Product categories – SCTxxxx current transformer

Breakdown of the type designation of the SCT current transformer

Product categories – SCTxxxx current transformer 1:
Designation key of the SCT current transformers

Coil current transformers

Product categories – SCTxxxx current transformer 2:
SCT0xxx

In order to guarantee the power transmission, current transformers need a correspondingly large measuring core volume with decreasing primary nominal currents. The dimensions of standard current transformers would quickly hit their limits on the basis of this physical principle. The SCT0xxx coil current transformers with electrical isolation are specially designed for these low primary nominal currents and are used in corresponding applications.

Coil current transformers

SCT0111

Accuracy class 1,
Primary current 0...1 A AC to 0...30 A AC,
Secondary current 1 A AC

SCT0121

Accuracy class 0.5,
Primary current 0...1 A AC to 0...30 A AC,
Secondary current 1 A AC

Mini ring-type current transformer

Product categories – SCTxxxx current transformer 3:
SCT1xxx

The SCT1111 mini ring-type current transformer can be positioned on a DIN rail by means of snap-on mounting and is thus suitable for measurements in very tight installation spaces, e.g. directly in the sub-distribution unit. Two current transformers are attached to the DIN rail, while the third current transformer is plugged into the fastened current transformers. The connection is realized via removable picoMAX® connectors, which enables pre-wiring.

Mini ring-type current transformer

SCT1111

Accuracy class 1,
Primary current 0...32 A AC to 0...64 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 7.6 mm (size 1)

Ring-type current transformer

Product categories – SCTxxxx current transformer 4:
SCT2xxx

The SCT2xxx series offers a large selection of ring-type current transformers for primary currents from 60 to 2500 A in six sizes and two accuracy classes. The innovative screwless connection technology for rigid and flexible conductors saves time – ferrules can be dispensed with here.

Ring-type current transformer

SCT2111

Accuracy class 1,
Primary current 0...60 A AC to 0...500 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 25.7 mm (size 1)

SCT2121

Accuracy class 0.5,
Primary current 0...125 A AC to 0...600 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 25.7 mm (size 1)

SCT2211

Accuracy class 1,
Primary current 0...600 A AC / 750 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 31.8 mm (size 2)

SCT2221

Accuracy class 0.5,
Primary current 0...600 A AC / 750 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 31.8 mm (size 2)

SCT2311

Accuracy class 1,
Primary current 0...800 A AC / 1000 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 43.7 mm (size 3)

SCT2321

Accuracy class 0.5,
Primary current 0...800 A AC / 1000 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 43.7 mm (size 3)

SCT2411

Accuracy class 1,
Primary current 0...1250 A AC / 1500 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 43.7 mm (size 4)

SCT2421

Accuracy class 0.5,
Primary current 0...1250 A AC / 1500 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 43.7 mm (size 4)

SCT2515

Accuracy class 1,
Primary current 0...2000 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 54.7 mm (size 5)

SCT2525

Accuracy class 0.5,
Primary current 0...2000 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 54.7 mm (size 5)

SCT2615

Accuracy class 1,
Primary current 0...2500 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 70 mm (size 6)

SCT2625

Accuracy class 0.5,
Primary current 0...2500 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 70 mm (size 6)

3-phase ring-type current transformers

Product categories – SCTxxxx current transformer 5:
SCT3xxx

The compact SCT3xxx 3-phase ring-type current transformers for direct mounting below commonly used power switches measure primary currents from 3 x 50 to 3 x 600 A, with secondary currents of 1 or 5 A. The SCT3xxx series is available throughout in accuracy class 1 and is supplemented by the SCT3121-0125 and SCT3121-0150 current transformers in accuracy class 0.5.

3-phase ring-type current transformers

SCT3111

Accuracy class 1,
Primary current 3 x 0...50 A AC to 3 x 0...150 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 13.5 mm (size 1)

SCT3121

Accuracy class 0.5,
Primary current 3 x 0...125 A AC / 3 x 0...150 A AC,
Secondary current 1 A,
Max. diameter round conductor 13.5 mm (size 1)

SCT3215

Accuracy class 1,
Primary current 3 x 0...100 A AC to 3 x 0...250 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 18 mm (size 2)

SCT3315

Accuracy class 1,
Primary current 3 x 0...250 A AC to 3 x 0...600 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 22 mm (size 3)

Ring-type current transformer for differential current measurement

Product categories – SCTxxxx current transformer 6:
SCT5xxx

The increasing prevalence of DC loads (e.g., LED lighting, DC motor drives, 48 V DC bus systems, etc.), distributed DC generation (e.g., PV systems, UPS, batteries, etc.), and high-frequency converters (e.g., SMPS, motor drives, etc.) in industrial environments makes it increasingly difficult to reliably measure insulation faults with conventional current transformers designed for AC 50/60 Hz with limited measurement bandwidth.

