CTs and Rogowski coils for energy meters

Current sensors: CTs and Rogowski coils

Current transformers and Rogowski probes to pair with Chronos energy meters. Split-core to install without disconnecting cables, ring-type for new switchboards, flexible for the highest currents.

5 A secondary1 A333 mVRogowski 50–100 mV/kA

QualityAccuracy verified with our calibrators and test equipment.

AvailabilityWide range available from stock.

FlexibilityNon-stock codes available within reasonable lead times.

Split-core CTs

KCT series

They open and close around the cable: ideal for retrofits without shutting down the installation. 16, 24 and 36 mm apertures, 333 mV or 5 A output, 2.5 m twisted cable already connected.

Rated current: 100 · 200 · 400 A
Output: 333 mV (class 0.5) · 5 A (class 1)
Frequency: 50 Hz – 2 kHz
Measuring range: 10% – 120% In
Phase error: ≤ ±60 min
Temperature: −25 … +75 °C, humidity ≤ 85%
Housing: PA, UL94-V0
Standards: IEC 61869-2, EN 60044-1

Dimensional drawings KCT-16 and KCT-24

Ring-type CTs · closed core

CP series

The classic CT for new switchboards: 30 mm aperture, DIN-rail or panel mounting, screw terminal connection.

Rated current: 100 · 200 A
Output: 5 A, class 0.5
Burden: 2.5 VA (cl. 0.5) · 2.5–5 VA (cl. 1)
Frequency: 50 – 60 Hz
Measuring range: 5% – 120% In
Temperature: −25 … +75 °C, humidity ≤ 85%
Housing: PC, UL94-V0
Standards: IEC 61869-2, EN 60044-1

CP-62/30 dimensional drawing

Split-core CTs · rectangular window

HK series

Split-core with a rectangular window for large cables and busbars: 25 × 36.5 mm (HK-23) and 52 × 80 mm (HK-58).

Rated current: 100 · 200 · 300 · 600 A
Output: 5 A, class 0.5 (100 A: class 1)
Frequency: 50 – 400 Hz
Measuring range: 10% – 130% In
Phase error: ≤ ±30 min
Temperature: −25 … +75 °C, humidity ≤ 85%
Housing: PC, UL94-V0

HK-23 dimensional drawing

Rogowski coils · flexible

FRC series

Flexible loop that closes around even large cables and busbars: for very high currents and hard-to-reach points. Fully shielded, with high noise rejection.

Loop length: 350 mm (100 mm window) · 420 mm (120 mm window)
Sensitivity: 100 mV/kA · 85 mV/kA · 50 mV/kA a 50 Hz
Range: up to 2000 A (100 mV/kA) · 2350 A (85 mV/kA) · 4000 A (50 mV/kA)
Accuracy class: 1%
Linearity: ±0,2%
Position error: < 0.2% centred · < 1% at the side
Loop / cable: Ø 8 mm · 2 m cable
Temperature: −30 … +80 °C
Insulation: 1000 V CAT III, 600 V CAT IV
Standards: EN 61010-1, EN 61326-1

FRC dimensional drawing

Split-core Hall-effect sensor · AC and DC

D-C2T series

Split-core, measures DC and AC currents up to ±100 A with a response time under 7 µs: variable-speed drives, welders, batteries, UPS, electrochemistry.

Rated current: ±100 A (max 150 A peak), 21 mm aperture
Output: 5 V ± 2 V
Power supply: +24 V, < 25 mA
Accuracy: 1% FS, drift ±1 mV/°C
Insulation: 2.5 kV at 50 Hz for 1 min
Temperature: −40 … +85 °C
Connection: pluggable terminal 1.5 mm²
Note: not compatible with EMT meters

D-C2T dimensional drawing

Current sensors: CTs and Rogowski coils

The right sensor depends on the EMT input.

CTs with current secondary

Voltage-output CTs and Rogowski coils

Hall-effect sensor

Five sensor families.

KCT series

CP series

HK series

FRC series

D-C2T series

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