当短路时,大电流(一般10至12倍)产生的磁场克服反力弹簧,脱扣器拉动操作机构动作,开关瞬时跳闸。当过载时,电流变大,发热量加剧,双金属片变形到一定程度推动机构动作(电流越大,动作时间越短)。有电子型的,使用互感器采集各相电流大小,与设定值比较,当电流异常时微处理器发出信号,使电子脱扣器带动操作机构动作。主电路是给异步电动机提供调压调频电源的电力变换部分,变频器的主电路大体上可分为两类:电压型是将电压源的直流变换为交流的变频器,直流回路的滤波是电容。郑工1995 92 81761
YOKOGAWA 0-150% MOTOR LOAD CURRENT PANEL METER 254200HEPZW0001 NIB
YOKOGAWA 0-150% MOTOR LOAD METER YE/250-2/0-1MADC
YOKOGAWA 0-150% MOTOR LOAD PANEL METER YE/250200FAFA TYPE-250 NIB
YOKOGAWA 0-150% PANEL METER 254200FA
YOKOGAWA 0-150% PANEL METER 254200HEHE8JCY NIB
YOKOGAWA 0-150-PERCENT METER YE152111FAFA2LBP
Yokogawa 0-175 Tons 0-30 Feet Db16 Dc Ammeter (U16)
Yokogawa 0-1DCMA Ram Meter 01DCMA/0-2000 - No Box
YOKOGAWA 0-1MADC/0-15PLATEKV 01MADC015PLATEKV
YOKOGAWA 0-2 D-C AMMETER - PANEL MOUNT DEGREES 925312
YOKOGAWA 0-2 D-C AMMETER - PANEL MOUNT, Appears Un
Yokogawa 0-200 % Torque Meter Analog Panel Meter
YOKOGAWA 0-200 DC AMPERES GAUGE 251300DRDR7JLA 612233-11RE
YOKOGAWA 0-200% FULL LOAD INDICATOR
YOKOGAWA 0-2000 DC AMPERES GAUGE 251300DRDR7JLA
YOKOGAWA 0-25 DC AMPERES 612232-X
YOKOGAWA 0-25 DC AMPERES PANEL METER, 251324ECEC8JCM NIB
YOKOGAWA 0-250 D-C AMMETER - PANEL MOUNT DB40
YOKOGAWA 0-2500 D-C AMPERES PANEL METER
YOKOGAWA 0-28GPM AXF ADMAG FLOWMETER AXF015C-NNAL1L-AA12-2NB GUARANTEED!
Yokogawa 0-300 ammeter
YOKOGAWA 0-300 DC VOLTS INDICATOR 251300DRDR8JLA
YOKOGAWA 0-300 DC VOLTS PANEL METER 250-220-RXRX * IN BOX*
YOKOGAWA 0-300 PANEL METER 251400FAFA * OUT OF BOX*
YOKOGAWA 0-30AAC AC AMPERES GAUGE NIB 9516TH / YE/AB-40
YOKOGAWA 0-400 DC AMPERES GAUGE 251300DRDR7JLA
Yokogawa 0-4500 RPM Turbine Tachometer Part # 128C183AA-6 GE Navy Turbine
Yokogawa 0-5 Amps , 2.5", Panel Meter 40/70H
Yokogawa 0-5 Amps , 2.5", Panel Meter 40/70H
YOKOGAWA 0-50 DC PANEL METER PART # A292533600
YOKOGAWA 0-50 VDC 4 1/4" PANEL METER Type AB40 P/N 103011NTNT
Yokogawa 0-500 AC Amp Panel Meter Type 180 Edgewise Instrument
YOKOGAWA 0-500 DC PANEL METER PART # A292487600
YOKOGAWA 0-50DCMA DC MILLIAMPERES PANEL METER YE/250200HYHY NIB
YOKOGAWA 0-60 A-C AMPERES PANEL METERS M/YE/251440LSNL
YOKOGAWA 0-600 DC AMPERES GAUGE 251300DRDR7JLA
Yokogawa 0-600 vac Panel Meter 250-3 RR308