bladder rupture relaybladder rupture relay

Bladder Rupture Relay- BRR

The Bladder Rupture Relay (BRR) is associated with the STP rubber bag transformer. It is an intelligent system capable of detecting any abnormal liquid present in the preservative membrane. For example, it can detect oil in case of leakage or condensation due to a dryer problem.

The system consists of :

  • an optical sensor,
  • a connection box,
  • and an LED control unit.

First, the optical sensor is placed in the compensator, through the flange. The installation can be done during the assembly or during a maintenance operation. The connection box is used to connect the sensor to the external control unit installed in the transformer’s electrical panel.

Equipped with two leds, the control unit allows a permanent visual monitoring. The red LED indicates the anomaly, the green LED indicates the normal situation. Thus, the BRR Bladder Rupture Relay avoids unnecessary maintenance costs and time.



  • Full-time visual monitoring
  • Quick leak detection
  • Installation during assembly


  • Failures anticipation
  • System protection
  • Intelligent alarm


  • Compatible with Pronal products
  • Optical liquid detection
  • Transformer connectivity

Detailed information

  • Kit contents:
    • 1 optical sensor with a 5 m cable
    • 1 connection unit
    • 1 outside control relay with LEDs
  • Temperature resistance: -20°/+100°C

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Our design department employs the best project leaders and designers and will be pleased to develop and create a tailor-made product specially for your unique project.


Composition / Advice

Installation advice
Install permanently with an STP bladder or use it on a one-off basis for on-site checks during maintenance work.

Standards / regulations

Standardized control unit IP20, standardized sensor IP67.


Fact Sheets / Business Guides
  • This field is for validation purposes and should be left unchanged.


1 optical sensor with a 5 m cable
1 connection unit
1 control relay with LEDs
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