Commutateur de transfert automatique ONCCY EATS2 4P 63 A – double alimentation

Automatic Transfer Switch ONCCY EATS2 4P 63A – Ultra-Fast Switching

The ONCCY EATS2 4P 63A automatic transfer switch (ATS) is a modular device designed to ensure continuous electrical supply to your installations. In the event of a failure or outage of the main source (grid power), it automatically switches to a backup source (battery, UPS, generator) in less than 50 milliseconds, then automatically returns to the main source once it is restored.

This device is essential for protecting sensitive equipment and ensuring uninterrupted operation of critical systems: photovoltaic systems with storage, IT equipment, security systems, professional freezers, home medical devices, etc.

Operating Principle – What is this switch used for?

The ONCCY EATS2 switch intelligently manages two power sources:

• Source A (Main): Usually the public power grid
• Source B (Backup): Storage battery, hybrid inverter, generator, or autonomous solar system

Under normal operation, the switch powers your installation from source A (grid). When it detects an anomaly (outage, voltage drop, micro-cut), it automatically switches to source B in under 50 ms. When source A is restored and stable, it automatically switches back.

This ultra-fast switching is imperceptible for most electrical and electronic devices, preventing service interruptions, data loss or unexpected reboots.

Practical Applications

The ONCCY EATS2 4P 63A automatic transfer switch integrates perfectly into various configurations:

• Hybrid photovoltaic installations: Switch between the grid and an inverter with battery storage
• UPS/Backup systems: Protects critical devices (servers, NAS, surveillance systems) from power outages
• Generators: Automatic switching between grid and generator without manual intervention
• Remote or semi-autonomous sites: Intelligent management between solar/wind production and a generator
• Shops and professional environments: Ensures service continuity (cash registers, emergency lighting, refrigeration)

Technical Specifications and Advantages

Key Advantages

• Ultra-fast switching: Less than 50 ms, transition is imperceptible
• Total circuit isolation: Sources A and B are never connected simultaneously, eliminating back-feed risks
• Mechanical interlock: Prevents simultaneous engagement of both sources
• Simplified installation: Standard DIN rail mounting, safe and clear wiring
• Proven reliability: Over 8 000 switching cycles
• Compact and modular: Easily integrates into existing electrical cabinets
• Versatile: Compatible with single-phase and three-phase installations

Recommended Configuration with Protection

For an optimal and safe installation, Wattuneed recommends pairing the ONCCY EATS2 with appropriate protection devices:

💡 Wattuneed Expert Tip: The automatic transfer switch does not replace protection devices (circuit breakers, RCDs). It must be installed upstream or downstream depending on your electrical architecture. For hybrid photovoltaic installations, place it between your inverter (source B) and the main electrical panel, after the production meter (source A).

Maintenance and Reliability

The ONCCY EATS2 switch requires very little maintenance. An annual visual check and an automatic switching test every 6 months are recommended for optimal operation. With a mechanical lifespan of over 8 000 operations, this device ensures long-term reliability for critical installations.

For further optimisation of your electrical installation, consult our technical resources on the Wattuneed blog:

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