Type B Residual Current Transformer (RCT) Series – High-Precision AC/DC Leakage Current Sensors

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Industrial-grade Type B Residual Current Transformers (RCT) designed for EV charging stations, solar inverters, and industrial power supplies. Delivers high-precision detection of smooth DC, pulsating DC, and AC residual currents.

공유 대상:

제품 개요

그리고 Type B Residual Current Transformer (RCT) Series is an advanced leakage current detection solution engineered for modern EV charging infrastructure, solar PV systems, and industrial power electronics. By passing multiple primary power lines through a single ultra-high-permeability magnetic core, the RCT continuously measures the vector sum of currents to identify hazardous residual/leakage currents.

Built with a high-density primary winding structure capable of carrying heavy continuous AC loads, Trafopsu RCTs provide exceptional linearity, ultra-low phase error, and rapid tripping signal generation. They offer comprehensive protection against sinusoidal AC, high-frequency AC, pulsating DC, and smooth continuous DC residual currents—meeting stringent global safety standards such as IEC 62955, IEC 62752, 및 IEC 62020.

주요 기능

Type B Residual Current Detection: Optimized for sensing smooth DC leakage currents alongside AC and pulsating DC faults.
Integrated Dual Heavy-Current Primary Winding: Embedded multi-terminal primary connections designed to handle continuous operating currents reliably.
High-Precision Magnetic Core: Features ultra-low phase offset (down to 1.5°) and precise current transformation for accurate threshold tripping.
Robust Insulation & Isolation: Standardized 2500V / 3000V Dielectric Strength (Hi-Pot) between primary and secondary windings for enhanced user safety.
Industrial Thermal Endurance: Operating temperature rated from -40°C up to +105°C, ensuring long-term reliability in outdoor EVSE wallboxes and harsh environments.
UL 94-V0 Flame Retardant: Encapsulated in high-grade potting resin and flame-retardant bobbin materials.

Standard Model Comparison & Specifications

매개변수	O-26094-1	O-26094-2	O-26094-3
변환비	1:90 15:45	1:42 15：45	1:1:42
Primary Pin Terminals	P1-P2 / P3-P4	P1-P2 / P3-P4	P1-P2 / P3-P4
Secondary Pins	Pin 1 – Pin 2	Pin 1 – Pin 2	Pin 1 – Pin 2
Primary DCR ( $R_p$ )	0.85 mΩ Max.	0.85 mΩ Max.	0.85 mΩ Max.
Secondary DCR ( $R_s$ )	25.0 Ω Max.	22.0 Ω Max.	25.0 Ω Max.
Secondary Inductance	2.8 H Min. (@1kHz, 0.3V)	2.5 H Min. (@1kHz, 0.3V)	2.8 H Min. (@1kHz, 0.3V)
Hi-Pot Isolation	3000Vac / 50Hz / 3mA / 60s	2500Vac / 50Hz / 3mA / 60s	3000Vac / 50Hz / 3mA / 60s
Phase Error	1.5° Max.	N/A	N/A
Operating Temp.	-40°C to +105°C	-40°C to +105°C	-40°C to +105°C
Mounting Style	Through-Hole PCB Mount	Through-Hole PCB Mount	Through-Hole PCB Mount

애플리케이션

EV Charging Infrastructure (EVSE): Mode 3 AC Wallboxes and Mode 4 Fast DC Chargers requiring 6mA DC / 30mA AC residual current monitoring.
Solar Photovoltaic Inverters: Transformerless grid-tied PV inverters for DC isolation and ground-fault protection.
Industrial Inverters & Variable Frequency Drives (VFDs): Earth leakage monitoring in industrial motor drives.
Uninterruptible Power Supplies (UPS): Sensitive leakage current sensing in high-availability data center power systems.

Pinout & Schematics Diagram

Plaintext 
       Primary Lines (High Current)
       P1  o------- ( N1 ) -------o P2
       P3  o------- ( N2 ) -------o P4
                     ||
                     ||  Magnetic Core
                     ||
       Secondary   o------- ( N3 ) -------o  Secondary
        Pin 1                                 Pin 2

Primary Winding (N1 & N2): Integrated low-resistance heavy-copper conductors (DCR ≤ 0.85 mΩ).
Secondary Winding (N3): High-turn precise sensing coil (1000 Turns) for standard trip signal processing.

Customization & Engineering Support

Trafopsu offers customizable turns ratios (e.g., 1:1:1000, 1:1:1500, 1:1:2000), custom primary pin configurations, embedded DC sensing circuitry, and tailored enclosure footprints for OEM projects.