FICO SLC-40 40 mm Window Current Transformer – 400 A / 500 A / 600 A to 5 A Secondary | Compact SLC Series CT

The FICO SLC-40 is a compact, molded-housing current transformer (CT) from the SLC Series — engineered for precise current measurement, monitoring, and protection in residential, commercial and light-industrial electrical systems. It offers a reliable solution where moderate-to-high currents need to be stepped down safely for metering or protective relays, while maintaining easy installation and robust performance.

 Key Features & Benefits

• Primary current options: 400 A, 500 A, 600 A (to 5 A secondary) — With support for common load levels such as 400/5 A, 500/5 A and 600/5 A, the SLC-40 is versatile enough for many standard electrical circuits, distribution panels, and power systems. This makes it suitable for various applications including energy metering, load monitoring and circuit protection.
• 40 mm window size – compact & versatile design — The 40 mm aperture window provides sufficient clearance for busbars or cables while keeping the unit compact and easy to install. Its molded case design ensures that installation is simple even in tight enclosures or control panels — an advantage where space is limited.
• Standardized 5 A secondary output — The 5 A secondary output is the industry standard, which ensures compatibility with most energy meters, power analyzers, relay protection devices, and other current-monitoring equipment. This facilitates straightforward integration into existing electrical systems.
• Accurate and stable current measurement — As a measuring-type current transformer, SLC-40 reduces high primary currents to a safe, manageable secondary current, enabling accurate monitoring and billing, and supporting the safe operation of protective relays under both normal and fault conditions.
• Electrical isolation & safety — By using electromagnetic induction and magnetic-core transformer design, the CT provides galvanic isolation between high-current conductors and secondary monitoring circuits. This enhances safety for both equipment and personnel, while preserving measurement integrity.
• Ideal for metering, monitoring, and protection systems — Whether for energy billing, load tracking, motor monitoring, or overload protection, the SLC-40 fits a wide range of use-cases: from residential or light commercial distribution boards to smaller industrial installations or machinery control panels.
• Compact, low-maintenance & cost-effective — The molded design ensures durability and minimal maintenance, while the compact footprint makes it a cost-effective choice when upgrading existing panels or installing new systems with limited space.

 Typical Applications & Use Cases

• Energy metering and billing systems in residential or commercial buildings.
• Load monitoring and distribution panel metering in offices, shops, small factories or workshops.
• Integration with ammeters, power meters, smart meters or energy management systems.
• Protection relay input for overload/short-circuit protection in small to medium electrical circuits.
• Retrofitting or upgrading existing installations where busbar or cable clearance fits within 40 mm window.

 Why Choose the FICO SLC-40 CT?

For those needing a balanced solution between compact size, reliable performance, and modern electrical functionality, the FICO SLC-40 shines. It offers a good mix of:

• a practical primary current range (400A–600A),
• a standard secondary of 5A for easy integration,
• a compact and easy-to-install windowed design, and
• safe, accurate current conversion with galvanic isolation.

Whether you’re wiring a new commercial panel, upgrading an older system, or installing a monitoring setup for energy usage or protection — SLC-40 presents a dependable, easy-to-use CT that delivers steady performance without unnecessary complexity.