熱繼電器是利用電流的熱效應(yīng)原理實(shí)現(xiàn)電機(jī)的過(guò)載保護(hù)的。

電動(dòng)機(jī)在工作時(shí)，當(dāng)負(fù)載過(guò)大、電壓過(guò)低或發(fā)生一相斷路故障時(shí)，電動(dòng)機(jī)的電流都要增大，其值往往超過(guò)額定電流。如果超過(guò)不多，電路中熔斷器的熔體不會(huì)熔斷，但時(shí)間長(zhǎng)了會(huì)影響電動(dòng)機(jī)的壽命，甚至燒毀電動(dòng)機(jī)，因此需要有過(guò)載保護(hù)。熱繼電器用于電動(dòng)機(jī)的過(guò)載保護(hù)，它是利用電流熱效應(yīng)使雙金屬片受熱后彎曲，通過(guò)聯(lián)動(dòng)機(jī)構(gòu)使觸點(diǎn)動(dòng)作的自動(dòng)電器。圖1-23是熱繼電器的結(jié)構(gòu)及圖形符號(hào)。

它由發(fā)熱元件、雙金屬片、觸點(diǎn)及一套傳動(dòng)和調(diào)整機(jī)構(gòu)組成。發(fā)熱元件是一段阻值不大的電阻絲，串接在被保護(hù)電動(dòng)機(jī)的主電路中。雙金屬片由兩種不同熱膨脹系數(shù)的金屬片輾壓而成。圖中所示的雙金屬片，下層一片的熱膨脹系數(shù)大，上層的小。當(dāng)電動(dòng)機(jī)過(guò)載時(shí)，通過(guò)發(fā)熱元件的電流超過(guò)整定電流，雙金屬片受熱向上彎曲脫離扣板，使常閉觸點(diǎn)斷開(kāi)。由于常閉觸點(diǎn)是接在電動(dòng)機(jī)的控制電路中的，它的斷開(kāi)會(huì)使得與其相接的接觸器線圈斷電，從而接觸器主觸點(diǎn)斷開(kāi)，電動(dòng)機(jī)的主電路斷電，實(shí)現(xiàn)了過(guò)載保護(hù)。

