JANCD-MB21

在自动控制电路中有以下保护环节，也是一般自动控制电路共有的保护环节。
（1）短路保护  电机、电器和导线的绝缘损坏或发生故障时，可能造成短路事故。很大的短路电流产生过热和电动力可能引起电器设备损坏，甚至因此引起火灾，因此要求一旦发生短路故障时，控制电路应能迅速地切断电路。
短路保护的常用方法是采用熔断器或断路器。这些保护装置不应受起动电流的影响而误动作。所以要按熔断器、断路器的选择和整定要求进行。
（2）长期过载保护和断相保护
电动机长期超载运行，绕组温升将超过其允许值，造成绝缘材料变脆、寿命缩短，严重时还会使电动机损坏。过载电流越大，达到允许温升的时间就越短。常用的长期过载保护元件是热继电器。热继电器不能兼作短路保护，因为发生短路时，它可能还来不及动作就已对电器设备造成损坏了。
据统计，因断相运行而烧坏电动机的台数，在有些单位竟多达损坏电机总台数的80%以上，所以电动机应该有断相保护的环节，也就是说要选用带断相保护功能的热继电器。
（3）零电压和欠电压保护
因某种原因电源电压突然消失，电动机都会停转。一旦电压恢复正常，如果电动机自行起动，往往会造成设备损坏或人身事故，也会因许多设备同时起动而造成对供电网络的过大冲击。因此，在电网电压消失时，要立即切断电源，实现零电压保护。
电源电压过分降低，会引起电动机转速下降甚至停转；在负载转距不变的情况下，电动机电流增大，造成绕组过热而损坏；电压过低还会引起一些电器释放，造成控制失常。因此，当电源电压降低允许值以下时，需要切断电源，实现欠电压保护。
起保停电路本身具有失压保护和欠压保护的功能。当电源失压或严重欠压时，接触器的衔铁自行释放，电动机停止运转。当电压恢复正常时，接触器线圈也不会自行通电，只有在操作人员再次按下起动按钮时，电动机才会起动。有的电路要求有更好的零压和欠压保护，还采用专门的欠压继电器或欠电压保护电路。
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Banner Engineering Q45UBB63DA / 44128 NSFP **GENUINE**

