Designed to provide electrical indication that a rupture disc has burst and a relief valve has discharged, pressure switches from Hansen Technologies Corp. are UL listed and CSA recognized. When this rupture occurs, the pressure relief valve will reseat after discharging while the rupture disc remains open. With an ambient temperature range of -20 to 125oF (-29 to 52oC), the NEMA 4X-rated switch will maintain the signal until a new rupture disc is installed and the pressure is reduced to zero.