The MESSKO MPREC® pressure relief device protects distribution and power transformers, electric coils and tap changers reliably and safely in the event of sudden pressure increases. Special variants for directed oil flow and applications fulfill nearly all requirements in the offshore area or in wind turbines. When the defined response pressure (4 to 30 psi) is reached, the valve plates and signal pin lift and the main switching contacts are triggered within 2 milliseconds. The proven design and perfectly coordinated springs ensure that the pressure relief device closes again securely.