Buchholz gas relay ABR-25

Completely replace models:


Product description

The relay is designed to protect oil-filled transformers, autotransformers and reactors with expander against damages inside the tank that cause gas emission, drop in oil level or oil flow from the tank to the expander

Operating principle

The main parts of the relay are the housing and the actuator. The actuator uses two floats and a damper. The floats are responsible for signalling a build up of gas and a drop in the oil level in the relay to the alarm level. The slide valve is an indicator of the oil flow rate through the relay. If the shutter changes its position, it means that the oil flow rate has exceeded the relay trip threshold.

The relay is equipped with a switching system – “dry” contacts



  • Oil flow rate setting: 0.65; 1.0; 1.5; 2.0; 2.5; 3.0 m/s
  • DC/ac voltage: 250 V
  • Switchable current, max: 2,5 А


8 housing options

The best manufacturer price

Tight production times

Quality guarantee up to 5 years

Delivery anywhere in the world

Customisation and equipment options

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Завод «АTF»
Россия, Тольятти, Коммунальная улица, 16
+7 (800) 200-63-18