Product Overview
The SCT40L CT sensor is engineered to measure AC current in power systems, converting high primary current into a small, safe secondary current (10mA or 20mA) to feed into energy meters or monitoring instruments. The split-core design allows installation without disconnecting the conductor, reducing downtime and risk.
Because of its design and output, it is compatible with many metering and power monitoring devices that accept 10mA or 20mA CT inputs. The robust materials and insulation ensure stability and reliability in industrial environments.
| Model Description | ||||
| Model | Aperture | Input Current | Output Current | Accuracy |
| SCT40L-5k-50 | 40mm | 50A | 10mA | 1 |
| SCT40L-5k-100 | 40mm | 100A | 20mA | 0.5 |
| SCT40L-5k-200 | 40mm | 200A | 40mA | 0.5 |
| SCT40L-5k-300 | 40mm | 300A | 60mA | 0.5 |
| SCT40L-5k-400 | 40mm | 400A | 80mA | 0.5 |
| Electrical performance parameters | ||||
| Name | Measurement side | Measured value | Test Conditions | Standard test equipment |
| Rated input current | Punched core | 0~400A | 25℃ | Calibration instrument of ct, |
| Rated output current | Blue cable and | 0~80mA | Precision current transformer, | |
| White cable | Current voltage generator, | |||
| Working frequency | 50/60Hz | Resistance box, | ||
| Accuracy | Blue cable and | Class1/ Class0.5 | Digital multimeter, | |
| Angle difference | White cable | ≤90′ | Power frequency withstand | |
| Load Resistance | ≤30Ω | voltage tester | ||
| Pressure resistance | P-S | 3kVac | 1mA,1min | |
| Insulation resistance | P-S | ≥100Mohm | Rated voltage 500Vdc | |
| Turns ratio | N1:N2=1:5000 | |||
| Enameled wire grade | CLASS F（155℃） | |||
| Working temperature | -40℃~+50℃ | |||
| Secondary output | UL2468 24AWG blue and white cable, length 1m | |||
Key Features & Benefits
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Split-Core Design — Enables installation without interrupting circuits
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Multiple Ratio Options — e.g., 50A to 10mA, 100A to 20mA (or similar)
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High Accuracy & Linearity — Low error across the operating range
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Compact & Durable Build — Robust insulation, flame-retardant housing, stable under vibration
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Wide Operating Conditions — Suitable temperature and humidity tolerances for industrial settings
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Good Saturation Margin — Designed to avoid saturation under overcurrent or transient conditions
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Easy Compatibility — Works with CT-input energy meters, protection systems, monitoring devices
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Cost-effective Retrofitting — Ideal for upgrading existing installations without rewiring
Product Details
Applications
The SCT40L split-core CT is ideally used for:
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Energy meters and power monitoring systems that accept 10mA / 20mA CT inputs
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Retrofitting existing installations (no disconnection required)
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Industrial automation systems and control panels
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Renewable energy systems (solar inverters, DC/AC hybrid setups)
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Sub-metering in commercial buildings
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Load analysis, power quality modules, and metering expansions
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Integration into SCADA/BMS/EMS systems
Why Choose YADA SCT40L?
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Easy Installation — Split-core mechanism avoids the need to break the circuit
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Flexible Output Ratios — Supports common CT secondary current standards
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Stable & Accurate — Low drift, good linearity, reliable performance in field use
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Industrial Grade Construction — High insulation, vibration-resistant, durable
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Wide Environmental Capability — Works under wide temperature and humidity ranges
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Compatibility with B2B Systems — Designed for integration with meters, controllers, and monitoring systems
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Cost-Effective & Scalable — Ideal for projects where adding CTs without rewiring is valuable
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Support & Warranty — Backed by manufacturer reliability and after-sales support
FAQ
Q: What does “50A → 10mA / 100A → 20mA” mean?
A: It indicates the primary-to-secondary current ratio: for example, when 50A flows through the primary conductor, the CT outputs 10mA; similarly, at 100A, it outputs 20mA.
Q: Can this CT be installed without shutting down the circuit?
A: Yes. The split-core design allows you to clamp it around a live conductor without disconnecting wires.
Q: What accuracy class does it belong to?
A: That depends on the variant (e.g., 0.5, 1.0). Please confirm from the datasheet or model specification.
Q: What is the acceptable ambient temperature range?
A: Typically –20 °C to +60 °C (or per spec) — verify against your actual product sheet.
Q: What is the output burden (load) this CT can drive?
A: The rated burden (e.g., ≤2 VA) defines the maximum load the CT can drive without losing accuracy — please refer to the specific variant spec.