and skilled workforce.

This plant is the MERSEN Thermal Management center of excellence with it own: R&D, Laboratory, Engineering, Production, Logistics, Sales & Marketing support, and Quality support. The information systems, Quality main system, Global Purchasing, Human resources and finances are supported by the central MERSEN organisation in Lyon, just 100 km away.

Thermal and hydraulic design capability

FS Thermal Management's engineering team will help you find innovative solutions and can also simulate your application

Our unique knowledge in air-, heat pipe- and water-cooling heat sinks as well as cooling unit groups gives FS Thermal Management the possibility to help you find the right solution for the thermal protection of our customers applications. Furthermore, the participation of FS Thermal Management in European thermal research groups and the designing work on several demanding thermal applications all over Europe means we can offer the widest variety of adapted competitive designs. 

Beyond our thermal and hydraulic expertise our engineering team offers our customers global mechanical and system engineering capability. We then work close to our customer to solve their global functional needs.

Testing capability

 Thermal:  measurements of Rth, Zth with air, water, de-ionised water or glycol water  
 Hydraulic:  pressure drop, cycle pressure test, acoustics
 Mechanic:  clamping, hardness, flatness, Ra, Rz
 Electric:   dielectric, conductivity

Agreements with Grenoble research laboratories give even more testing capabilities 

Quality and continuous improvement programs

In order to improve Quality and Service to our customers, FS Thermal Management has the following certification and continuous improvement programs:
• ISO 9001, since 2000
• 5S plant organisation
• KANBAN methods for logistics

Manufacturing capability

Vacuum brazing technology

Vacuum brazing technology allows FS Thermal Management to design high performance hydraulic circuits in order to meet the most demanding thermal, hydraulic and mechanical specifications imposed by our customers.
Vacuum brazing ensures watertightness for decades and enables the heat sink to withstand internal pressure up to 50 bars without deformation.

Swaging technology

The metal displacement process developed and patented by R-Theta in Canada, licensed to FS Thermal Management and referred to as "swaging", creates an interface between the fin and a monolithic base plate, which has no measurable thermal resistance. Because there is no dependence on adhesives in the interface region, the FabFin prin-ciple provides outstanding performance in even the harshest environments. Performance of the patented swaged series of heat sinks is limited only by the amount of cooling air which can be delivered to the heat sink's high fin ratio architecture. 

Machining and prototyping

FS Thermal Management's investment in a high speed machining center, brazing tooling and oven, and a heat pipe filling bench, allows us to provide our customers with manufacturing flexibility, short lead times and prototyping capability. 

Assembly and testing capability

In order to answer increasing demands from our customers, FS Thermal Management is able to offer mechanical assembling of components on our heat sinks (nozzles, mechanical or electrical fittings, semiconductors, busbars, etc ) FS Thermal Management has the possibility to do all requested tests for characterisation as well as for serial production.  


TRANSCAL®: Heat pipe heat sinks

• High thermal performance.
• Homogeneity of temperature under components.
• Instantaneous cooling action.
• Limiting temperature peaks.
• Dielectric insulation possible.
• Starting temperature -40°C.
• Easy maintenance.
• More than 20 years of experience in traction, industrial and military applications.
• For the cooling of press-pack or screwmounted modules

RADIACAL®: Fin forming heat sinks


• Straight or corrugated fins soldered or bonded onto a base plate

• Surpassing classical solutions by combining lightness and thermal performances


High power electronics in the aeronautics, telecommunications and traction fields.

FABFIN®: Air-cooled heat sinks

FABFIN®: Air-cooled heat sinks

Use the free on-line thermal simulation program on our website:


Moducal®: Single component heat sinks

Vacuum brazing of colaminated aluminium grids enclosed between two covrs.
Single or double side cooling. 
• The optimized internal technology offers the highest thermal performance and a low pressure drop. 
• The uniform flow distribution guarantees high reliability of your electronic device. 

Calistor®: Press-pack heat sinks

Vacuum brazing of colaminatedaluminium grids enclosed bet-ween two covers.The grids can be brazed on analuminium profile.

• Same as for the Moducal®  
• The profile is used for the hydraulic fittings, for a tab for electrical connection and as a mounting plate for other components. 

Calitube: Stainless-steel cooling circuit heat sinks


Over-moulding an aluminium block around a stainless-steel tube.

The tube is bent into several turns under the components.

• Over-moulding ensures excellent contact between the two materials. 
• Stainless-steel enables to use all types of cooling fluid.
• Single or double side cooling. 

Multical: Mounting plates and heat sinks

• Vacuum brazing of a cover on machine tooled cooling circuits
• Different cooling circuit geometries available.
• Single or double side cooling.
• All dimensions available.
• Design able to meet highest technical specification.
• Thermal homogeneity over the entire surface available.
• Hydraulic connectors customized to our customer's design.

Syscal: Cooling unit groups

Expertise in dimensioning and manufacture of complete cooling loops.