SIEMENS 7NG3136-1AB11-Z CT | Core Balance, 1000:1, 0.5 VA, 5P10, for Earth Fault Protection

SIEMENS 7NG3136-1AB11-Z CT | Core Balance, 1000:1, 0.5 VA, 5P10, for Earth Fault Protection

SIEMENS 7NG3136-1AB11-Z transformer specifications. Core balance current transformer, ratio 1000:1, 0.5 VA, 5P10, for earth leakage detection.

Product Overview

The SIEMENS 7NG3136-1AB11-Z is a core balance current transformer (also known as a toroidal or zero-sequence current transformer) designed for earth fault protection. It measures the vector sum of currents in all phase conductors. Under normal conditions, this sum is zero; an earth fault creates an imbalance, inducing a secondary current. This model has a transformation ratio of 1000:1, is rated 0.5 VA, and meets accuracy class 5P10 for protection applications.

Technical Specifications (Electrical)

Technical Specifications (Mechanical/Application)

Key Features

• Core Balance Design:​ Specifically for detecting earth leakage currents

• High Accuracy Class (5P10):​ Suitable for protection relays, ensuring accuracy up to 10 times rated current

• Low Burden (0.5 VA):​ Minimizes load on the connected protection device

• Robust Construction:​ For reliable operation in electrical switchgear

• Standard 1A Secondary:​ Compatible with most protection relays

• Essential for Safety:​ Key component in earth fault and residual current protection schemes

Applications

• Earth fault protection in low-voltage (LV) and medium-voltage (MV) distribution systems

• Connection to protection relays (e.g., Siemens 7SJ, 7UT series) for residual current monitoring

• Enhancing electrical safety in switchboards, motor control centers (MCCs), and generators

• Systems requiring sensitive detection of insulation faults to ground