JOAP - Pressureswitches

Operating Principles SPST auto reset SPST manual reset NSDHA – NSDLA - NSDHF NSDHM Operating principle Stainless steel diaphragm expands and contracts itself under the effect of pressure. The movement of the diaphragm actuates a plunger, which operates the opening or the closing of the electrical contact. The switch automatically resets when pressure reaches, by increasing or decreasing, the nominal value. When system pressure increases higher than nominal, diaphragm expands itself, pushing the safety disc in blocking position, and simultaneously, interrupting the electric contact. When pressure decreases, diaphragm contracts itself, while the disc remains in the safety locked position; unlocking step takes place manually, through reset button. The button simultaneously operates the reset of the electrical contact. Typical Application High and low pressure protection of refrigeration, air-conditioning systems, ice maker etc. It can also be used to control pressure in hydraulic and steam systems, air compressors and industrial equipments. All air conditioning and refrigeration systems that require protection from particularly High Pressure, and where the operator intervention is necessary to restore operating conditions. They can be directly installed on the pipeline or on the control panel. Proof pressure at working pressure <10 bar 17 bar / 10…27,5 bar 41 bar 41 bar >27,5 bar 55 bar 55 bar Pressure range -1 ~ 55 bar 10 ~ 55 bar Burst Pressure 345 bar 345 bar Contact rating 250Vac 6A (inductive); 36Vdc 3A; 24Vac 125VA; 1 20Vac 375VA; 240Vac 375VA (pilot duty) - 50/60Hz 250Vac 3A (inductive); 24Vac 125VA; 120Vac 375VA; 240Vac 375VAv (pilot duty) - 50/60Hz SPDT: 24Vac 125VA; 120/240Vac 375VA Cycles life 100.000 10.000 Approvals CE0035 - PED CAT IV – VDE - UL CE0035 - PED CAT IV - UL Electric Drawing Normal Close Normal Open Normal Close Structure Drawing