備貨，備貨，降降降，火火火，火火火……
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公司名稱(chēng)：廈門(mén)泰尼電氣有限公司
聯(lián)系人：小黃（銷(xiāo)售代表）
聯(lián)系電話：0592-6809319
傳真號(hào)碼：0592-6890859（麻煩備注01006收）
手機(jī)：189-5019-1386微信同號(hào)
QQ號(hào)碼:2917675397
地址：廈門(mén)市海滄區(qū)海滄農(nóng)場(chǎng)海農(nóng)北里17號(hào)
誠(chéng)信經(jīng)營(yíng)，質(zhì)量為首，誠(chéng)信至上，泰尼電氣小黃竭誠(chéng)為您服務(wù)！！！
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Novellus 02-160858-00 Bay P/N: 8287-03
Siemens simatic 6ES5355-3UA11 with 6ES5377-0BB41
Siemens simatic 6AV1242-0AB10 with 6ES5373-0AA81
Omron C500-AD001 3G2A5-AD001
Panasonic video frame memory VS-7014A Opt: MOD
Motorola MVME 147SRF 
HP 54600B 100MHz oscilloscope
Heidenhain LIDA 19W Id.Nr.256 746 01
Sigma Koki stage XY axis
Agilent 41420-61701 Quadrax cable (3m)
Shimadzu parts 206-81303
Matsushita NAiS CPU MEWNET-H Link A/D D/A IN64 FP3 PLC
Shimadzu parts 228-15733-91
ICT teradyne 4550007H-H SICE 020006U-C
Tektronix CFG280 11MHz function generator
Shimadzu parts 225-03586-91
Omron C200HW-NC213
Matsushita NAiS CPU MEWNET-H Link A/D D/A IN64 OUT32
Omron C200HW-NC113
Yaskawa servopack SGDM-01ADA ver.5063E
Siemens simatic 6ES5526-3LA22 with 6ES5373-0AA81
Shimadzu parts 228-14439-91
Bruel & Kjaer 25KHz input module 3015Anritsu power sensor MA72A
Bruel & Kjaer 3017 sound intensity module
Bruel & Kjaer signal analyzer interface module 7521
Millipore adaptorr AC-4 AC413C REVD
JDS uniphase 2110U-SLCPEB Ultra laser 2218-010SLCPEB
Parker slide 802-9117B 55mm movement
Vexta 5-Phase Driver UDK5128NW2
VAT adaptive pressure controller PM-7 P/N: 235617
Vexta 2 phase driver UDK2120
Adaptec AHA-2930U2
Comtrol 95760-7/95761-4 PCI 8 A10075 Rev. D
HP 54645D mixed signal oscilloscope & HP 54659B
JDS uniphase 2118U-010SLCPEB Ultra laser 2218-010SLCPEB
Siemens 6ES5 374-1KH21 6ES5374-1KH21
Siemens 6ES5 374-1FH21 6ES5374-1FH21 memory card
Vexta oriental 5 phase motor UDK5214NW
Agilent 1671G logic analyzer Opt: 001 003
Vexta oriental 5 phase motor UDK5214NW-M
Physik instrumente 910-276
Fenwal controls SDP-CTU
PRI Automation PRE-200
Point Grey Grasshopper GRA-03s3M GRAS-03S3M-C with lens
Honeywell IACD UNC2000 DC2003-0-0000-0000-00-0122
Genrad 9009-0459-01 [A] 9004-0459-01 9004-045901A
Gatan EELS compatible TV Control 676-1100
Gatan stem interface 679-3400
Schneider TWDDDI8DT
Aerotech ES14681-12 (ANT-25LV)
Hyamp II 5030DT gound bond tester ver 1.60
Oriental D107-A4 (3 pcs), D114-A4 (2 pcs)
Micron optics picoWave FBG-IS Version 3
Siemens simatic U-04B
ISOMET D325-BS deflector driver
Kimura Denyoki TDI-1100P weld schedule program/monitor
Trek 601C 601C-1-H-CE-EX
JAI CV-M531 CCD camera
Melec C-820A
Schleicher UNG 24(A) 31210048 730 124
Micrion 150-1810 rev. B1 150-001810
Melec C-781S
Micrion 150-891 Rev. G5
Micrion 150-892 Rev. G5
Omron G730-VID08-1 remote terminal 24VDC
Oriental motor MSP301N
Vexta 5-phase driver UDX5107
Yamatake DMC10 DMC10D2TV0100
Omron G730-VOD16-B remote terminal 24VDC
Siemens power 10 6EP1334-2BA00
Omron 3G2A3-ID411 I/O device
Micrion 150-1083 rev. D4 assy no. 150-00180
Micrion 150-1110 Rev. B assy no. 150-001110
Moeller CAN-BRIDGE CAN-24DI CAN-16DO CAB-4AO
Micrion 150-1381 Rev. C7
Micrion 150-1850 Rev. B6 assy no. 150-001850
Systemation 114284 24 point DC input
Systemation 114285 24 point DC output
Micrion 150-1090 Rev. C5
Bit 3 computer corporatio?n 614-202
Micrion 150-1130 Rev. D1
Micrion 150-2100 Rev. A assy no. 150-002100
HP M1021A T SVO2 module
Keyence LX2-60
Excel receiver 1031F (set of 3)
Takatori motor-cont?roller PG-117 CPU-171 ES-50
Accura 7 automatic dispenser
Siemens AUT5 MCH 00300686-0?4 NEW
Cole Parmer 32915-56
B&R Minicontro?l PEA & CPU & MAEB PLC
Delta Tau ACC34A 64-bit opto-I/O
Omron C200H-PRO2?7
Woodward governor real power sensor 8272-394 B
Woodward automatic generator load control 9905-096 H
Mitsubishi melsec AJ55TB3-16?D
Mitsubishi melsec AJ55TB3-8D
Woodward digital reference unit P/N: X8272-683 rev: NEW
JVC remote control unit RM-P250 "NEW"
Phoenix megalink 5575A with channel monitor 
HUMO HC6002 HC-6002-2
Siemens AUT5 00328492-0?1 KSP-NTS50-?12 NEW
Siemens AUT5 00330648-0?2
HUMO HC6800 HC-6800-2
RSF Elektronik MSA6701 linear encoder
VICI Valco instrument?s A 60 HT 2-98
VAS600-03-?112 
VICI Valco instrument?s AT 60 6-01
KLA BOARD 6001755-02
VICI Valco instrument?s AT 60 8-01
VICI Valco instrument?s AT 60 9-06
Kyowa EMZ-D & Sony CCD 92D & moritex illuminato?r
Tiyoda TB9007-04 board
Keyence KV-16R
Canon BH4-0542 use on Canon PLA
Shimadzu parts 202-50445-?01 filament
Celerity RFS2 RATIO FLOW SPLITTER
Shimadzu parts 204-01919-?03
Shimadzu parts 060-48214-?01
Shimadzu parts 228-32953-?04
Shimadzu parts 221-18531-?92
Omron PRO27 programmin?g console
Schaffner NSG 432 static discharge simulator 2 to 25kV
Landmark graph LMG-M
NAG system NM-325A weld monitor
SynOptics Lattisnet Model 3002 460W Power Supply
MITSUBISHI input unit AX41C
Mitsubishi AOJ2-E56AS A0J2-E56AS
Aerotech motor BM200 UF/ES13476 & BM200E/ES1?3476-1
SynOptics LattisNet 3505B Token ring UTP Host 920-178-A
Omron SCY-M1 ID011 OD041 CN040 PLC assembly
Sieger gas alarm FS4 02704-A-34?0
Omron SCY-M1 CPU55 DI003 DO003 MD001 ID011 CN040 PLC 
SynOptics LattisNet 3505B Token ring STP/UTP Host
Quantum automation QDAF06 variable air damper motor
Applied Motion Prod. 2035 Motor Controller?s
Parker Compumotor AXL AX57-102-E microstep drive
Kenwood PS20-18
SynOptics LattisNet 3513 Token ring STP Rptr NMM
Yamatake honelwell CB1086DPA0?000
PairGain HDSL with UTU-804 G.703 Nx64K
SynOptics LattisNet 3505B Token ring STP/UTP Host
Shimadzu 228-35324-92 FCV-13AL (E) NEW
Agilent 04142-61023
SynOptics LattisNet 3505B Token ring STP/UTP Host
P.A.L.M. Microlaser technologies
Oriental D114-A4 (4 pcs)
Panasonic driver ADKB200BPF?BMA
Siemens 6ES5 942-7UB11 with 6ES5 375-1LA21