An Isolator, also known as a disconnecting switch, is a mechanical switch used in electrical systems to completely disconnect a part of the circuit for maintenance, repair, or safety purposes. It is operated manually and is not meant to break the circuit under load, meaning it should only be operated when the current flow is already interrupted (no live current).
Key Features of an Isolator
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Manual operation for safe isolation.
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Used to ensure safety during maintenance.
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Provides visible disconnection in many designs.
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Installed on both high-voltage and low-voltage systems.
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Often used in conjunction with circuit breakers.
Types of Isolators
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Single Break Isolator – Disconnects one contact point.
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Double Break Isolator – Disconnects two contact points for better safety.
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Pantograph Isolator – Commonly used in substations and high-voltage systems.
Applications of Isolators
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Power plants and substations – To isolate equipment for servicing.
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Industrial and commercial panels – For manual shutdown of machinery.
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Residential buildings – Main switch to disconnect supply during faults or maintenance.
