Shelly CT 400A Split-Core Current Transformer for Pro 3EM-400 Energy Meter
The Shelly CT 400A is a professional-grade split-core current transformer designed specifically for use with the Shelly Pro 3EM-400 three-phase energy meter. This precision measurement device accurately scales large alternating currents up to 400 A down to small, standardized values for safe and accurate energy monitoring in residential, commercial, and industrial applications. With its innovative snap-on, screwless mounting system, installation is quick and hassle-free - no need to disconnect existing circuits.
Key Features
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400 A capacity: Measures alternating currents up to 400 A per phase with precision
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Split-core design: Opens easily to clamp around existing cables without disconnection
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Tool-free installation: Snap-on mounting system for fast, screwless setup
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High accuracy: Transformation ratio of 3000:1 for precise current measurement
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Safe operation: Dielectric strength of 3000 VAC (60 s) for reliable isolation
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Durable construction: Openable ferrite core with robust plastic housing
Professional Energy Monitoring Made Simple
Current transformers are essential for monitoring high-current circuits safely. The Shelly CT 400A provides a secondary current that is accurately proportional to the current flowing in its primary circuit, while presenting negligible load. The 35 mm internal diameter accommodates most standard cables, and the openable ferrite core means you can install it without interrupting power to your circuits - perfect for retrofit installations in existing electrical panels.
Wide Operating Range
Designed for demanding environments, the CT 400A operates reliably in temperatures from -10°C to 50°C and humidity levels up to 80% RH. Suitable for installations up to 2000 m altitude, this current transformer is built to professional standards for long-term accuracy and durability.
Seamless Compatibility
The CT 400A connects to your Shelly Pro 3EM-400 energy meter via a 2-pin MX3.0-2x1Y connector, ensuring secure and reliable data transmission. Each transformer includes a connection cable for straightforward installation. Use up to four CT 400A transformers with your Shelly Pro 3EM-400 to monitor all three phases plus neutral for complete energy visibility.
Applications
- Three-phase commercial and industrial energy monitoring
- Solar and wind energy production tracking
- Building management systems and submetering
- Electrical panel monitoring and load balancing
- Energy consumption analysis and optimization
What's in the Box
- 1 × Shelly CT 400A Split-Core Current Transformer
- Connection cable with MX3.0-2x1Y connector
- User documentation
Full Specifications
| Model |
CT 400A (Manufacturer model: CT315) |
| Type |
Split-core current transformer |
| Nominal Primary Current |
400 A |
| Nominal Secondary Current |
133.33 mA |
| Transformation Ratio |
3000:1 |
| Internal Diameter for Conductor |
Ø 35 mm |
| Dielectric Strength |
3000 VAC (60 s) |
| Core Type |
Openable ferrite |
| Operating Temperature |
-10°C to 50°C |
| Allowable Humidity |
0 – 80% RH |
| Maximum Altitude |
2000 m |
| Connector |
MX3.0-2x1Y, 2 pins |
| Dimensions (H × W × D) |
84 × 54 × 48 mm ±0.5 mm |
| Weight |
290 g ±1 g (with cable) |
| Color |
White |
| Compatibility |
Shelly Pro 3EM-400 |
| Warranty |
5 years (Shelly Pro series devices) |
Specifications are sourced from the manufacturer product page and may be updated.
