WE-CST Current Sense Transformer
SizeDimen­sions3DL
(mm)
W
(mm)
H
(mm)
Mount
EE4.4
4.7 4.65 3.55 SMT
EE5
7.7 6.9 5.33 SMT
EE13/7/4
14.48 20.2 10.5 SMT

Characteristics

  • Learn more about current sense transformers
  • Compact and low profile
  • For SMD assembly
  • Frequency up to 1 MHz
  • Primary current rating to 40 A
  • Operating temperature: -40 °C to +130 °C

Applications

  • AC current detection
  • Switch mode power supply
  • Overload sensing
  • Load drop/shutdown detection
  • Metering
  • Load measurements
  • High frequency current sensing

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Products

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EE4.4
EE5
EE13/7/4
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Data­sheet
Downloads
Status
L(µH)
n
IR(A)
∫Udt(µVs)
VT(V (AC))
RDC 1(mΩ)
RDC 2(Ω)
Samples
WE-CST Current Sense Transformer
749252020
33 µH, 1:20, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance33 µH
Turns Ratio1:20 
Rated Current7 A
Voltage-µSecond9 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 20.35 Ω
WE-CST Current Sense Transformer
749252030
74 µH, 1:30, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance74 µH
Turns Ratio1:30 
Rated Current7 A
Voltage-µSecond13.5 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 20.8 Ω
WE-CST Current Sense Transformer
749251020
80 µH, 1:20, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance80 µH
Turns Ratio1:20 
Rated Current20 A
Voltage-µSecond10 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 20.2 Ω
WE-CST Current Sense Transformer
749252040
132 µH, 1:40, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance132 µH
Turns Ratio1:40 
Rated Current7 A
Voltage-µSecond18 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 21.6 Ω
WE-CST Current Sense Transformer
749251030
180 µH, 1:30, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance180 µH
Turns Ratio1:30 
Rated Current20 A
Voltage-µSecond15 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 20.48 Ω
WE-CST Current Sense Transformer
749252050
205 µH, 1:50, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance205 µH
Turns Ratio1:50 
Rated Current7 A
Voltage-µSecond22.5 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 22.5 Ω
WE-CST Current Sense Transformer
7492540020
224 µH, 1:20, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance224 µH
Turns Ratio1:20 
Rated Current40 A
Voltage-µSecond49 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.033 Ω
WE-CST Current Sense Transformer
749252060
295 µH, 1:60, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance295 µH
Turns Ratio1:60 
Rated Current7 A
Voltage-µSecond27 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 23.6 Ω
WE-CST Current Sense Transformer
749251040
320 µH, 1:40, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance320 µH
Turns Ratio1:40 
Rated Current20 A
Voltage-µSecond20 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 20.9 Ω
WE-CST Current Sense Transformer
749252070
400 µH, 1:70, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance400 µH
Turns Ratio1:70 
Rated Current7 A
Voltage-µSecond31.5 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 24.6 Ω
WE-CST Current Sense Transformer
749251050
500 µH, 1:50, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance500 µH
Turns Ratio1:50 
Rated Current20 A
Voltage-µSecond25 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 21.4 Ω
WE-CST Current Sense Transformer
7492540030
504 µH, 1:30, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance504 µH
Turns Ratio1:30 
Rated Current40 A
Voltage-µSecond74 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.093 Ω
WE-CST Current Sense Transformer
749251060
720 µH, 1:60, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance720 µH
Turns Ratio1:60 
Rated Current20 A
Voltage-µSecond30 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 21.75 Ω
WE-CST Current Sense Transformer
749252100
820 µH, 1:100, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance820 µH
Turns Ratio1:100 
Rated Current7 A
Voltage-µSecond45 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 29.5 Ω
WE-CST Current Sense Transformer
7492540040
896 µH, 1:40, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance896 µH
Turns Ratio1:40 
Rated Current40 A
