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High-Temperature Low-Voltage Current Transformer YDBH0.66-II-G Series | 0.66 kV, Up to 7500 A/5 A or 2000 A/1 A | EN 61010 Certified

Compliant with EN 61010 and CE certification, the YDBH0.66-II-G Series current transformer is rated for 0.66 kV systems, supports primary currents up to 7500 A, and offers accuracy classes 0.2S / 0.5S / 1.0. Built for harsh environments (-40 °C ~ +150 °C, ≤ 4000 m altitude), it ensures safe and precise current measurement for power metering and monitoring applications.

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Product Overview

Designed for demanding low-voltage power distribution and energy monitoring applications, the YADA YDBH0.66-II-G series current transformers deliver high accuracy and reliability. Certified to EN 61010 (instrument and metering transformers) with CE mark, this CT family supports primary currents up to 7,500 A with secondary output 5 A (or up to 2,000 A/1 A variant), making it a versatile choice for power monitoring cabinets, smart power distribution units and industrial control panels. Key features include high-temperature tolerance (-40 °C to +150 °C), altitude rating up to 4,000 m and a compact aperture design ideal for three-phase arrangement in control panels.

Model Specification Rated Input Current Rated Output Current Dimension(mm)
W H D a e
YDBH0.66-30Ⅱ-G 100A~600A 5A / 1A 62 101 45 32 32
YDBH0.66-40Ⅱ-G 150A~1200A 78 106 41 42 32
YDBH0.66-50Ⅱ-G 150A~1500A 87 116 45 52 32
YDBH0.66-60Ⅱ-G 300A~2500A 102 128 45 62 32
YDBH0.66-60×50Ⅱ-G 300A~2500A 102 145 45 62 52
YDBH0.66-80Ⅱ-G 400A~3000A 117 122 45 82 32
YDBH0.66-80×50Ⅱ-G 400A~3000A 145 158 50 102 52
YDBH0.66-100Ⅱ-G 500A~4000A 145 128 45 102 32
YDBH0.66-100×50Ⅱ-G 500A~4000A 145 158 50 102 52
YDBH0.66-100×80Ⅱ-G 500A~4000A 152 193 55 102 82
YDBH0.66-120Ⅱ-G 800A~5000A 174 171 48 122 52
YDBH0.66-120×70Ⅱ-G 1000A~5000A 160 196 60 122 72
YDBH0.66-130Ⅱ-G 1000A~5000A 176 163 50 135 55
YDBH0.66-150Ⅱ-G 1000A~6000A 210 179 55 155 55
YDBH0.66-180Ⅱ-G 1500A~6000A 239 184 60 185 55
YDBH0.66-220Ⅱ-G 1500A~6300A 280 193 60 225 55
YDBH0.66-260Ⅱ-G 1500A~6300A 320 194 60 265 55
YDBH0.66-260×100Ⅱ-G 2000A~7500A 308 221 63 265 105

Key Features & Benefits

  • Wide Primary Current Range – Supports up to 7,500 A on primary with secondary 5 A, and up to 2,000 A/1 A variant for flexible engineering design.

  • Multiple Accuracy Classes Available – Class 0.2S, 0.5S, 0.2, 0.5, and 1.0 available; suitable for metering grade and monitoring grade functions.

  • Low-Voltage Rated (0.66 kV) – Designed for standard low-voltage distribution networks, simplifying panel integration and international deployment.

  • High Ambient Temperature & Altitude Capability – Rated for operating temp from –40 °C to +150 °C and for altitude ≤ 4,000 m, enabling use in harsh industrial and export environments.

  • Compact Aperture Options – Apertures of 23 mm, 31 mm and 45 mm available — enabling installation flexibility in restricted panel spaces.

  • International Certification – CE mark and compliant to EN 61010-1:2010 + A1:2019 standard, assuring global export suitability.

  • Customisable & Project-Ready – Manufacturer offers custom design (3 days) and samples in 7 days — ideal for B2B OEM, EPC, and project supply.

Technical Specifications

Parameter Specification
Model YDBH0.66-II-G Series
Rated Voltage 0.66 kV
Rated Frequency 50 Hz
Primary Current Up to 7,500 A (Secondary 5 A) / up to 2,000 A (Secondary 1 A)
Secondary Current Options 5 A or 1 A
Accuracy Classes 0.2S, 0.5S, 0.2, 0.5, 1.0
Operating Temperature -40 °C ~ +150 °C
Altitude ≤4,000 m above sea level
Aperture (Busbar/Conductor Size) 23 / 31 / 45 mm
Relative Humidity 10% ~ 95%
Winding Material Copper
Phase Single-phase design

Typical Application Scenarios

  • Energy monitoring and billing points in low-voltage distribution boards (e.g., factories, commercial buildings)

  • Current sensing for smart power cabinets, sub-distribution units or panel-mounted switchgear for industrial automation

  • Integration with power monitoring systems, PLCs, or smart grid monitoring devices requiring high-precision CTs

  • Export projects (EPC, OEM) where global certification and reliable performance across wide temperature & altitude conditions are required

  • Retrofit or new installations where a compact, high-accuracy CT with project-friendly customization options is valuable

Installation & Usage Guidelines

  • Ensure the CT is installed with correct polarity (H1/H2 on primary, X1/X2 on secondary) so downstream metering/monitoring devices read correctly

  • Match the CT ratio to the expected load current range; selecting a ratio significantly above the actual load may impair low‐current accuracy

  • The CT secondary circuit must not be left open when the primary is energized — always ensure a proper burden is connected to avoid high voltage risks

  • Verify installation location meets operating temperature and altitude ratings (-40 °C to +150 °C, ≤4,000 m)

  • Choose the correct aperture size (23/31/45 mm) based on conductor or busbar dimensions to simplify panel layout

  • For metering applications, ensure the burden (meter + wiring) is within rated load to maintain the specified accuracy class

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