Circuit Sensors is a trusted name in precision current transformers (CTs), delivering the accuracy, safety, and reliability required for today’s solar energy, EV charging, and industrial monitoring systems. Built for performance and compatibility, Circuit Sensors models are engineered to be direct replacements for many popular current transformers already used in the field—making upgrades and replacements seamless.
Whether you are installing a new monitoring system or replacing aging CTs, Circuit Sensors products fit right in without requiring system redesign.
Why Choose Circuit Sensors?
When working with high-voltage or high-current systems, safety and accuracy are essential. Circuit Sensors CTs are designed to:
- Provide Complete Electrical Isolation – Safely measure current without a direct electrical connection to the primary circuit.
- Deliver High Accuracy & Linearity – Reliable, consistent readings across the full operating range.
- Simplify Installation – Slim and split-core designs make installation quick, even in tight spaces.
- Match or Exceed OEM Performance – Built as drop-in replacements for common industry-standard models.
Featured Circuit Sensors Products
1. CircuitFlow 200A → 66.6 mA Current Transformer
- Primary Rating: 200 A AC
- Secondary Output: 66.6 mA
- Applications: Large residential solar arrays, commercial solar inverters, EV charging systems, industrial machinery.
- Form Factor: Solid-core for permanent installations.
Direct Replacement For:
- APsystems – 200A Current Transformer (200A/66.6mA)
- Magnelab SCT-200-66.6mA
- Accuenergy AcuCT-H063-200:66mA
- Continental Control Systems ACT-066-200
This CT is ideal for stable, high-current monitoring where a 66.6 mA output is the system standard.
2. CircuitFlow 225A → 0.333 VAC Slim Current Sensor
- Primary Rating: 225 A AC
- Secondary Output: 0.333 VAC
- Applications: Solar combiner boxes, commercial subpanels, energy meters.
- Form Factor: Slim, split-core design for easy retrofit without disconnecting conductors.
Direct Replacement For:
- SolarEdge – 225A Clamp Style Current Transformer
- Magnelab SCT-0750-225
- Continental Control Systems ACT-0750-225
- Accuenergy AcuCT-F-225:0.333V
Its low-profile design makes it perfect for tight-panel spaces, while the split-core body allows for installation without downtime.
3. CircuitFlow 80A → 26.6 mA Current Transformer
- Primary Rating: 80 A AC
- Secondary Output: 26.6 mA
- Applications: Residential subcircuits, microinverter arrays, smaller-scale solar and EV systems.
- Form Factor: Compact design for installations with limited space.
Direct Replacement For:
- APsystems – 80A Current Transformer (80A/26.6mA)
- Magnelab SCT-0750-080
- Accuenergy AcuCT-H040-80:26.6mA
- Continental Control Systems ACT-026-80
Compact and precise, this CT is ideal for branch-circuit monitoring and small renewable energy projects.
Key Benefits for Installers and Engineers
- Drop-In Compatibility – Swap out old CTs without modifying your system.
- Reliable Performance – Precision manufacturing for consistent measurement accuracy.
- Space-Saving Designs – Slim and compact models fit even in the most crowded panels.
- Cost-Effective – High performance without the high OEM price.
For engineers, installers, and system designers looking for accurate, safe, and compatible current transformers, Circuit Sensors is the perfect choice. With models like the CircuitFlow 200A 66.6 mA, CircuitFlow 225A 0.333 V Slim, and CircuitFlow 80A 26.6 mA, you can maintain or upgrade your systems confidently—knowing you’re getting top-tier performance and direct OEM replacement capability.
Explore the full lineup at circuitsensors.com or shop these models directly at circuitsolar.com.