Voltage-µSecond99 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.13 Ω
WE-CST Current Sense Transformer
749251070
980 µH, 1:70, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance980 µH
Turns Ratio1:70 
Rated Current20 A
Voltage-µSecond35 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 22.2 Ω
WE-CST Current Sense Transformer
749252125
1280 µH, 1:125, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance1280 µH
Turns Ratio1:125 
Rated Current7 A
Voltage-µSecond56.2 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 213 Ω
WE-CST Current Sense Transformer
7492540050
1400 µH, 1:50, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance1400 µH
Turns Ratio1:50 
Rated Current40 A
Voltage-µSecond124 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.202 Ω
WE-CST Current Sense Transformer
749252150
1800 µH, 1:150, 7 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance1800 µH
Turns Ratio1:150 
Rated Current7 A
Voltage-µSecond67.5 µVs
Insulation Test Voltage750 V (AC)
DC Resistance 13 mΩ
DC Resistance 221 Ω
WE-CST Current Sense Transformer
749251100
2000 µH, 1:100, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance2000 µH
Turns Ratio1:100 
Rated Current20 A
Voltage-µSecond50 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 25.5 Ω
WE-CST Current Sense Transformer
7492540060
2000 µH, 1:60, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance2000 µH
Turns Ratio1:60 
Rated Current40 A
Voltage-µSecond148 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.305 Ω
WE-CST Current Sense Transformer
7492540070
2740 µH, 1:70, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance2740 µH
Turns Ratio1:70 
Rated Current40 A
Voltage-µSecond173 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.367 Ω
WE-CST Current Sense Transformer
749251125
3000 µH, 1:125, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance3000 µH
Turns Ratio1:125 
Rated Current20 A
Voltage-µSecond68 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 26.5 Ω
WE-CST Current Sense Transformer
749251150
4500 µH, 1:150, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance4500 µH
Turns Ratio1:150 
Rated Current20 A
Voltage-µSecond75 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 29.5 Ω
WE-CST Current Sense Transformer
7492540100
5600 µH, 1:100, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance5600 µH
Turns Ratio1:100 
Rated Current40 A
Voltage-µSecond248 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 20.805 Ω
WE-CST Current Sense Transformer
749251200
8000 µH, 1:200, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance8000 µH
Turns Ratio1:200 
Rated Current20 A
Voltage-µSecond100 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 216.5 Ω
WE-CST Current Sense Transformer
749251250
12500 µH, 1:250, 20 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance12500 µH
Turns Ratio1:250 
Rated Current20 A
Voltage-µSecond125 µVs
Insulation Test Voltage500 V (AC)
DC Resistance 10.75 mΩ
DC Resistance 223.5 Ω
WE-CST Current Sense Transformer
7492540150
12600 µH, 1:150, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance12600 µH
Turns Ratio1:150 
Rated Current40 A
Voltage-µSecond372 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 21.9 Ω
WE-CST Current Sense Transformer
7492540200
22400 µH, 1:200, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance22400 µH
Turns Ratio1:200 
Rated Current40 A
Voltage-µSecond496 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 22.63 Ω
WE-CST Current Sense Transformer
7492540500
135000 µH, 1:500, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance135000 µH
Turns Ratio1:500 
Rated Current40 A
Voltage-µSecond1240 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 221.2 Ω
WE-CST Current Sense Transformer
7492540750
300000 µH, 1:750, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance300000 µH
Turns Ratio1:750 
Rated Current40 A
Voltage-µSecond1860 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 250.1 Ω
WE-CST Current Sense Transformer
7492541000
540000 µH, 1:1000, 40 A
Status Activei| Production is active. Expected lifetime: >10 years.
Inductance540000 µH
Turns Ratio1:1000 
Rated Current40 A
Voltage-µSecond2480 µVs
Insulation Test Voltage1500 V (AC)
DC Resistance 10.28 mΩ
DC Resistance 287.64 Ω

Videos

Würth Elektronik Webinar: Using Current Sense Transformers