The Ring Type CT – B7-300056OA110S2 Current Transformer is a high-capacity, precision-engineered electrical device designed for accurate current measurement and reliable protection in industrial and commercial power systems. Built using advanced magnetic core technology and premium insulation materials, this CT ensures consistent accuracy, durability, and long operational life even in demanding electrical environments.
As part of the robust and trusted B7 series, this model is specifically developed for large busbar and heavy cable applications, featuring a 300 mm inner diameter. The ring-type (window type) construction allows easy installation without disconnecting the primary conductor, significantly reducing installation time and minimizing operational downtime.
The B7-300056OA110S2 efficiently converts high primary current into a standardized secondary output (typically 5A or 1A), ensuring compatibility with energy meters, ammeters, and protection relays. Designed with high accuracy and minimal phase displacement, this current transformer delivers precise measurements essential for energy monitoring, billing, and protection systems.
Manufactured with a high permeability silicon steel core, the CT minimizes energy losses while maintaining excellent linearity across varying load conditions. Its outer enclosure is made from flame-retardant thermoplastic, providing strong resistance against heat, dust, and mechanical stress, ensuring durability in harsh industrial conditions.
Designed in compliance with IS / IEC 61869-2 standards, this current transformer guarantees safety, reliability, and long-term performance. It is widely used by panel manufacturers, OEMs, and electrical engineers in modern power distribution and automation systems.
Model Number: B7-300056OA110S2
Product Type: Ring Type Current Transformer
Rated Primary Current: 300A (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): 300 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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