The MCT45-21(40) - A2-012555EA110S2 Current Transformer (CT) is a compact and high-precision electrical device engineered for accurate current measurement and dependable protection in modern power distribution systems. Designed using advanced magnetic core technology and high-quality insulation materials, this CT ensures consistent performance, enhanced safety, and long operational life across a wide range of industrial and commercial applications.
As part of the trusted MCT45 series, this model is specifically built for panel mounting and cable applications, featuring a 21 mm window size that is ideal for compact installations. Its space-saving design makes it perfect for use in switchgear panels, control panels, and distribution boards where efficient utilization of space is essential.
The A2-012555EA110S2 variant delivers excellent measurement accuracy with minimal phase displacement, ensuring precise current monitoring for energy metering, billing, and protection systems. It converts high primary current into a standardized secondary current (typically 5A or 1A), making it compatible with various measuring instruments such as ammeters, energy meters, and protection relays.
The CT is constructed with a high permeability silicon steel core, which minimizes losses and ensures stable operation under varying electrical loads. The outer housing is made from flame-retardant thermoplastic, offering excellent resistance to heat, dust, and mechanical stress, ensuring durability in demanding environments.
Compliant with IS / IEC 61869-2 standards, this current transformer meets industry requirements for accuracy, safety, and performance. It is widely used by electrical engineers, OEMs, and panel manufacturers for efficient current monitoring and protection in modern electrical systems.
Model Number: MCT45-21(40) - A2-012555EA110S2
Product Type: Current Transformer (CT)
Rated Primary Current: 125A
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 for 1 second
Dynamic Current (Idyn): 2.5 × Ith
Core Material: High-grade silicon steel
Mounting Type: Panel / Cable Mount
Window Size: 21 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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