Automatic Transfer Switch (ATS)

An Automatic Transfer Switch (ATS) is a critical component in standby power systems that ensures uninterrupted electricity supply by automatically switching connected loads between the main utility power source and a backup gas generator set.

During normal operation, the ATS supplies power from the utility grid. When a power outage, voltage drop, or frequency abnormality is detected, the ATS sends a start signal to the gas generator. Once the generator reaches stable operating conditions, the ATS automatically transfers the load to generator power. When utility power is restored, it safely transfers the load back and shuts down the generator after a cooling period.

ATS systems are widely used in hospitals, data centers, industries, commercial buildings, telecom facilities, and critical infrastructure where continuous power availability is essential.

Key Features

• Automatic utility-to-generator transfer
• Fast power changeover during outages
• Generator start/stop control interface
• Prevents power back-feeding
• Microprocessor-based controller
• Digital display and monitoring
• Overload and short-circuit protection options
• Manual override operation
• Remote monitoring capability
• Compatible with AMF (Automatic Mains Failure) panels
• BMS and SCADA integration options

Common Applications

• Gas Generator Backup Systems
• Hospitals & Healthcare Facilities
• Data Centers
• Industrial Plants
• Commercial Buildings
• Shopping Malls
• Hotels
• Banks & Financial Institutions
• Telecom Stations
• Emergency Power Systems

Common ATS Types

• Open Transition ATS
• Closed Transition ATS
• Delayed Transition ATS
• Bypass Isolation ATS
• Automatic Mains Failure (AMF) Panel
• Smart ATS with Remote Monitoring

Typical Specifications

• Voltage: 220V / 380V / 400V / 415V AC
• Frequency: 50Hz / 60Hz
• Current Rating: 40A – 4000A+
• Poles: 2P / 3P / 4P
• Transfer Time: 0.1–5 seconds (model dependent)
• Control Voltage: 12V / 24V / 110V / 220V

Main Components

• Automatic Transfer Switch Mechanism
• Controller Module
• Motorized Circuit Breakers or Contactors
• Utility & Generator Sensors
• Control Relays
• Display Interface
• Communication Module
• Protection Devices

Popular Brands

• Schneider Electric
• ABB
• Eaton
• Siemens
• Socomec
• GE
• ASCO Power Technologies
• Cummins
• Caterpillar
• Generac
• Kohler
• Deep Sea Electronics (DSE)