Siemens Sentron Current transformer, 250:5A, 5vA Part number 4NC5123-2CE21

Product Overview

The Siemens 4NC5123-2CE21 is a SENTRON current transformer designed for accurate current measurement and monitoring in low-voltage power distribution systems. It features a primary-to-secondary current ratio of 250:5 A with a rated output of 5 VA, providing precise measurement performance for energy management, metering, and protective relay applications. Compact and reliable, it is suitable for DIN rail or panel mounting within industrial and commercial installations.

Key Features

• Current transformer for SENTRON low-voltage systems
• Primary-to-secondary current ratio: 250 A / 5 A
• Rated apparent power: 5 VA
• High measurement accuracy for protection and metering applications
• Designed for safe and easy installation on busbars or DIN rails
• Durable housing with reliable insulation for demanding environments
• Compact design for efficient use of space in switchboards and panels

Technical Specifications

• Product Series: SENTRON Current Transformers
• Article Number: 4NC5123-2CE21
• Primary Current: 250 A
• Secondary Current: 5 A
• Rated Output: 5 VA
• Accuracy Class: Class 1
• Rated Frequency: 50 / 60 Hz
• Mounting Type: DIN rail or busbar mount
• Housing Material: Self-extinguishing thermoplastic
• Protection Class: IP20 (with terminals covered)
• Net Weight: Approx. 0.24 kg

Compliance & Certifications

• Complies with IEC 61869-2 and EN 61869-2 standards for current transformers
• Manufactured according to Siemens SENTRON quality and safety requirements
• RoHS-compliant and halogen-free materials

Applications

The Siemens 4NC5123-2CE21 is ideal for use in low-voltage switchboards, control panels, and energy distribution systems. It is designed for accurate current measurement, load monitoring, and protective relay input in industrial, commercial, and infrastructure environments. Its compact size, reliable performance, and robust construction make it suitable for integration in modern electrical energy management systems.