Buchholz flow switch ARF-25

Completely replace models:


Product description

The relay is designed to protect oil-filled transformers, autotransformers and reactors with an oil conservator against damage to the on-load tap-changer interior which causes oil flow from the on-load tap-changer to the oil conservator

Operating principle

The main parts of the relay are the housing and the actuator. The actuator uses a permanent magnet to set the damper, which in the operating position stands across the flow. As the flow rate increases, the force with which the flow is exerted on the damper increases. As soon as the force of the flow exceeds that of the magnet, the relay is actuated.

At this point, the arc magnet acts on a reed switch, which, by changing its state, transmits an electrical signal to trigger the flow switch


  • Oil flow rate setting: 0.65; 0.9; 1.2; 1.5; 2.0; 2.5; 3.0 m/s
  • DC/ac voltage: 250 V
  • Current to be switched, max: 2,5 А


2 housing variants

The best manufacturer price

Tight production times

Quality guarantee up to 5 years

Delivery anywhere in the world

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