FICO RLC-125 125×50 mm High-Current Transformer (1200 A – 4000 A / 5 A Secondary) – Heavy-Duty RLC Series CT

The FICO RLC-125 is a heavy-duty current transformer (CT) from the trusted RLC Series — designed for precise current measurement, monitoring, and protection in demanding industrial, commercial, and energy-metering environments. With a large 125 × 50 mm window aperture and a wide primary current range, this CT is ideal for robust busbars, large conductors, and high-load distribution systems.

Key Features & Benefits

• Wide primary current range (1200 A to 4000 A) — The RLC-125 supports primary currents from 1200 A up to 4000 A, stepping down to a standard 5 A secondary output. This range makes it highly versatile for heavy-duty power systems and capable of accommodating substantial load requirements with room for future expansion.
• Large 125 × 50 mm window size — The generously sized window easily accommodates thick busbars or multiple cables, simplifying installation in switchgear, large distribution panels, or industrial electrical enclosures. This makes it especially suitable when standard CTs cannot fit due to conductor size.
• Reliable 5 A secondary output — Provides a stable, standardized secondary output current (5 A) for downstream metering, protection relays, or energy monitoring devices — ensuring compatibility with most current-monitoring and metering setups.
• Accurate & stable performance — Built according to the RLC Series specifications with accuracy classes suitable for metering and protection (common accuracy classes include 0.5, 0.5S, 1, 3 depending on application). This ensures reliable measurement and protection in both normal operation and under load.
• Solid insulation and safety standards — The CT is a dry-type transformer with air insulation; housing is made of flame-retardant, self-extinguishing polycarbonate (PC/UL94-V0). Rated for equipment voltage up to 0.72 kV AC, with insulation test voltage 3.0 kV for 1 minute.
• Broad frequency and environmental tolerance — Designed to operate at typical power frequencies (50–60 Hz). It tolerates standard industrial environmental conditions and humidity levels, making it suitable for a variety of indoor installations.
• Versatile applications — Ideal for current measurement, power and energy monitoring, relay protection, load profiling and monitoring of large electrical systems. Useful for electrical distribution boards, industrial motors, HVAC systems, large commercial buildings, data centers, factories, and other high-power installations.

 Typical Installation & Use Cases

• Installation on busbars or large cables where standard CTs cannot fit — thanks to the 125×50 mm window size.
• Use in industrial distribution panels, factories, large commercial buildings, data centers, or any facility with high current loads.
• Integration with energy meters, power analyzers, protective relays, and monitoring equipment, enabling accurate metering, load monitoring, and protective functions.
• Suitable for retrofit upgrades or new installations requiring high-current capacity and reliable measurement.

 Why Choose the FICO RLC-125?

If your electrical system demands high current capacity, large conductor sizes, and precise measurement or protection, the FICO RLC-125 CT stands out as a robust and future-proof solution. Its wide current range and large window aperture ensure flexibility and reliability — from heavy industrial use to large commercial power distribution. With trusted build quality, safety compliance, and compatibility with standard metering/protection devices, this CT is a dependable choice for professionals.