A Backup Changeover Switch (also called a Transfer Switch or Source Changeover Switch) is used in electrical systems to switch connected loads from the primary power source to an alternative backup power source during a power failure.
It ensures a safe and reliable transition between utility power and backup power without allowing both sources to operate simultaneously, preventing electrical faults and equipment damage. Changeover switches are available in manual, automatic (ATS), and motorized versions depending on the application.
They are commonly installed in homes, offices, hospitals, industries, data centers, and solar backup systems where uninterrupted power supply is essential.
Key Features
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Safe switching between two power sources
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Prevents back-feeding into the electrical grid
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Manual or automatic operation options
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Fast transfer during power failure
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Compact and durable construction
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High electrical isolation capability
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Overload and short-circuit protection (selected models)
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Compatible with generators and solar inverter systems
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Easy installation and maintenance
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Available for single-phase and three-phase systems
Common Applications
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Residential Backup Power Systems
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Solar Hybrid Systems
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Generator Backup Systems
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Offices & Commercial Buildings
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Hospitals & Clinics
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Data Centers
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Industrial Facilities
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Telecom Systems
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Emergency Power Systems
Common Types
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Manual Changeover Switch – Hand-operated switching between power sources
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Automatic Transfer Switch (ATS) – Automatically transfers power during outages
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Motorized Changeover Switch – Remote-controlled switching for large systems
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Dual Power Automatic Transfer Switch (DP ATS) – Automatic switching between two electrical supplies
Typical Specifications
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Rated Voltage: 220–240V / 380–415V AC
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Phases: Single Phase / Three Phase
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Current Rating: 16A – 4000A+
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Poles: 2P, 4P
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Transfer Time: Milliseconds to seconds (ATS type)
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Mounting: Wall-mounted, panel-mounted, or cabinet-installed
Main Components
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Switching Mechanism
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Contactor or Motor Operator
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Control Module (ATS)
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Circuit Protection Devices
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Terminal Blocks
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Manual Operating Handle
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Status Indicators
Popular Brands
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Schneider Electric
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ABB
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Siemens
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Socomec
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Eaton
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Legrand
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GE
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Chint
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LS Electric
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Lovato Electric
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Hyundai Electric
