Selectivity of Protection in Electrical Installations: NH Fuse-Link vs. Miniature Circuit Breaker

The selectivity of protective devices is a crucial consideration when designing low-voltage installations. The goal of selectivity is to minimize the consequences of a fault. Only the faulty part of the installation should be disconnected, while the rest remains operational. Selectivity is achieved if the fault is cleared by the protective device closest to the fault without triggering other protective devices.

Fuse Protection for Battery Storage and UPS Systems: A Technical Guide

Modern energy systems—combining battery storage, rectifiers, inverters, and bypass circuits—are at the heart of the global transition to sustainable, reliable power. In this blog, we explore where and why these systems are used, their key advantages, and the critical role of gS and gBat fuses. We’ll also compare these advanced fuse types with other options, providing technical insights for electrical engineers.

ETIBREAK NBS Upgrade: Adding a Shunt Trip Function

Adding a shunt trip to your ETIBREAK NBS moulded case circuit breakers (MCCBs) provides remote shutdown capability — crucial for improving safety and automation. This guide outlines the full installation process, from prep to testing. Whether you're upgrading an existing panel or setting up a new system, proper installation ensures reliable performance and seamless integration with your control setup. Let’s walk through each step to get it done right.

Installing Motor Operator on the ETIBREAK NBS MCCBs

In this blog, we’ll walk you through the installation and basic operation of the motor operator for ETIBREAK NBS moulded case circuit breakers (MCCBs). This accessory is designed to enhance control and convenience by enabling remote switching of the MCCB—both turning it ON and OFF----- from a distance.

Why Doesn’t a DC System Require a Grounding System Similar to an AC System?

Grounding and earthing are crucial for ensuring the safety and stability of electrical systems. While both AC and DC systems may require grounding, the requirements and implementation differ significantly. This article explores why DC systems do not always need grounding like AC systems and how regulations, including IEC standards, influence grounding practices in DC applications.

How to Install Internal Accessories on ETIBREAK NBS MCCBs

Installing internal accessories on a moulded case circuit breaker (MCCB) is a straightforward but essential process for enabling remote monitoring and improving system safety. In this blog, we’ll walk you through the step-by-step installation of two key accessories on the ETIBREAK NBS MCCB:

• Auxiliary Contact Block (PS) – for remote indication of the breaker’s ON or OFF position.
• Signaling Contact Block (Trip Indicator) – for detecting when the breaker has tripped due to a fault.

Tripping Characteristics of NH Fuse-links – What Do gG, aM mean..

A fuse protects low-voltage electrical conductors and cables from short circuits and overloads. There are different types of fuses, such as type D, type DO, NV, cylindrical, etc. Various markings on a fuse or fuse link indicate important parameters, including the rated current In (e.g., 20A in Picture 1), rated voltage U (e.g., 500V ), and short-circuit capacity (e.g., 120kA). This article focuses on the meaning of the gG marking, specifically the significance of the letter g (as opposed to a), which indicates the tripping or current-time (I-t) characteristic of the fuse.

IT Power Supply System in Relation to Grounding

An important element in protecting people (as well as property and animals) from the effects of electric current is the grounding of a part - the point of the electrical power supply system (e.g., a 20/0.4 kV transformer station that supplies a facility) and the grounding of exposed conductive parts. An exposed conductive part (such as the casing of an asynchronous motor) is normally not live; however, in the event of a fault, if a phase conductor comes into contact with the casing due to a failure, it can be dangerous to touch.

Motor protection circuit breaker MPE25 - Understanding the Tripping Characteristics

Motor protection circuit breaker is a crucial component for protecting asynchronous motors from overloads and short circuits. To understand how the protection works, it's important to first understand the basic operation of an asynchronous motor.

Simplify Power Dissipation Calculations with ETI’s Power Dissipation Configuration Tool

 We’re excited to introduce our Power Dissipation Configuration Tool, a user-friendly solution designed to optimize your electrical system performance. This tool enables engineers, designers, and installers to calculate power losses with precision, ensuring the safe and efficient operation of electrical installations.