Siemens Sentron Window current transformer, 200A input, 5A output Part number 4NC5122-2CE21

Product Overview

The Siemens 4NC5122-2CE21 is a bushing-type current transformer from the SENTRON 4NC series. It features a primary/secondary ratio of 200/5 A with a rated output of 5 VA and accuracy class 1. The compact form is designed for attachment via a push-through bus bar or conductor in circuit-monitoring applications.

Key Features

• Bushing-type current transformer suitable for panel or switchboard monitoring
• Primary rated current: 200 A; secondary rated current: 5 A
• Apparent rated power: 5 VA, accuracy class 1.0
• Touch protection and IP20 protection class ensuring safe mounting
• Screw-type terminals for secondary connection, compatible with push-through conductor up to 19 mm diameter
• Compact dimensions: approx. 75.3 × 60 × 66 mm, lateral width clearance ≈20 mm

Technical Specifications

• Product Series: SENTRON 4NC Current Transformers
• Article Number: 4NC5122-2CE21
• Primary Rated Current (In): 200 A
• Secondary Rated Current: 5 A
• Rated Apparent Power: 5 VA
• Accuracy Class: 1.0
• Protection Class: IP20
• Conductor Opening Diameter: up to 19 mm
• Ambient Operating Temperature: –30 °C to +55 °C
• Mounting Method: Screw fixing, with push-through bus bar or conductor clearance around 20 mm

Compliance & Certifications

• Manufactured by Siemens according to industrial power-distribution and monitoring standards
• Designed for use within low-voltage switchgear and monitoring systems per IEC/EN 61869 series (current transformers)

Applications

Ideal for electrical distribution systems, switchboards or panel-mount applications where current monitoring or measurement is required. Typically used in energy-management systems, protection relays or metering installations to supply a standard 5 A secondary current to downstream measurement devices.