Logo Made in Germany Middle East Electricity 2017


Booth number: Z2.K11

About us

The company EMB GmbH provides more than 50 years experience in producing Buchholz relays, monitoring relays and other protection devices for liquidcooled and liquid insulated appliances. It ranks among the most distinguished manufacturers of this type equipment. Our staff of highly-qualified engineers and experienced skilled workers help ensure we produce top-quality, high-precision equipment. The casings are machined on modern CNC-controlled machine tools. All products are subjected to a final inspection, when all functions are checked using special test equipment. Profound experience and expertise are a sound basis for high product quality. Extensive references from reputed tap changers and transformer manufacturers as well as other users are proof of the high qualitative level of the products. The company is certified to DIN EN ISO 9001/2008 and approved for AEO F.

Products and services

  • Transformer protection relay (Buchholz principle) - Buchholz relay 
  • EMB SMART Buchholz relay with sensors for gas accumulation & temperature monitoring
  • Air cell failure relais
  • Monitoring relay for tap changers 
  • Additional devices for Buchholz relays 
  • Breathing buffer boxes for transformers 
  • Further transformer accessories
Buchholz relay - NM series

Buchholz relay - NM series

Buchholz relays of the NM series allow continuous and analogue gas volume measurement so that accumulated gases in the relay are detected early on, information can be gathered about the generation of the gases, and it is easier to analyze the fault at an early stage. The cap of the terminal box accommodates the electronic amplifier of the measuring unit.

News & Innovations

EMB SMART Buchholz Relay 
  • Capacitive sensor (NM-series) for monitoring of gas accumulation
  • 5 independent contacts
  • 2-level gas alarm
  • Temperature sensor for monitoring of insulating liquids temperature inside the Buchholz relay
  • Possibility for gas sampling and testing on site with new version of EMB Buchholz gas tester BGT 4.0


Otto-von-Guericke-Allee 12
39179 Barleben

Phone: +49 39203 790

Karin Machura
sales director
Phone: +49 39203 790

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