PRESSURE SWITCH Tested and approved TÜV (Technischer Überwachungs Verein) in accordance with EN 12263 B = Druckbegrenzer (Pressure switch with external reset) S = Sicherheitedruckbegrenzer (Pressure switch with internal reset) In compliance with EN 12263, a rupture of the high pressure bellows in the switch will stop the refrigeration plant compressor. It will not be possible to restart the compressor until the pressure switch has been replaced. A rupture of the outer bellows will cause the break pressure of the switch to fall approx. 3 bar under the set value. This means that the switch will break at normal condensing pressure, i.e. a „fail safe“ function is ensured. The B side can be reset with the external button when the pressure has fallen approx. 4 bar under the set stop pressure. The S side can be reset with the internal button when the pressure has fallen approx. 4 bar under the set stop pressure.