热继电器是利用电流的热效应原理实现电机的过载保护的。

电动机在工作时，当负载过大、电压过低或发生一相断路故障时，电动机的电流都要增大，其值往往超过额定电流。如果超过不多，电路中熔断器的熔体不会熔断，但时间长了会影响电动机的寿命，甚至烧毁电动机，因此需要有过载保护。热继电器用于电动机的过载保护，它是利用电流热效应使双金属片受热后弯曲，通过联动机构使触点动作的自动电器。图1-23是热继电器的结构及图形符号。

它由发热元件、双金属片、触点及一套传动和调整机构组成。发热元件是一段阻值不大的电阻丝，串接在被保护电动机的主电路中。双金属片由两种不同热膨胀系数的金属片辗压而成。图中所示的双金属片，下层一片的热膨胀系数大，上层的小。当电动机过载时，通过发热元件的电流超过整定电流，双金属片受热向上弯曲脱离扣板，使常闭触点断开。由于常闭触点是接在电动机的控制电路中的，它的断开会使得与其相接的接触器线圈断电，从而接触器主触点断开，电动机的主电路断电，实现了过载保护。

备货，备货，降降降，火火火，火火火……
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公司名称：厦门泰尼电气有限公司
联系人：小黄（销售代表）
联系电话：0592-6809319
传真号码：0592-6890859（麻烦备注01006收）
手机：189-5019-1386微信同号
QQ号码:2917675397
地址：厦门市海沧区海沧农场海农北里17号
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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 b 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 b
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 megab 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 b 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