熱繼電器是利用電流的熱效應原理實現電機的過載保護的。

電動機在工作時，當負載過大、電壓過低或發生一相斷路故障時，電動機的電流都要增大，其值往往超過額定電流。如果超過不多，電路中熔斷器的熔體不會熔斷，但時間長了會影響電動機的壽命，甚至燒毀電動機，因此需要有過載保護。熱繼電器用于電動機的過載保護，它是利用電流熱效應使雙金屬片受熱后彎曲，通過聯動機構使觸點動作的自動電器。

ALLEN BRADLEY PanelView 1000 OPERATOR INTERFACE 2711-T10C8L1 SER D FRN 4.41

ALLEN BRADLEY IMC-121 64KW 1 AXIS SERVO ConTROLLER 1771-HS1 SER. A

ALLEN BRADLEY 9/SERIES REMOTE I/O MODULE 8520-RIOM1 160620 REV 01

ALLEN BRADLEY 9/SERIES REMOTE I/O MODULE 8520-RIOM1 160687 REV. 02

ALLEN BRADLEY ADJUSTABLE FREQUENCY AC DRIVE 1336-B015-EOE-FA2-L3 SER. A

ALLEN BRADLEY  PANELVIEW 1000 SER.C REV.C FRN4.48 2711-T10C15

ALLEN BRADLEY   COMBINATION STARTER  512-BJB-6-24 SERIES D

ALLEN BRADLEY  PANELVIEW 1000 SER.D REV.D FRN4.48 2711-T10C15X

ALLEN BRADLEY  PANEL VIEW 1000 RE-C SER-D FRN-4.41 TESTED 2711-T10C15

ALLEN BRADLEY 128K RESOURCE MANAGER DAUGHTER BOARD 5130-MRM1 SER. A

ALLEN BRADLEY  PANELVIEW 1000 SER.D REV.C FRN4.41 2711-T10C15

ALLEN BRADLEY  PANELVIEW 1000 SER-C REV-C FRN-4.46 2711-T10C15X

ALLEN BRADLEY NIPPonDENSO AC SERVO MOTOR 8500-A3D-K1A

ALLEN BRADLEY NIPPonDENSO AC SERVO MOTOR 8500-B1C-L1AN

ALLEN BRADLEY ANALOG OUTPUT MODULE 1771-0FE1 SER. B 

ALLEN BRADLEY AC SERVO MOTOR 1326AB-B530E-21-ML

ALLEN BRADLEY 45PVA-1LEB2-F4 SERIES A 12-24 VDC TRANSMITTER/RECEIVER, 

ALLEN BRADLEY 2 HAND ConTROL LOGIC UNIT, 24V AC/DC 44OR-D23021 SERIES A 

ALLEN BRADLEY 460V 5HP AC DRIVE 1336S-BRF50-AA-EN4-HAP-L5 SER. E IN BOX

ALLEN BRADLEY STARTER TYPE 12 ENCLOSURE SERIES D 512-BJB-6-24

ALLEN BRADLEY VersaView 1550M OPERATOR INTERFACE DISPLAY 6176M-15PN SER A REV. A

ALLEN BRADLEY   9/440 3-AXIS 5KW SYSTEM MODULE NO COVER  8520

ALLEN BRADLEY 3-AXIS SERVO AMPLIFIER 8520-AA12 SER. A

ALLEN BRADLEY 30HP ConSTANT TORQUE 3-PHASE AC DRIVE 1336-B030-EOF SER. A

ALLEN BRADLEY   NO COVER 1-AXIS  8520  1S5A-BAT-EX4-Y1-Y-4-5-7

ALLEN BRADLEY 3KW AC SERVO ConTROLLER AXIS MODULE 1394C-AM04 SER. C

ALLEN BRADLEY SMC PLUS 24A SMART MOTOR ConTROLLER 150-A24NBDD SER. B

ALLEN BRADLEY RELIANCE ELECTRIC AC SERVO MOTOR 1326AB-B720E-21-MK7L / 189731

ALLEN BRADLEY 278/420V 7.6/11KW AC MOTOR 8720SM-011S1DBS0A1 WORN PAINT

ALLEN BRADLEY 3 AXIS 10KW SYSTEM MODULE 8520-3S10A-BAT-EX4-T1-Y-4-5-7

ALLEN BRADLEY ConSTANT TORQUE 3-PHASE AC DRIVE 1336-B003-EOD-FA2-L3 SER. A

ALLEN BRADLEY 50HP VARIABLE SPEED AC DRIVE 1336S-B050-AN-EN4-L6 SER. D PLASTIC

ALLEN BRADLEY 1336 PLUS AC DRIVE 1336S-B010-AA-EN4-HA1-L6 SER. D FAN

ALLEN BRADLEY VersaView 1550M OPERATOR INTERFACE PANEL 6176M-15PT SER. A

ALLEN BRADLEY LogixPAC LOGIX 5555 PROCESSOR UNIT 1756-L55 SER. A 

ALLEN BRADLEY  ULTRA 3000 SERVODRIVE SER.B 9101-1929 / 2098-DSD-030-SE

ALLEN BRADLEY 2755-L4FbaseRIES B LASER SCANNER

ALLEN BRADLEY 1336 II DRIVE 1336F-BRF75-AA-EN

ALLEN BRADLEY 1336S-B025-AN-DE4 MISSING FACE PLATE

ALLEN BRADLEY   SYSTEM MODULE  8520-3S10A-BAT-EX4-T1-Y-4

ALLEN BRADLEY 128K ERROR CORRECTING RAM MEMORY 1775-MED SERIES B  IN BOX

ALLEN BRADLEY AC DRIVE 1336S-BRF75-AA-EN4-L5 SER. E

ALLEN BRADLEY COMBINATION STARTER W/ CIRCUIT BREAKER 513-BDB-6P-41 SER. E 

ALLEN BRADLEY 460VAC DC CONTROLLER, 1395-B74-C2-P12 SER. B

ALLEN BRADLEY 9/440 3-AXIS 10KW SYSTEM MODULE 8520-3S10A-BAT-EX4-Y-2-3-5-7

ALLEN BRADLEY 13KVA ADJUSTABLE FREQUENCY AC DRIVE 1336S-B010-AA-EN4-HAP-L6 SER D