品牌:P0970EJ
起订:1个
供应:99个
发货:1天内
信息标签:P0970EJ,供应,机械及行业设备,商业专用设备
答:熔断器在电气线路中主要起短路保护和严重过载保护作用,而热继电器主要用于过载保护.两者不能互为代用,但可以互为补充.如果用熔断器作电动机的过载保护,为了防止电动机在启动过程中熔断器熔断,熔断器熔体的额定电流一般应取电动机额定电流的2. 5~3倍,这样即使电动机长时间过负荷50%,熔断器也不会熔断,而电动机可能因长时间过负荷而烧坏.所以不能用熔断器作过负载保护.而热继电器是利用电流的热效应来工作的,由于热惯性的影响,尽管发生短路时电流很大,也不可能使热继电器立即动作,这样就延长了短路故障的影响时间,对供电系统及用电设备会造成危害.所以也不能用热继电器作为短路保护.
对于电热及照明设备,由于负载的性质不同于电动机的拖动负载,一般来说,它们不会出现过负载现象,所以,一般不装备热继电器,而只装备熔断器,主要起短路保护作用.
CCES IO PRODUCTS IOD-64/S02 ISOLATED I/O BOARD 32ZDIO64-00 REV. C 01110457
GRACO PUMP SEAL REAPAIR KIT 218-737 / 218-735 / 218-739
GE SPECTRA RMS TR16B1000
CROMPTON 549-15 TIME METER 205769*1, 549-156A-PNC6-ZH
TELEMECANIQUE STBNDN2212
ALLEN BRADLEY 871L-XCB15Q40
NAMCO EB200-30043 SOLENOID W/ EB201-83193 COIL 110V, 50/60HZ, EB20030043
ROSS 8077B3342 PNEUMATIC PILOT VALVE 115V, 60HZ, BAR 2-10, NE2-1
ASEA / ABB QANC-210 7J YL261001-FD
REPAIRED HonEYWELL 621-4502
RENBRANDT C67F67F
FENNER MODEL RC272 OSCILLATOR AND FREQUENCY SCALER 32001330
GE FANUC IC697MDL250 INPUT MODULE 32POINT 120VAC, 44A731657-003
LOVEJOY / SIER-BATH M252920
VICKERS DGMC-3-PT-CW-31
ALLEN BRADLEY 2760-RB
SCHRADER BELLOWS 094502001 MODULAR BALL VALVE ASSY. 94502001
OMRON CS1W-BI102
SMC CDRB1BW50-180SE
FESTO ELECTRIC STAF-32-20-P-A-R
LEYBOLD VACUUM PRODUCTS 20014629
REPAIRED HAUHINCO 6358470 HYDRAULIC VALVES 700BAR
KASON HDWE. CORP. 1055 FORGED BRASS HINGE 1-1/8
NUMATICS 554SA43BK046T30
VERSA VSG-3511-HC-M-U-10-14-55M-D024
PARKER D1VW020BNJWG HYDRAULIC VALVE 24 VDC, 1.19-1.32A, D1VW020BNJWG-82
ALLEN BRADLEY 509-AOD
LEYBOLD TECH 58073033 AV04 CARD PRUF-NR 09506174
BURNS 14372 HEAD EXPLOSION PROBE WSP5K1-6-3AR3 W/ HT-125044
RED LION ConTROLS APLCL400
GE FANUC IC660ELA020A
STANDFAST CH125 X 50
COMPACT AIR PRODUCTS S212X38 CO104A
FUGI ELECTRIC SC-2SN/SEUL
RACINE BOSCH FD4-DAHS-101S-32
IN BOX ESAB GENUINE HELIARC 33697 POWER CABLE FOR HW-26, HW-26R, HW-26F
PARKER CP0M3D-10
BIJUR D-3940 PRESSURE MonITOR W/ D-3677
STEEL CABLES 27'-5" TWAY 3/8" GALVANIZED 7X19 GAC W/ CB12 & TTS-12A
DADCO 95.5000.75.TNF1
PARKER D3W1CNYW30xB625
NUMATICS RC-484129-2 CYLINDER P1AM-04A61-BAA0
REGINA UP879TK3.1/4
VICKERS SPERRY RAND CT-06-B-40
SHEFFER CORP ID 2091361-1 HYDRAULIC CYLINDER MOD 3C20FF4
NORTON QUALITY #035001 1/2" X 3" GRINDING WHEELS 18080 RPM B83828
GRAPHIC ConTROLS FOXBORO PN-00233791
DADCO 90.5B.1500.075.TK NITROGEN GAS SPRING 90.105.952 MD1300
EATON HYDRO-LINE HR5F-2X6-H-1-2-N-H-N-2-2-HB01ZH
FUGI ELECTRIC SC-2SN/SEUL MAGNETIC ConTACTOR SC2SNSEUL
RACINE BOSCH FD4-DAHS-101S-32 VALVE 655352, 110/115V, 50/60HZ , 3000PSI
IN BOX ESAB GENUINE HELIARC 33697 POWER CABLE FOR HW-26, HW-26R, HW-26F
PARKER CP0M3D-10 GU CHECK VALVE CP0M3D10
BIJUR D-3940 PRESSURE MonITOR W/ D-3677
STEEL CABLES 27'-5" TWAY 3/8" GALVANIZED 7X19 GAC W/ CB12 & TTS-12A
DADCO 95.5000.75.TNF1
PARKER D3W1CNYW30xB625
NUMATICS RC-484129-2 CYLINDER P1AM-04A61-BAA0
REGINA UP879TK3.1/4
VICKERS SPERRY RAND CT-06-B-40
SHEFFER CORP ID 2091361-1 HYDRAULIC CYLINDER MOD 3C20FF4