Cutler Hammer Eaton C340DGO NSFP **GENUINE** Westinghouse CH C340 DGO

Allen Bradley 802AD26P4S10 NSFP **GENUINE** AB 802A D26P4 S10

Allen Bradley 802AE26M4S7 NSFP **GENUINE** AB 802A E26M4 S7

Allen Bradley 802AB27P4S10 NSFP **GENUINE** AB 802A B27P4 S10

Cutler Hammer WMZT3C25 NSFP **GENUINE** WMZT 3C25 Eaton Westinghouse

Allen Bradley 700BX840A1 NSFP **GENUINE** AB 700 BX840A1

Allen Bradley 802AD27P4S10 NSFP **GENUINE** AB 802A D27P4 S10

Square D 9007C54FY1905 NSFP **GENUINE** 9007C5 4FY 1905

Cutler Hammer 9188913 NSNP **GENUINE** 9 1889 13 Westinghouse

Allen Bradley 100C23ZJ10 NSFP **GENUINE** AB 100 C23ZJ10

Allen Bradley 100C23ZJ10 NSNP **GENUINE** AB 100 C23ZJ10

Asco SYDB1A2 NSFP **GENUINE**

Banner Engineering Q45UBB63DAQ / 44129 NSFP **GENUINE**

Asco JKH8210G35 120V NSNP **GENUINE**

Asco KF8318D20MO 120/60 NSFP **GENUINE**

Asco WBIS8003A300 24VDC NSFP **GENUINE**

Allen Bradley 802TNX76 NSNP **GENUINE** AB 802T NX76

NAMCO EE53050400 NSFP **GENUINE** EE530 50400

General Electric CR161FB200477 NSNP **GENUINE** GE CR161 FB200477

General Electric SCOM1G NSFP **GENUINE**

Siemens 14BP12AA81 NSNP **GENUINE** Furnas

Asco 8263C63V NSNP **GENUINE**

Square D 9998UA81 NSFP **GENUINE** 9998 UA81

Furnas 42CE35AF106 NSFP **GENUINE** Siemens

General Electric TNIA400 NSFP **GENUINE**

Allen Bradley 47CN44002 NSFP **GENUINE** AB 47CN4 4002

Allen Bradley 47CN44002 NSNP **GENUINE** AB 47CN 44002

Furnas 14CP32AD NSFP **GENUINE** Siemens

Asco 8316G54 NSFP **GENUINE** 8316 G54

Allen Bradley 100C30DJ10 NSFP **GENUINE** AB 100 C30DJ10

Cutler Hammer E29VA1 NSFP **GENUINE** Eaton Westinghouse

Allen Bradley 500FAOD930 NSFP **GENUINE** AB 500F AOD 930

Asco 34200223 120/60 110/50 NSFP **GENUINE**

Allen Bradley 500FAOD930 NSNP **GENUINE** AB 500F AOD 930

Joslyn Clark 5UU676 NSNP **GENUINE** 5UU6 76

Siemens 42BF35AHBLG NSNP **GENUINE** Furnas

General Electric 2236024G062 NSFP **GENUINE**

Allen Bradley 800HNP11KF4AAXX NSFP **GENUINE** AB 800H NP11KF4AAXX

Allen Bradley 800MBDG24XXA NSFP **GENUINE** AB 800MB DG24XXA

Telemacanique LC1D3201P7 NSFP **GENUINE** Schneider Square D

Telemecanique XULM0600H7 NSFP **GENUINE** XULM 060 0H7

Asco 8321G3 120/60 NSFP **GENUINE**

Allen Bradley 592PB1FC NSFP **GENUINE** AB 592 PB1FC

Allen Bradley 592PB1GC NSFP **GENUINE** AB 592 PB1GC

Cutler Hammer Eaton E51KF143 NSNP **GENUINE** Westinghouse E51K F143

Allen Bradley 592PB1EC NSNP **GENUINE** AB 592 PB1EC

Allen Bradley 700P800A1 NSFP **GENUINE** AB 700 P800A1

Allen Bradley 700P800A1 NSNP **GENUINE** AB 700 P800A1

Cutler Hammer Eaton E51KF143 NSFP **GENUINE** Westinghouse E51K F143

Square D 8501PO2V02 NSFP **GENUINE** 8501 PO2 V02 Schneider Telemecanique

Allen Bradley 194EFA40 NSFP **GENUINE** AB 194E FA40

Allen Bradley 800HFKB16A NSFP **GENUINE** AB 800H FKB16A

Omron E3S5DB4 12-24VDC NSNP **GENUINE** E3S 5DB4

Banner Engineering B6 NSFP **GENUINE**

Siemens 3TF35110AC2 NSFP **GENUINE** Furnas

Cutler Hammer E54WAK30AT12SA NSNP **GENUINE** Eaton Westinghouse

Littelfuse LA070URD33TT10800 NSNP **GENUINE**

Bussmann SPP5H300 NSNP **GENUINE**

Siemens 6ED10521FB000BA8 NSNP **GENUINE** Furnas

Siemens ED63A040 NSFP **GENUINE** Furnas

General Electric 3S7505SS523E6 NSFP **GENUINE** GE

Siemens 3UA62002X NSFP **GENUINE** 3UA6 200 2X Furnas

Siemens ED63A005 NSFP **GENUINE** Furnas ED6 3A005

Allen Bradley 802TR3TD NSNP **GENUINE** AB 802T R3TD

Cutler Hammer AE16ANS0AC NSFP **GENUINE** Eaton Westinghouse

Asco EF8215G033 120/60 NSFP **GENUINE**

Square D 9001KXRL1 NSFP **GENUINE** Schneider Telemecanique

