Description
This product is the YAONAN-branded Circular Residual Current Transformer, a pivotal safety-critical component for low-voltage electrical protection systems.
Encased in flame-retardant insulating plastic (compliant with key electrical safety standards such as IEC 61557), its vivid red circular housing not only delivers robust electrical insulation and mechanical durability (resistant to impact and wear in enclosed electrical environments) but also stands out clearly for quick identification during equipment inspection and maintenance. The generously sized circular aperture at its core is engineered to accommodate a wide range of cable diameters, while the integrated mounting tabs (fitted with pre-drilled fixing holes) enable flexible, stable installation—whether secured via screws in electrical enclosures, panel-mounted in distribution cabinets, or integrated into compact wiring setups, adapting seamlessly to diverse layout needs of power systems. The built-in green screw terminal block further simplifies secure, low-resistance wiring for signal transmission, reducing connection errors during on-site deployment.
Operating on the principle of electromagnetic induction, this transformer continuously monitors the current balance between phase wires and neutral wires in the circuit: under normal, leakage-free operation, the vector sum of currents in these conductors cancels out to zero, so no induced signal is generated; however, once a residual (leakage) current occurs (e.g., due to aging insulation, accidental human contact with live parts, or faulty equipment), the unbalanced current will induce a proportional electrical signal in the transformer’s core. This signal is then sent to a matching residual current device (RCD), triggering a rapid power-off response (typically within milliseconds) to mitigate risks of electrical shocks, short circuits, or electrical fires.
It boasts high-sensitivity detection (capable of responding to small leakage currents as low as a few milliamps) and a wide operating temperature range (usually -25℃ to +70℃), ensuring reliable performance in both dry indoor spaces and slightly harsh enclosed electrical cabinets. Beyond industrial power distribution systems and building electrical panels, it is also widely used in residential distribution boxes, commercial lighting circuits, small-scale industrial equipment control loops, and safety circuits for high-power household appliances (e.g., electric water heaters, air conditioners), acting as a frontline safety barrier for diverse electrical setups.
