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Voltage Sensors · Isolated Hall Effect · Railway & Industrial

COSY-C Series

Isolated voltage sensing for railway, wind power conversion and demanding industrial systems.

The COSY-C family measures DC, AC, pulse and arbitrary voltage signals with galvanic isolation between primary and secondary circuits. Nine nominal voltage classes share one mechanical platform, making the family suitable for traction converters, renewable-energy conversion, industrial drives, UPS and other critical power systems.

50–2000 VNominal voltage range
Up to ±3000 VMeasuring range
8.5 kV ACDielectric strength
30 µsDelay time at 10%
±0.5%Typical accuracy
−40°C to +85°COperating temperature
ADISENS COSY-C isolated voltage sensor
Family overview

Eight published voltage classes on one common platform

COSY-C keeps the same mechanical envelope and connection philosophy across the family, simplifying design-in, qualification, sourcing and maintenance.

50 V±75 VStandard
125 V±188 VStandard
250 V±375 VStandard
500 V±750 VStandard
750 V±1200 VStandard
1000 V±1500 VStandard
1500 V±2250 VStandard
2000 V±3000 VStandard
References & Documents

COSY-C technical characteristics and datasheets

Click any reference or PDF link to open the corresponding technical datasheet.

Reference Nominal voltage Measuring range Secondary nominal current Sensitivity Supply Accuracy Linearity Delay / response Isolation Status Datasheet
COSY-C-50S3 PDF ↗ 50 V ±75 V 50 mA 1000 µA/V ±13.5 to ±26.4 V ±0.5% ±0.5% 30 / 50 µs 8.5 kV Standard Open PDF ↗
COSY-C-125S3 PDF ↗ 125 V ±188 V 50 mA 400 µA/V ±13.5 to ±26.4 V ±0.5% ±0.5% 30 / 50 µs 8.5 kV Standard Open PDF ↗
COSY-C-250S3 PDF ↗ 250 V ±375 V 50 mA 200 µA/V ±13.5 to ±26.4 V ±0.5% ±0.5% 30 / 50 µs 8.5 kV Standard Open PDF ↗
COSY-C-500S3 PDF ↗ 500 V ±750 V 50 mA 100 µA/V ±13.5 to ±26.4 V ±0.5% ±0.5% 30 / 50 µs 8.5 kV Standard Open PDF ↗
COSY-C-750S3 PDF ↗ 750 V ±1200 V 50 mA 66.53–66.80 µA/V ±12 / ±24 V ±0.7% ±0.5% 30 µs 8.5 kV Standard Open PDF ↗
COSY-C-1000S3 PDF ↗ 1000 V ±1500 V 50 mA 50 µA/V ±12 / ±24 V ±0.7% ±0.5% 30 µs 8.5 kV Standard Open PDF ↗
COSY-C-1500S3 PDF ↗ 1500 V ±2250 V 50 mA 33.33 µA/V ±13.5 to ±26.4 V ±0.5% ±0.5% 30 / 50 µs 8.5 kV Standard Open PDF ↗
COSY-C-2000S3 PDF ↗ 2000 V ±3000 V 50 mA 25 µA/V ±13.5 to ±26.4 V ±0.5% ±0.5% 30 / 50 µs 8.5 kV Standard Open PDF ↗
Custom COSY-C Need another nominal voltage, output or project-specific configuration?
Request a Custom Product →
Engineering performance

High isolation, stable accuracy and fast voltage feedback

8.5 kV AC

Dielectric strength at 50 Hz for 1 minute.

1000 MΩ

Typical insulation resistance.

60 mm

Creepage distance across the common platform.

43 mm

Clearance distance.

30 µs

Short delay suited to converter control and protection loops.

UL94-V0

Insulated plastic case material classification.

Railway standards & compliance

Designed for demanding rolling-stock and power-electronics environments

The controlled COSY-C documentation highlights a railway and electrical-safety standard set that is central to the positioning of the family.

EN 50155Rolling-stock electronic equipment
EN 50124-1Railway insulation coordination
EN 50121-3-2Railway EMC
EN 45545Fire protection
EN 61373Shock and vibration
EN 50178Electronic equipment for use in power installations
IEC 61010-1Electrical-safety and installation framework
CE / RoHS / REACHConformity and environmental information available from ADISENS
Measurement principle

Bi-directional isolated voltage measurement

The primary voltage is applied directly to the +HT and −HT terminals. An isolating amplifier converts it into an electrically isolated secondary current IS, proportional to the primary voltage. The current flows through an external measuring resistor RM to produce the measurement voltage VM.

1. Primary voltageApplied directly between +HT and −HT.
2. Isolated conversionConverted into proportional secondary current IS.
3. External RMTransforms IS into the measurement voltage VM.
4. Isolated supplyNo galvanic path between high-voltage circuit and control system.
Applications

Best-fit applications for COSY-C

Railway TractionPropulsion and auxiliary converters, onboard inverters and substations. Wind Power ConversionDC-link and converter voltage feedback in turbine and grid-side power conversion. Solar EnergyPV inverter and DC-link voltage measurement. Energy Storage / BESSBattery and bidirectional converter voltage monitoring. Industrial DrivesDC-bus monitoring, power-converter control and protection. UPS / SMPS / WeldingIsolated voltage feedback for high-power supply systems.
ADISENS COSY-C black and grey sensor variants
Mechanical platform

One architecture across the COSY-C range

The common mechanical platform is designed to simplify integration across different voltage classes.

Primary connection2 × M5 threaded studs
Secondary connection3 × M5 threaded studs or 6.3 × 0.8 mm terminal
Mounting2 × Ø6.5 mm slotted holes
Common envelopeShared mechanical architecture across the published range
Open Product Range Overview →
Selection support

Need help selecting a COSY-C reference?

Share your nominal voltage, transient range, converter architecture, railway requirements and output constraints with our technical team.

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Custom engineering

Need another voltage class or project-specific adaptation?

ADISENS can review intermediate voltage ratings, connection adaptations and application-specific requirements.

Request a Custom COSY-C →