Allen Bradley 802TR3TD NSFP **GENUINE** AB 802T R3TD

Allen Bradley 802TR1TD NSNP **GENUINE** AB 802T R1TD

Allen Bradley 802TR7TD NSNP **GENUINE** AB 802T R7TD

Allen Bradley 802TR7TD NSFP **GENUINE** AB 802T R7TD

Square D 2510KW1H NSFP **GENUINE** 2510 KW1H

Allen Bradley 802TR1TD NSFP **GENUINE** AB 802T R1TD

Bussmann KRPC1200SP NSNP **GENUINE** KRP C 1200SP

Square D 9991SCA1 NSFP **GENUINE** 9991 SCA1 Schneider Telemecanique

Allen Bradley 2090XXNPMP16S20 NSNP **GENUINE** AB 2090 XXNPMP 16S20

Cutler Hammer DH261UGK NSFP **GENUINE** DH 261UGK Westinghouse

Joslyn Clark 13U3A16 NSFP **GENUINE** 13U3A 16

Asco 168621 NSFP **GENUINE**

Asco 8215B050 120V NSNP **GENUINE**

General Electric CR305S003AEA NSFP **GENUINE**

Telemecanique LC2D12F7 NSFP **GENUINE** LC2 D12F7

General Electric CR106251B NSFP **GENUINE**

General Electric CR305S002AEA NSFP **GENUINE** GE

Brush XL70F400 NSNP **GENUINE** XL 70 F 400

Brush XL70F400 NSNP **GENUINE** XL70F 400

Square D 9001SKRU4 NSNP **GENUINE** 9001 SKRU4 Schneider Telemecanique

Asco 8215G33 NSFP **GENUINE** 120/60 110/50 8215 G33

Asco 8215G33 NSNP **GENUINE** 120/60 110/50 8215 G33

Square D 9007C84D NSNP **GENUINE** 9007 C84D Schneider Telemecanique

General Electric 546A30102 NSFP **GENUINE** GE

Square D 9055A0125R NSNP **GENUINE** Schneider Telemecanique

Hubbell 560P5W NSFP **GENUINE** 560P 5W

Allen Bradley 800MR24HD5BB NSFP **GENUINE** AB 800MR 24HD5BB

Omron E32T16J NSFP **GENUINE** E32 T16J

Omron E32T16J NSNP **GENUINE** E32 T16J

Allen Bradley 800PF1CA NSFP **GENUINE** AB 800P F1CA

Allen Bradley 800PF1RA NSFP **GENUINE** AB 800P F1RA

Namco EE230333201 NSNP **GENUINE** EE230 333201

Joslyn Clark TB16210 NSFP **GENUINE** SYLVANIA

Joslyn Clark TB17110 NSFP **GENUINE** SYLVANIA

Allen Bradley 440NG02099 SER.B NSNP **GENUINE** AB 440N G02099

Hubbell 28316000 NSNP **GENUINE** 28316 000

Littelfuse JTD600ID NSFP **GENUINE** JTD 600 ID

Allen Bradley 700PL400A1 NSFP **GENUINE** AB 700 PL400A1

Allen Bradley 700PL400A1 NSNP **GENUINE** AB 700 PL400A1

Allen Bradley 800MRJ38KB NSFP **GENUINE** AB 800MR J38KB

Cutler Hammer C10CXA NSNP **GENUINE** Westinghouse

Siemens 3SE71501BF00 NSFP **GENUINE** Furnas

Asco 170190 NSFP **GENUINE** 170 190

Allen Bradley 836C4 NSNP **GENUINE** AB 836 C4

Allen Bradley 836C5 NSFP **GENUINE** AB 836 C5

Allen Bradley 199LJ1 NSFP **GENUINE** AB 199 LJ1

Allen Bradley 500LTAD93 NSNP **GENUINE** AB 500L TAD 93

Square D CH321N NSFP **GENUINE** Schneider Telemecanique

Asco EFL8210G002MB 120V NSFP **GENUINE**

General Electric 55152655G008 NSNP **GENUINE**

Telemecanique LC1D2510FE7 NSFP **GENUINE** Schneider Square D LC1 D2510F E7

General Electric CR104PES12 NSFP **GENUINE** CR104 PES12

Allen Bradley 1746A4 NSFP **GENUINE** 1746 A4

Asco EF8215G33 NSFP **GENUINE** 120/60 110/50 EF 8215 G33

Allen Bradley 42SP14001 NSFP **GENUINE** AB 42SP1 4001

Omron E2ECCR5B1U1 NSFP **GENUINE**

Omron E3DR3M4 NSNP **GENUINE** E3D R3M4

Furnas 46MT40* 120V NSNP **GENUINE** Siemens

Namco EA17014100 NSFP **GENUINE** EA170 14100

Joslyn Clark KTM20 NSNP **GENUINE**

General Electric CR205D102 NSFP **GENUINE** CR205 D102

Siemens 40EP12AJ NSNP **GENUINE** Furnas

Cutler Hammer 1550B6517 NSFP **GENUINE** 1 550B 6517 Eaton Westinghouse

Cutler Hammer E50BH1 NSFP **GENUINE** E50 BH1 Westinghouse

Allen Bradley 1771CA3B NSFP **GENUINE** AB 1771 CA3B

Square D 9007CR61A2 NSNP **GENUINE** SD 9007 CR61A2

Asco 8302D31F 120V NSNP **GENUINE**

General Electric CR245F111A NSFP **GENUINE**

Siemens 6EP13343BA00 NSNP **GENUINE** Furnas

