The Ring Type CT – B7-250056OA110S2 Current Transformer is a high-capacity, precision-engineered device designed for accurate current measurement and reliable protection in industrial and commercial electrical systems. Manufactured using advanced magnetic core technology and premium insulation materials, this current transformer delivers consistent performance, excellent durability, and long operational life even in the most demanding environments.
Part of the robust and widely trusted B7 series, this model is specifically designed for heavy-duty busbar and large cable applications, featuring a 250 mm inner diameter. Its ring-type (window type) construction enables easy installation without disconnecting the primary conductor, significantly reducing installation time and operational downtime.
The B7-250056OA110S2 efficiently converts high primary current into a standardized secondary current output (typically 5A or 1A), ensuring compatibility with energy meters, ammeters, and protection relays. Designed with high accuracy and minimal phase displacement, this CT provides reliable measurements essential for energy billing, monitoring, and protection systems.
Constructed using a high permeability silicon steel core, the transformer minimizes energy losses while maintaining excellent linearity across a wide operating range. The outer housing is made from flame-retardant thermoplastic, providing superior 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, accuracy, and long-term reliability. It is widely used by panel builders, OEMs, and electrical engineers for efficient current monitoring in modern electrical infrastructure.
Model Number: B7-250056OA110S2
Product Type: Ring Type Current Transformer
Rated Primary Current: 250A (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): 250 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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