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NPN是指当有信号触发时，信号输出线out和电源线VCC连接，相当于输出高电平的电源线。
对于NPN-NO型，在没有信号触发时，输出线是悬空的，就是VCC电源线和out线断开。有信号触发时，发出与VCC电源线相同的电压，也就是out线和电源线VCC连接，输出高电平VCC。
对于NPN-NC型，在没有信号触发时，发出与VCC电源线相同的电压，也就是out线和电源线VCC连接，输出高电平VCC。当有信号触发后，输出线是悬空的，就是VCC电源线和out线断开。
对于NPN-NC+NO型，其实就是多出一个输出线OUT，根据需要取舍。
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订单配送查询 INGERSOLL RAND 30305726 2-3/4IN ConNECTING ROD BUSHING CYLINDER D398514
CARBORUNDUM GC60-H11-VR SET OF 2 7X1X1-1/4IN GRINDING WHEEL D407083
M-24987-066 6 IN OD X 4.25 IN ID X 0.50 IN THICK RUBBER WASHER D404925
SMC SV3000-52U-1A-N?11 EDGE SLEEVE LINE ENDPLATE REPLACEMENT PART D422652
PARKER DG107/08SA3C 17451 ERMENTO STEEL HYDRAULIC FITTING D306057
ANDERSON M4TVS-4 INSTRUMENT 1/2IN NPT TRANSMITTER MANIFOLD REPLACEMENT B396014
FISHER 16A7908X012 VALVE STEM 1-1/2IN TYPE 92E REPLACEMENT PART D302635
BURKS 21942-P 1-1/8 IN MECHANICAL STAINLESS PUMP SEAL D415567
FISHER 1N5882-000A2 STAINLESS STEM & STEEL PLUG ASSEMBLY D489896
5331 14.62X1.12IN STEEL SHAFT D405524
FIKE PV BT SIZE 3 VALVE DISC RUPTURE 160.72PSI REPLACEMENT PART B480311
42B/229S6 74TOOTH 1-1/4IN BORE GEAR REPLACEMENT PART D341256
MARTIN TS2080 5/8IN BORE STEEL SPUR GEAR D503883
COLUMBIA MACHINE 3.1794-229 8-1/4 IN LONG 1 IN DIA DRIVE SHAFT D450695
G&H 96111992137 VALVE O-RING EPDM REPLACEMENT PART D303572
FOSTER 50MPS QUICK DISConNECT PLUG STAINLESS FITTING 1/2 IN NPT D211503
CHESTERTON 010334 1 X 2 X 0.5 PUMP PACKING RING GRAPHITE D477207
AIRTEC 40-004-060-18 1/8 IN ELBOW 6MM TUBE PNEUMATIC FITTING D436641
JOHN CRANE B00603 GOULDS 3196MT 1-3/4 IN PUMP SEAL D509370
TRD EN-AC437-X1 ROD ALIGNING COUPLER D385705
SPIRAX SARCO MFP 14 1360880 COVER GASKET SET REPLACEMENT PART B452208
TYCO DB18M/S REPAIR KIT DIAPHRAGM VALVE REPLACEMENT PART B447038
SIEMENS SQM50.461R1G3R 4-20MA 110-120V-AC REVERSING ACTUATOR B380879
FESTO QS-1/4-8-I 153016 TUBE MALE STRAIGHT PNEUMATIC FITTING D427347
CLOW 154-6 SUPER BELL-TITE GASKET SEAL D409170
37-3/4IN LENGTH 3-1/8IN OD ROLLER ConVEYOR REPLACEMENT PART D381017
GOULDS 10179557 8-1/4IN DIAMETER 5 VANE STAINLESS PUMP IMPELLER B392632
VERSA MATIC DRV1.25 FG 1-1/4 HYTREL ELASTOMER KIT DIAPHRAGM PUMP D503926
DELTA SYSTEMS L26M030139 INFEED 26-7/8X1-1/4IN TO 1IN STEEL SHAFT D246305
ASCO 99-019 RED-HAT REPAIR KIT SOLENOID VALVE D482383
NUMATICS MK40-K2 REPAIR KIT SOLENOID VALVE REPLACEMENT PART D284029
GEMINI A411 125PSI 1/8X1/4IN NPT PNEUMATIC ACTUATOR REPLACEMENT PART D365227
VICKERS CVCS-25-N-S2-10 CARTRIDGE COVER HYDRAULIC VALVE REPLACEMENT PART B325337
BANSBACH 107033 K0A1BF2-083-289?/735N EASYLIFT 83MM STROKE D459229
CREMER BR2-15-05 151MM LONG 25MM OD SHAFT REPLACEMENT PART D422812
MARTIN S20111 14-1/2 1/2 IN BORE GEAR REPLACEMENT PART D435957
PACIFIC 02-032-00 S32 32 TOOTH 7/8IN ID GEAR D302115
TRUTORQ TSR-2-F03 4/4 STD PNEUMATIC 150PSI ACTUATOR REPLACEMENT PART B471892
RA JonES CMC299 24-1/4X7/8IN STEEL ROTATION SHAFT D391512
DRESSER 3IN SUCTION 2IN DISCHARGE PUMP CASING STEEL REPLACEMENT PART B234592
DIAMOND C2100H E2 CP CLSF EXTENDED link CHAIN REPLACEMENT PART D259739
DOBOY 327298 ADJUSTING SCREW 13-1/8X1/2IN SHAFT REPLACEMENT PART D266787
GOULDS 100-488 1203 3196 10-5/8IN OD STAINLESS STUFFING BOX COVER D517307
211-30064-B STEEL 18-1/4IN LENGTH SHAFT D335788
NELES JAMESBURY IMO-1 RKA46 2IN BALL VALVE REPLACEMENT PART B418310
190480 26 TOOTH 57.190 1IN BORE MITER GEAR REPLACEMENT PART B420955
CORY ConVEYOR E0009796 12-1/2IN ROLLER ConVEYOR REPLACEMENT PART D360864
CASHIN 3027-3106 1/2IN BORE GEAR D222010
3/4IN SHAFT 31X3-3/4IN ROLLER ConVEYOR D332017
MARTIN BS1050-2H 3/4IN BORE BEVEL GEAR REPLACEMENT PART D377316
PARKER 3F4C80 SOLENOID VALVE COIL 24V-DC REPLACEMENT PART D462631
FISHER 1N931336012 6IN SHIM SEAL BALL VALVE STAINLESS D335120
LINCOLN SL-44 83749-5 CENTRO-MATIC LUBRICATOR 1/8 IN NPT REPLACEMENT D383220
ROCKWELL 36124 MOLDED STEM PACKING KIT 1/2IN REPLACEMENT PART D360927
INGERSOLL RAND 95939252 2IN NPT X 32JIC TEE FITTING D508789
VALBIA DA-32 PNEUMATIC 10BAR SIZE 32 ACTUATOR REPLACEMENT PART B484762
DOBOY 408331 6 PORT ONE TOUCH 10MM PNEUMATIC FITTING D387600
SPX 060098000 STAINLESS PUMP SHAFT SLEEVE REPLACEMENT PART D398002