Logo Made in Germany ELECRAMA 2018


Booth number: Hall 3A - H3GR7

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

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
  • Buchholz relay NM series 
  • Monitoring relay for tap changers
  • Air cell failure relais
  • Additional devices for Buchholz relays
  • Breathing buffer boxes for transformers
  • Further transformer accessories
SMART Buchhoz relay

SMART Buchhoz relay

Buchholz relay with extended functions by means of sensors:

Capacitive sensor-NM Series
- For analogue measuring of gas accumulation
- Reliable & continuous monitoring of Buchholz gases for early fault detection

Moisture sensor
- Constant monitoring of humidity in oil
- For early detection & preventive measuring
- Output of measured values via analogue & digital signals

Temperature sensor
- For continuous oil temperature monitoring
- Available separately or combined with humidity sensor

Buchholz Gas Tester BGT 4.2

Buchholz Gas Tester BGT 4.2

• Measuring and analysis of Buchholz gas directly on site
• Detection & analysis of H2, CO, CO2, C2H2, CH4+
• Enables to decide about the continuous operation of the transformer
• Easy handling via touch display
• Incl. Buchholz gas sampler BGS

Monitoring Relay for Tap Changers

Monitoring Relay for Tap Changers

The monitoring relay for tap changers, also known as
the protection relay for tap changers or oil flow relay, is
a monitoring device for insulating liquid-filled tap
changers with conservators. It protects the tap changer
and the transformer from damage. The monitoring
relay responds to excessive oil flow in the direction of
the conservator and generates a signal disconnecting the tap changer and the transformer immediately from
voltage supply.

News & Innovations

Gasrelay CF 38(Type 80) 

The gas relay can be used both on open-type transformers and hermetically sealed transformers. On open-type transformers with conservator the gas relay of type 80 can be used both as an air cell failure relay monitoring the hydro-type compensator (rubber sack) in the conservator, and as a gas r...| » Further reading 

Buchholz relay 3+3 

Buchholz relay with 6 independent contacts 3 contacts for alarm & 3 contacts for disconnection Also available with mechanical pre-alarm system | » Further reading 

Breathing Buffer Box G3B 

Ageing of the transformer's insulation system is accelerated by oxygen dissolved in oil. With open-type transformers oxygen consumed is replenished from the atmosphere. This longtime effect has negative implications. The breathing buffer box (G3B) inserted in the transformer's breathing line up...| » Further reading 


Otto-von-Guericke-Allee 12
39179 Barleben

Phone: +49 39203 790

Business matching
Get in contact with German companies in 3 easy steps! With one single question you can reach all relevant German Pavilion exhibitors of your selected industrial branch.

Click here if you notice an image that violates copyright or privacy rights.

Your personal organizer

Your personal organizer

Print list  |  Save as PDF
This is your personal organizer to manage your contacts to the German exhibitors.