The Ring Type CT – B7-125056LA110S2 Current Transformer is a high-performance and precision-engineered device designed for accurate current measurement and reliable protection in industrial and commercial electrical systems. Built with advanced core technology and superior insulation materials, this CT ensures consistent accuracy, long service life, and dependable performance under varying load conditions.
This model is part of the widely trusted B7 series, known for its robust construction, high thermal stability, and excellent short-circuit withstand capability. Featuring a 125 mm inner diameter, this ring-type current transformer is ideal for busbar and large cable applications, making it suitable for high-capacity electrical panels, switchgear, and power distribution systems.
The ring-type (window type) design allows installation without disconnecting the primary conductor, significantly reducing installation time and operational downtime. The B7-125056LA110S2 efficiently converts high primary current into a standardized secondary current output (typically 5A or 1A), ensuring compatibility with energy meters, ammeters, and protection relays.
Engineered for high accuracy and minimal phase displacement, this CT ensures reliable measurements for energy billing, monitoring, and system protection. The use of a high permeability silicon steel core reduces losses and enhances performance stability across a wide operating range.
The outer enclosure is made from flame-retardant thermoplastic, offering excellent protection against heat, dust, and mechanical stress. Designed in compliance with IS / IEC 61869-2 standards, this current transformer meets industry requirements for safety, reliability, and performance.
Model Number: B7-125056LA110S2
Product Type: Ring Type Current Transformer
Rated Primary Current: 150A (typical, may vary as per configuration)
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 permeability silicon steel
Mounting Type: Busbar / Cable (Ring Type)
Inner Diameter (ID): 125 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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