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Air Pressure Switch MDR3 US Product detail Pressure switch MDR 3 1-phase or 3-phase Switching capacity up to 30 Amps / 600 V. Available with or without Overload Relay Max. cut-out pressure 508 psi 3-pole (N.C.) UL / CSA Approved, E86689 Part No. ON / OFF Air Connection Auto/Off Unloader Type Weight 31NEXXXX 30/40 psi 3/8" NPT No None 2 Lb. 31NEXAXX 30/40 psi 3/8"" NPT No 1/4" (EV3i) 2 Lb. 31EAXXXX 80/100 psi 1/4" NPT No None 2 Lb. 31EA3XXX 80/100 psi 1/4" NPT Yes None 2 Lb. 31EAXEXX 80/100 psi 1/4" NPT No 1/4" (EV3WBi) 2 Lb. 31EA3EXX 80/100 psi 1/4" NPT Yes 1/4" (EV3WBi) 2 Lb. 31EEXXXX 80/100 psi 3/8" NPT No None 2 Lb. 31EE3XXX 80/100 psi 3/8" NPT Yes None 2 Lb. 31EEXEXX 80/100 psi 3/8" NPT No 1/4" (EV3WBi) 2 Lb. 31EE3EXX 80/100 psi 3/8" NPT Yes 1/4" (EV3WBi) 2 Lb. 31ECXXXX 80/100 psi 1/4" NPT, 4-port No None 2 Lb. 31EC3EXX 80/100 psi 1/4" NPT, 4-port Yes 1/4" (EV1WBi) 2 Lb. 31QAXXXX 120/150 psi 1/4" NPT No None 2 Lb. 31QA3XXX 120/150 psi 1/4" NPT Yes None 2 Lb. 31QAXEXX 120/150 psi 1/4" NPT No 1/4" (EV3WBi) 2 Lb. 31QA3EXX 120/150 psi 1/4" NPT Yes 1/4" (EV3WBi) 2 Lb. 31QEXXXX 120/150 psi 3/8" NPT No None 2 Lb. 31QE3XXX 120/150 psi 3/8" NPT Yes None 2 Lb. 31QEXEXX 120/150 psi 3/8" NPT No 1/4" (EV3WBi) 2 Lb. 31QE3EXX 120/150 psi 3/8" NPT Yes 1/4" (EV3WBi) 2 Lb. 31QCXXXX 120/150 psi 1/4" NPT, 4-port No None 2 Lb. 31QC3EXX 120/150 psi 1/4" NPT, 4-port Yes 1/4" (EV1WBi) 2 Lb. 31LAXXXX 145/175 psi 1/4" NPT No None 2 Lb. 31LA3XXX 145/175 psi 1/4" NPT Yes None 2 Lb. 31LAXEXX 145/175 psi 1/4" NPT No 1/4" (EV3WBi) 2 Lb. 31LA3EXX 145/175 psi 1/4" NPT Yes 1/4" (EV3WBi) 2 Lb. 31LEXXXX 145/175 psi 3/8" NPT No None 2 Lb. 31LE3XXX 145/175 psi 3/8" NPT Yes None 2 Lb. 31LEXEXX 145/175 psi 3/8" NPT No 1/4" (EV3WBi) 2 Lb. 31LE3EXX 145/175 psi 3/8" NPT Yes 1/4" (EV3WBi) 2 Lb. 31LCXXXX 145/175 psi 1/4" NPT, 4-port No None 2 Lb. 31LC3EXX 145/175 psi 1/4" NPT, 4-port Yes 1/4" (EV1WBi) 2 Lb. 31TAXXXX 215/250 psi 1/4" NPT No None 2 Lb. 31TA3XXX 215/250 psi 1/4" NPT Yes None 2 Lb. 31TAXEXX 215/250 psi 1/4" NPT No 1/4" (EV3WBi) 2 Lb. 31TA3EXX 215/250 psi 1/4" NPT Yes 1/4" (EV3WBi) 2 Lb. 31TEXXXX 215/250 psi 3/8" NPT No None 2 Lb. 31TE3XXX 215/250 psi 3/8" NPT Yes None 2 Lb. 31TEXEXX 215/250 psi 3/8" NPT No 1/4" (EV3WBi) 2 Lb. 31TE3EXX 215/250 psi 3/8" NPT Yes 1/4" (EV3WBi) 2 Lb. 31TCXXXX 215/250 psi 1/4" NPT, 4-port No None 2 Lb. 31TC3EXX 215/250 psi 1/4" NPT, 4-port Yes 1/4" (EV1WBi) 2 Lb. 31UEXXXX 310/360 psi 3/8" NPT No None 2 Lb. 31UE3XXX 310/360 psi 3/8" NPT Yes None 2 Lb. 31VEXXXX 450/500 psi 3/8" NPT No None 2 Lb. 31VE3XXX 450/500 psi 3/8" NPT Yes None 2 Lb.