动作原理：
感应型过电流继电器是利用电流互感器二次侧电流，在继电器内产生磁场，以促使圆盘转动，但流过的电流必须大于电流标置板的电流值才能转动。
2、过电压继电器
过电压继电器，简称OV，它的主要用途在于当系统的异常电压上升至120%额定值以上时，过电压继电器动作而使断路器跳脱保护电力设备免遭损坏，感应式过电压继电器的构造及动作原理和过电流继电器相似，只有主线圈不同。
3、欠电压继电器
欠电压继电器，简称UV，其构造与过电压继电器相同，所不同的是内部触头及当外加电压时转盘会立即转动。
4、接地过电压继电器
接地过电压继电器，简称OVG，或称接地报警继电器简称GR，其构造与过电压继电器相同，使用与三相三线非接地系统，接于开口三角形接地的接地互感器上，用以检知零相电压。GENERAL ELECTRIC DS3800DXRA1C1C 6BA04 SIGNAL RECEIVER CARD SERIES 6 DXRA 6DA03
REPAIRED UNICO 703-591 RACK 703591, 313-730, 0639-WWW8
NIB MSA 490892 ConTROL BOARD 5000 SERIES REV 2 FRONT
AMETEK DREXELBROOK 700-1202-021 PXTX SERIES SENSING ELEMENT PROBE 10-30VDC
ALLEN BRADLEY 140092 REV. 24 4202 BOARD SPARE PARTS KIT 140093, 133495-04
SERVO DYNAMICS SDBDTL925-34 BOARD PART NO. 7300-8074
EATON / OPCON 1410A-6501 PHOTOELECTRIC MODULE 115VAC 50/60HZ
KLOCKNER MOELLER PS306-DC
SEALED ALLEN BRADLEY 505-AOD
BURTON 513-385-000 FIRING , 413-064-000
GE FANUC IC693PCM300P PROGRAMMABLE
GENERAL ELECTRIC 193X252AAG02
P2CB485 CIRCUIT BOARD FG-PPM485-01-ST01 Rev A6 S/N NO. TS 06050032924
RELIANCE ELECTRIC 846656-R PC BOARD 0-48652, UCC1 W/ 0-52015
DAYTRonIC 4062 SERIES
SAMES GN4002 TYPE 3AG2A ConTROLLER 63-0650-00
REPAIRED ATLAS COPCO 4240031181 SERVO ConTROLLER QMS34015 4240031181-0008
KOLLMORGEN EB-202-B-91-001 BRUSHLESS MOTOR NO. SAB-425827 H.P. 1.3
FANUC A05B-2350-C100
FANUC A05B-2051-C121
FANUC A20B-1000-0770-01 POWER P85P00116
ROSEMOUNT 01984-1460-0003 I/O ConTACT CARD 0198414600003 REV. F/J
ABB XDA101BE61 PC
COGNEX 800-5749-1 REV. A VISION SENSOR IN-SIGHT 1010 CAMERA W/ COSMICAR
INCLUDES 206-6364-410 IN-SIGHT VERSION 4.1.0
ALLEN BRADLEY 1336S-MCB-SP1A MAIN REV. 09 2002
ALLEN BRADLEY 1336S-MCB-SP1
KEYENCE CORPORATION CA-MN80 PANEL LCD 8-1/2IN
CEE ITMF7721 MOTOR A/8530 IN:5A .60HZ
FOXBORO 132F-N4 INDICATING SUPPLY 20-22 PSIG
GT ELETTRonICA MAXCT1/010.040 REV. 1.0 ENCODER CARD MAXCT V 1.0 9CSABMMAX10-24
HEWLETT PACKARD 6106A DC POWER SUPPLY 0-100 0-.2A
LIGHTING ELIMINATORS SB22 120/208V 3 SANDWICH BLOCK PART NO. 0004503
OMRON B5N-2100-PC BOARD I/F 2314283-4B
LOGIC BEACH INC. MODULOGGER MINI DATA LOGGING SYSTEM W/ MLAD-1, MLIM-5, MLCPU-1
INVENSYS AC134000 PC BOARD REV. 1
GE FANUC IC320CGM500D
GE FANUC IC660EBD022X ELECTRIC
NIB GIDDINGS & LEWIS 503-15529-00
501-03798-00, 502-03027-00
NIB GIDDINGS & LEWIS 502-02820-02 DIGITIZING REFERENCE MODULE 501-03208-02
RonAN ENGINEERING X55-600-GP-1-SM TRANSDUCER X55-600-GP, 36VDC, 3-15PSIG
ConTROL TECHNOLOGY 901B-2550 ISOLATED ANALOG INPUT MODULE REV B.0
ConTROL TECHNOLOGY 901B-2550 ISOLATED ANALOG INPUT MODULE REV B.3
MITSUBISHI MELSEC AD71 PROGRAMMABLE AD71S1
RELIANCE ELECTRIC 84543-108A PC BOARD 107172-001Z , 0-48652
RELIANCE ELECTRIC 107172-001V BOARD 107172001V 84543-108A 0-48652
TEXAS INSTRUMENTS 500-5047-A ANALOG OUTPUT MODULE 5005047A, ASSY : 2491152-0002
HonEYWELL 621-0004