Siemens 14CP32AA81 NSFP **GENUINE** Furnas

Allen Bradley 700P800DA22 NSFP **GENUINE** AB 700 P800DA22

Cutler Hammer A10BGOCC NSNP **GENUINE** Westinghouse

Gould Ferraz Shawmut Mersen RF400 NSNP **GENUINE**

Cutler Hammer C25FNF350A NSNP **GENUINE** C25FNF350A Eaton Westinghouse

General Electric CR101X112 NSFP **GENUINE** GE CR101 X112

Siemens 3RF24101BB06 NSNP **GENUINE** Furnas

Siemens 6ES71384FB030AB0 NSNP **GENUINE** Furnas

Cutler Hammer 1A00759G05 NSFP **GENUINE** Eaton Westinghouse

Siemens 3RV27111DD10 NSNP **GENUINE** 3RV2711 1DD10 Furnas

Square D 8501XTE2 NSFP **GENUINE** 8501 XTE 2

Square D 8501XTD2 NSNP **GENUINE** 8501 XTD2 Schneider Telemecanique

Square D 8501XTE1 NSFP **GENUINE** SD 8501 XTE 1

Square D 8501XTD1 NSFP **GENUINE** 8501 XTD1

Square D 2510FW2 NSFP **GENUINE** SD 2510 FW2

Allen Bradley 1756DPALEN NSFP **GENUINE** AB 1756 DPALEN

Square D 8501XMO40V02 NSFP **GENUINE** 8501 XMO40 V02

Square D 8501XTD1 NSNP **GENUINE** 8501XTD1

Asco EF8215G23 NSNP **GENUINE** EF 8215 G23

Square D 9050AO10E NSNP **GENUINE** 9050 AO 10E

Bussmann FWP1000A NSNP **GENUINE** FWP1000A

Square D 8501XTD2 NSFP **GENUINE** 8501 XTD2 Schneider Telemecanique

Square D 8501XMO40V02 NSNP **GENUINE** Schneider Telemecanique

Square D 8501XTE1 NSNP **GENUINE** SD 8501 XTE 1

Square D 9012GDW1 NSFP **GENUINE** 9012 GDW1 Schneider Telemecanique

Allen Bradley 800RR2TB NSFP **GENUINE** AB 800R R2TB

Allen Bradley 800RR3HA4RL NSFP **GENUINE** AB 800R R3HA4RL

General Electric 15D6G77 277v 60Hz NSNP **GENUINE** GE

Telemecanique LC1D65F7 NSFP **GENUINE** LC1D 65F7

Telemecanique XMLBM05A2C11 NSFP **GENUINE**

General Electric 22D154G2A NSNP **GENUINE** GE

Allen Bradley 800T2TAW NSFP **GENUINE** AB 800T 2TAW

Allen Bradley 871TA3A18FE12 NSFP **GENUINE** AB 871T A3A18FE 12

Square D 9012ACW20 NSFP **GENUINE** 9012 ACW 20 Schneider Telemecanique

Gould Ferraz Shawmut Mersen A6K125 NSNP **GENUINE**

Siemens ED63B020 NSFP **GENUINE** Furnas

Joslyn Clark TB1131 NSFP **GENUINE** TB113 1

Siemens 3RV10314BA10 NSFP **GENUINE** 3RV1031 4BA10

Cutler Hammer 10250T461 NSFP **GENUINE** 10250T 461 Westinghouse

Asco T840011 NSNP **GENUINE** 110/120 T 840011

Asco US8262C2 120V NSNP **GENUINE**

Square D L100WTL2M13 NSNP **GENUINE** Schneider Telemecanique

Cutler Hammer A6LES600T1 NSFP **GENUINE** Westinghouse

Allen Bradley 1747NP1 NSNP **GENUINE** AB 1747 NP1

Asco 068129 NSFP **GENUINE** 068 129

Allen Bradley 100SC43D04C NSFP **GENUINE** AB 100S C43D04C

Square D L100WTR2M12 NSFP **GENUINE** L100 WTR 2M12

Omron SRT2OD16T1 NSFP **GENUINE** 24 VDC SRT2 OD16T 1

Cutler Hammer 10250T461 NSNP **GENUINE** 10250T 461 Westinghouse

Asco EF8210G033 120/60 110/50 NSNP **GENUINE**

Allen Bradley 104NX67D NSFP **GENUINE** AB

Allen Bradley 871LD40EP40N4 NSFP **GENUINE** AB

Cutler Hammer 15RBA2125E NSNP **GENUINE** 15RBA2 125E Westinghouse

Allen Bradley 700DCN400Z24 SER.C NSFP **GENUINE** AB 700DC N400Z24

Cutler Hammer 9560H155949 NSFP **GENUINE** 9560H1559 49 Eaton Westinghouse

Cutler Hammer C340EG NSFP **GENUINE** Eaton Westinghouse

Asco 8215B63 120V NSFP **GENUINE** 8215 B63

Square D 9012ACW21 NSFP **GENUINE** 9012 ACW 21 Schneider Telemecanique

Allen Bradley 160BMB1 NSFP **GENUINE** AB 160 BMB1

Cutler Hammer A307Z25N NSNP **GENUINE** Westinghouse

Cutler Hammer 913241 NSFP **GENUINE** 9 1324 1 Eaton Westinghouse

Cutler Hammer 369D830G05 NSFP **GENUINE** Eaton Westinghouse

Cutler Hammer 505C806G1 NSNP **GENUINE** Eaton Westinghouse

Cutler Hammer 6041H201 NSFP **GENUINE** Eaton Westinghouse