Differential current transformers of the SCT5xxx series can be used here. Monitoring residual currents with the SCT5xxx in real-time in a power system opens up the possibility of evaluating the condition of the electrical insulation based on the actual measured value, so that the long-term trend of the residual current value can be used for planning maintenance to detect significant deterioration of the insulation.

This means that residual current monitors (SCT5xxx) used in a condition-based monitoring scheme Industrie 4.0-Standards, can detect faults in a timely manner and increase the availability of power supplies or plants at a much lower cost than conventional, expensive, and time-consuming high-voltage insulation testing.

Ring-type current transformer for differential current measurement

SCT5564

Measuring ranges 400 mA / 2 A, type B / B+, transformer opening 70 mm

Split-core current transformers

Product categories – SCTxxxx current transformer 7:
SCT6xxx

The separable measuring system of the SCT6xxx split-core current transformers enables flexible retrofitting without disconnecting the primary conductor. Due to the minimal installation effort, they are suitable for use in places that are difficult to access or where space is limited. Four sizes are available. Accuracy class 3 is suitable for primary currents from 60 to 150 A, accuracy class 1 for 200 to 1000 A.

Split-core current transformers

SCT6101

Accuracy class 3,
Primary current 0...60 A AC to 0...150 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 18.5 mm (size 1)

SCT6311

Accuracy class 1,
Primary current 0...200 A AC / 0...250 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 18.5 mm (size 3)

SCT6321

Accuracy class 0.5,
Primary current 0...200 A AC / 0...250 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 18.5 mm (size 3)

SCT6411

Accuracy class 1,
Primary current 0...300 A AC to 0...500 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 27.9 mm (size 4)

SCT6421

Accuracy class 0.5,
Primary current 0...400 A AC / 0...500 A AC,
Secondary current 1 A AC,
Max. diameter round conductor 27.9 mm (size 4)

SCT6615

Accuracy class 1,
Primary current 0...600 A AC / 0...750 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 42.4 mm (size 6)

SCT6625

Accuracy class 0.5,
Primary current 0...600 A AC / 0...750 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 42.4 mm (size 6)

SCT6715

Accuracy class 1,
Primary current 0...800 A AC / 0...1000 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 2 x 42.4 mm (size 7)

SCT6725

Accuracy class 0.5,
Primary current 0...800 A AC / 0...1000 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 2 x 42.4 mm (size 7)

Busbar split-core current transformers

Product categories – SCTxxxx current transformer 8:
SCT71xx

Like the SCT6xxx series, the SCT7xxx busbar split-core current transformers for primary currents up to 5000 A can be retrofitted to existing systems with no great mounting effort. From 500 A, there is a choice between accuracy class 0.5 and 1 for each primary current. The SCT7105-0100 and SCT7105-200 current transformers support accuracy class 3.

Busbar split-core current transformers

SCT7105

Accuracy class 3,
Primary current 0...100 A AC / 0...200 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 20 mm (size 1)

SCT7115

Accuracy class 1,
Primary current 0...200 A AC / 0...450 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 20 mm (size 1)

SCT7125

Accuracy class 0.5,
Primary current 0...400 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 20 mm (size 1)

SCT7215

Accuracy class 1,
Primary current 0...500 A AC / 0...600 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 50 mm (size 2)

SCT7225

Accuracy class 0.5,
Primary current 0...500 A AC / 0...600 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 50 mm (size 2)

SCT7315

Accuracy class 1,
Primary current 0...750 A AC to 0...1500 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 80 mm (size 3)

SCT7325

Accuracy class 0.5,
Primary current 0...750 A AC to 0...1500 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 80 mm (size 3)

SCT7415

Accuracy class 1,
Primary current 0...1500 A AC to 0...5000 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 80 mm (size 4)

SCT7425

Accuracy class 0.5,
Primary current 0...1500 A AC to 0...5000 A AC,
Secondary current 5 A AC,
Max. diameter round conductor 80 mm (size 4)