Siemens Sentron Current transformer, 750A input/5A output

Product Overview

The Siemens 4NC5330-2CE21 is a SENTRON series bushing-type current transformer designed for measurement and monitoring in electrical distribution systems. It features a ratio of 750 A primary to 5 A secondary with an output of 5 VA and an accuracy class of 1.0. The unit supports window or bus-bar mounting up to a maximum conductor diameter and is suitable for integration into industrial switchgear and metering panels.

Key Features

• Bushing-type current transformer from the SENTRON 4NC product family
• Primary to secondary ratio: 750 : 5 A
• Rated apparent output of 5 VA, accuracy class 1.0
• Window or bus-bar pass-through design – supports conductor diameters up to 36 mm
• Screw-type terminals for secure secondary connections
• Compact dimensions enabling integration in panel or switchgear installations

Technical Specifications

• Article Number: 4NC5330-2CE21
• Product Family: SENTRON 4NC bushing-type current transformers
• Primary Current (In): 750 A
• Secondary Current (I₂): 5 A
• Rated Apparent Output: 5 VA
• Accuracy Class: 1.0
• Max Conductor Diameter: 36 mm
• Dimensions (W×H×D): approx. 82.5 mm × 98 mm × 77 mm
• Ambient Operating Temperature: –30 °C to +55 °C
• Protection Class: IP20

Compliance & Certifications

• Manufactured by Siemens in conformance with IEC/EN standards for current transformers
• Designed for integration in industrial measurement systems and certified for metering and monitoring applications

Applications

Ideal for installation in low-voltage switchgear, electrical distribution panels, or power-monitoring systems requiring accurate current measurement from bus-bar or conductor inputs of up to 750 A. Commonly used in industrial plants, infrastructure projects and commercial installations for metering, protection and energy-management tasks.