The Ring Type CT – B7-320056OA110S2 Current Transformer is a high-capacity, precision-engineered device designed for accurate current measurement and reliable protection in heavy-duty industrial and commercial power systems. Manufactured using advanced magnetic core technology and high-quality insulation materials, this CT ensures excellent accuracy, durability, and long-term performance even under extreme operating conditions.
As part of the rugged and reliable B7 series, this model is specifically developed for large busbar and high-capacity cable applications, featuring a 320 mm inner diameter. Its ring-type (window type) construction enables easy installation without disconnecting the primary conductor, significantly reducing installation time and improving operational efficiency.
The B7-320056OA110S2 efficiently transforms high primary current into a standardized secondary current output (typically 5A or 1A), ensuring safe compatibility with energy meters, ammeters, and protection relays. Designed with high accuracy and minimal phase displacement, this current transformer provides precise measurements for energy monitoring, billing, and system protection.
The transformer is built with a high permeability silicon steel core, minimizing energy losses and ensuring stable performance across a wide range of operating conditions. The outer enclosure is constructed from flame-retardant thermoplastic, offering superior resistance to heat, dust, and mechanical stress, making it ideal for harsh industrial environments.
Compliant with IS / IEC 61869-2 standards, this CT guarantees safety, reliability, and consistent performance. It is widely used by electrical engineers, OEMs, and panel builders for efficient current monitoring in high-capacity electrical systems.
Model Number: B7-320056OA110S2
Product Type: Ring Type Current Transformer
Rated Primary Current: 320A (typical, configurable)
Secondary Current: 5A / 1A
Accuracy Class: Class 1.0 / Class 0.5
Rated Burden: 10 VA / 15 VA
Frequency: 50/60 Hz
System Voltage: Up to 0.72 kV
Insulation Class: Class E / B
Short-Time Thermal Current (Ith): 20 × In for 1 second
Dynamic Current (Idyn): 2.5 × Ith
Core Material: High-grade silicon steel
Mounting Type: Busbar / Cable (Ring Type)
Inner Diameter (ID): 320 mm
Operating Temperature Range: -10°C to +55°C
Storage Temperature Range: -20°C to +70°C
Housing Material: Flame-retardant thermoplastic
Standards Compliance: IS / IEC 61869-2
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