current transformers type JOF

Our wide range of products insulated with oil-paper or SF6 offers our customers an optimal choice of high-quality instrument transformers with a long lifetime.

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current transformers type JKS-S

This range of products covers standardized resin casted current and voltage transformers in block design up to 72 kV as well as cable current transformers. All products meet the specifications for various indoor and outdoor applications in power stations and power distribution systems.

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current transformers type TSC

Instrument transformers for low voltage applications are produced according national and international standards. The current and voltage transformers can be calibrated for different countries and delivered with the corresponding certificate.

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true values


We believe in Switzerland and Germany as locations that are centres of excellence for development and production, and the manufacturing facilities in Turkey and Brazil for the local markets. We are convinced that sincerity, innovation and performance are the building blocks for lasting success.

We take our responsibility as an employer and industrial enterprise seriously – our success is based on committed staff. We offer good working conditions and expect high levels of motivation from our employees. These features set us apart and form the basis of our partnership relationships with customers and suppliers.

Visualisation of the planned new building in Grenchen

ALPHA-ET - New building project in Grenchen

The ground-breaking ceremony for the new building is imminent and with it the start of the relocation of our company ALPHA Elektrotechnik AG from Nidau to Grenchen.

By clicking on this link you will be directed to the Grencher Tagblatt newspaper article on the project:


PFIFFNER International AG has acquired HAEFELY Test AG

Hirschthal, 02.09.2019 - PFIFFNER International AG, a solution supplier for customers in the sectors of electrical energy and rolling stock, announces today the acquisition of HAEFELY TEST AG. Accordingly, the four traditional Swiss brands - PFIFFNER Instrument Transformers, MOSER GLASER, ALPHA-ET and now HAEFELY - are now aligned under one common roof.

HAEFELY did belong to the HUBBELL Group prior to the transaction. HUBBELL is a US-stock listed company. HAEFELY is located in Basel-city, Switzerland, and develops, produces and sells high-voltage test systems and instrumentation for customers in the electrical energy and general industry sector.

A strong brand, remaining strong

HAEFELY is a well-known brand and has been founded by the pioneer Emil Haefely in 1904. In Basel are working app. 100 employees, further employees in China and India. All employees in Basel will be taken over.

The customers of HAEFELY are electric utilities, industrial manufacturers of products for the electric energy sector and general industrial manufacturers who need to qualify their products in line with international standards concerning Electromagnetic Compatibility or electric insulation level.

HAEFELY will remain active on the market under the HAEFELY brand.

„I’m very pleased to welcome all employees at PFIFFNER International. Both companies share the passion for current and voltage as well as for innovative technology and products for the electric energy sector what will ease the integration of HAEFELY in our Group” says Fritz Hunziker the chairman of the board and the owner of the PFIFFNER Group.

The acquisition is a further milestone to achieve PFIFFNER’s vision of being a leading solution provider for the electric energy sector in terms of quality, innovation, reliability and excellent service.

What we stand for

Many years of experience, comprehensive expertise, international market presence and the desire to continuously develop our products; these aspects make us an efficient and solution-orientated partner.