The MCT50-21(30) - A3-012555EA110S2 Current Transformer (CT) is a compact and high-precision device engineered for accurate current measurement and reliable protection in modern electrical distribution systems. Designed with advanced magnetic core technology and high-quality insulation materials, this CT delivers stable performance, minimal energy loss, and long operational life across industrial and commercial applications.
Part of the trusted MCT50 series, this model is specifically developed for panel mounting and cable-based installations, featuring a 21 mm window size. Its compact design makes it an ideal solution for switchgear panels, control panels, and distribution boards where space optimization is essential.
The A3-012555EA110S2 variant is engineered to provide high measurement accuracy with minimal phase displacement, ensuring precise readings for energy monitoring, billing, and protection systems. It converts high primary current into a standardized secondary output (typically 5A or 1A), ensuring compatibility with energy meters, ammeters, and protection relays.
Constructed using a high permeability silicon steel core, this current transformer ensures excellent linearity while minimizing hysteresis and eddy current losses across varying load conditions. The outer housing is made from flame-retardant thermoplastic, offering strong resistance against heat, dust, and mechanical stress, ensuring durability in demanding environments.
Designed in compliance with IS / IEC 61869-2 standards, this CT guarantees safety, reliability, and consistent long-term performance. It is widely used by panel manufacturers, OEMs, and electrical professionals in power distribution systems, industrial automation, and energy management applications.
Model Number: MCT50-21(30) - A3-012555EA110S2
Product Type: Current Transformer (CT)
Rated Primary Current: 120A
Secondary Current: 5A
Accuracy Class: Class 1.0 (Class 0.5 optional)
Rated Burden: 5 VA / 10 VA
Frequency: 50/60 Hz
System Voltage: Up to 0.72 kV
Insulation Class: Class E / B
Short-Time Thermal Current (Ith): 20 × In (1 sec)
Dynamic Current (Idyn): 2.5 × Ith
Core Material: High permeability silicon steel
Mounting Type: Panel / Cable Mount
Window Size: 21 mm
Operating Temperature: -10°C to +55°C
Storage Temperature: -20°C to +70°C
Housing Material: Flame-retardant thermoplastic
Standards Compliance: IS / IEC 61869-2
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