Siemens Current transformer, class 1, 250/5A Part number 4NC5223-2CE21

Product Overview

The Siemens 4NC5223-2CE21 is a bushing-type current transformer in the SENTRON 4NC series. It features a primary current rating of 250 A, a secondary output of 5 A, and an apparent power of 5 VA. With an accuracy class of 1.0, IP20 protection and a push-through conductor/opening design, this unit is engineered for compact low-voltage distribution panel integration.

Key Features

• Window-type (bushing) current transformer for panel or switchboard installations
• Ratio: 250 A primary / 5 A secondary
• Rated apparent power: 5 VA
• Accuracy class 1.0 for measurement or monitoring purposes
• Push-through opening for conductor up to Ø 28 mm; fits a single busbar up to 30×10 mm or two busbars of 25×5 mm
• Screw-type terminals for the secondary winding for reliable connection
• Compact design with dimensions approx. height 78.5 mm × width 60 mm × depth 65 mm

Technical Specifications

• Product Series: SENTRON 4NC
• Article Number: 4NC5223-2CE21
• Rated Primary Current (In): 250 A
• Rated Secondary Current: 5 A
• Rated Apparent Power (S): 5 VA
• Accuracy Class: 1.0
• Insulation Voltage (Ui): 3 kV
• Operating Frequency: 50/60 Hz
• Ambient Operating Temperature: –30 °C to +55 °C
• Protection Class (Front): IP20
• Mounting Method: Screw fixing with push-through bar opening

Compliance & Certifications

• Designed and manufactured by Siemens in its SENTRON low-voltage distribution product range
• Conforms to IEC/EN standards for current transformers (IEC 61869 series) and measurement accuracy class 1.0

Applications

Ideal for use in switchboards, power distribution panels and energy-monitoring systems where accurate current measurement or monitoring is required. The 4NC5223-2CE21 is commonly used for feeding standard 5 A secondary current to measurement devices, protection relays or meters in compact installations.