What are Solid-State Circuit Breakers or SSCB?
Circuit breaker protects electrical systems. When there’s a fault—like a short circuit or overload—it disconnects the supply so equipment doesn’t get damaged. Now traditionally, circuit breakers are mechanical. That means they rely on physical movement—contacts opening, springs releasing, arcs forming and being extinguished. And...
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Residual Voltage Protection — Why Is It Important?
Residual voltage and current protection might sound like something out of an engineering textbook, but once we break it down, it’s actually quite easy to understand — and very important for electrical safety. In this article, we’re going to walk through what these protections...
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What is IDMT Curve and how to calculate it? Explained!
IDMT is an abbreviation for Inverse Definite Minimum Time. Essentially, an IDMT curve informs us how long a protective relay will wait before tripping when it discovers an overcurrent fault. The “Inverse” portion is that the larger the fault current, the quicker the relay...
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Overcurrent Protection in Switchboards – How to Design It?
When we install or design an electrical switchboard, we need to ensure that if anything goes wrong (such as excessive current flowing), the system responds appropriately to safeguard people, equipment, and cables. That’s what overcurrent protection is all about. Overcurrent protection is broadly classified...
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How Utilisation Categories Affect Equipment Selection
From an engineering standpoint, utilisation categories identify the kind of electrical loading and switching operation the device can accommodate. As opposed to presuming that all loads are alike, utilisation categories understand that: • Motor-driven loads produce high starting currents • Loads with resistance do...
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Utilisation Categories (IEC 60947): A Practical Guide for Australian Engineers
Utilisation categories define how demanding a switching task is. They are specified in IEC 60947 and classify loads based on their electrical behaviour during switching. They consider the type of load, how it operates, and the stress placed on contacts. Instead of focusing only...
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Generator Transfer Switch – What It Is and Why It Matters
One of the most common questions people ask is this: Can I just buy a generator and use it without a transfer switch? The short answer is—it depends on the type of generator you’re using. If you’re dealing with a standby generator, then no,...
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Leakage Current – How to Prevent Shocks and Electrical Fires
Leakage current is the small, unintended flow of electrical current that escapes the intended path in a circuit. Ideally, current flows from the supply, through the live conductor, through the load, and back via the neutral conductor. In reality, insulation is never perfect, wires...
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Which Industries Need Arc Flash Studies the Most?
An Arc Flash Study is an engineering calculation for comprehensive purposes to find potential arc flash risk in an electrical system. The objective is to establish levels of incident energy, assess risks, and include safety recommendations, such as adequate Personal Protective Equipment (PPE), redesign...
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Which is better, solid state relay or mechanical relay?
A solid state relay is an electronic switching device, employing semiconductor components like thyristors, triacs, and diodes to accomplish its switching operations. The best thing is that it does not employ moving parts to open and close electric contacts, as required for mechanical relays....
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