Automatic Transfer Switch

EATS-W7 Dual Power Automatic Transfer Switch

The EATS-W7 Dual Power Automatic Transfer Switch (ATS) is a compact, integrated solution for critical power continuity in high-rise buildings, shopping malls, and fire control systems. Comprising two micro circuit breakers with mechanical interlocking and a built-in controller, it ensures reliable automatic switching between main and backup power sources. Designed for rated currents from 10A to 65A, it operates within -5°C to +40°C. Features include clear status indicators for easy fault diagnosis, manual/auto modes, and a simple structure for reliable performance and convenient maintenance.

Product Details

Product Descriprion

The EATS-W7 Dual Power Automatic Transfer Switch is an advanced PC-class component designed to guarantee uninterrupted power supply in essential applications such as high-rise buildings, airports, fire pumps, and life safety systems. It is engineered for systems rated at 50Hz/60Hz, with voltage options of 220V (2P) and 380V (3P, 4P), and a current range of 10A to 65A. Its core consists of two micro circuit breakers (for main and backup power), a mechanical and electrical interlock mechanism, and a built-in control unit, all assembled in a modular design for easy maintenance.

The switch features a quiet, single-motor drive for smooth, shock-free switching. It offers both fully automatic and manual override operations. In automatic mode, it continuously monitors the main power and transfers the load to the backup source within seconds of a failure, switching back once power is restored. The manual mode allows for controlled source selection or a full shutdown ("OFF" position) for safe circuit maintenance. A key safety aspect is the integrated mechanical interlock, which physically prevents both circuit breakers from closing simultaneously. The front panel provides comprehensive status indicators for both power sources and switch positions, greatly simplifying operation and fault diagnosis. Professional installation is mandatory to ensure safety and reliability.

Overview

The dual-power automatic transfer switch consists of two 2-pole, 3-pole, or 4-pole miniature circuit breakers, mechanical interlock transmission mechanism, built-in controller, etc. Its features include: compact size, simple structure, convenient operation, long service life; switch switching is driven by a single motor, ensuring smooth, noiseless operation with low impact force; equipped with both mechanical and electrical interlocks for reliable switching, operable both manually and automatically; the A.T.S. is equipped with terminals for user wiring to indicate the breaker status (open or closed); the A.T.S. panel is equipped with various status indicators.

Working Conditions

● Ambient air temperature: -5°C to +40°C, and the average temperature over 24 hours shall not exceed +35°C.

● Maximum monthly relative humidity: 90%. It can withstand the influence of humid marine air. Higher relative humidity is allowable at lower temperatures. Special measures should be taken for occasional condensation due to temperature changes.

● The altitude of the installation site should not exceed 2000 meters.

● Pollution Degree: The environmental pollution level at the installation site is Degree

● Installation Category: Category IV.

Model and Explanation

EATS

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Product name

Poles number

Rated current

Automatic transfer switch

CB Class

Design Code

X(Fire Type),

F(Power Type) and Basic-no Mark

Circuit Breaker Frame Current

2P 4P

10,16,20,25,32,40,50 and 63A

Application

The EATS-W7 Automatic Transfer Switch (hereinafter referred to as A.T.S.) is suitable for end-type dual-circuit power supply systems with 50Hz/60Hz, rated operational voltage of 220V (2P) / 380V (3P, 4P), and rated current from 10A to 63A. It can perform automatic switching between the commonly used power source and the standby power source to ensure power supply reliability. It is primarily used in high-rise buildings, shopping malls, fire pumps, fire fans, elevators, domestic water pumps, emergency lighting, and other similar locations.

Function Description

Automatic Principle: Set the Auto/Manual switch to the Auto position.

1. When the commonly used power source is normal, the switch automatically connects the common line to supply power to the load circuit.

2. When the commonly used power source is abnormal, it cuts off the common power supply line and automatically transfers to the standby power source to supply power to the load circuit.

Manual Principle:Set the Auto/Manual switch to the Manual position.

It allows manually cutting off the common power source and connecting the standby power source to supply the load circuit; or manually cutting off the standby power source and connecting the common power source to supply the load circuit; it can also simultaneously cut off both the common and standby power sources (double break), disconnecting the power supply system from the load for circuit maintenance.

Danger Warning

This device should only be installed, debugged, and maintained by qualified personnel.

The manufacturer shall not be held liable for any losses caused by failure to operate according to the instruction manual.

a) This device should only be installed, debugged, and maintained by qualified personnel.

b) Before installation, debugging, or maintenance, both main power supplies to the unit must be disconnected (active fire control signals that may cause electric shock must also be confirmed as disconnected).

c) During maintenance, a voltmeter must be used to verify that the power is disconnected.

d) The device must be reliably grounded as required.

e) The cabinet door must be reset before energizing the device.

f) Improper operation may lead to electric shock, fire, or explosion!

Panel Display & Operation

101: 3-pole Common Power Source Neutral Terminal and External Indicator Neutral Wire

LP1: Common Power Source Indicator

LP2: Common Power Source Close Indicator

LP3: Standby Power Source Indicator

LP4: Standby Power Source Close Indicator

201: 3-pole Standby Power Source Neutral Terminal and External Indicator Neutral Wire

Operation

Manual operation can be used regardless of whether the common and standby power sources are energized. During manual operation, set the Manual/Auto switch to the Manual position. When pushing the handle clockwise to the end position, the common power operating circuit breaker K1 closes, and the standby power operating circuit breaker K2 opens. When pushing the handle counterclockwise to the end position, the common power operating circuit breaker K1 opens, and the standby power operating circuit breaker K2 closes.

Panel display status: If the Common Power Source indicator light (I Power) or the Standby Power Source indicator light (I Power) is off, it indicates a fault with the input working power supply, and normal operation is not possible. Check the input power supply. Only after it is repaired and normal can operation commence. Set the manual-auto button to the Auto position. If the common power supply is normal, the switch will automatically transfer to close the common power operating circuit breaker K1, and the Common Close indicator light (I Close) on the panel will illuminate; when the common power source is abnormal, the switch transfers to close the standby power operating circuit breaker K2, and the Standby Close indicator light (I Close) will illuminate.

Common Faults and Troubleshooting

If the switch cannot transfer normally, please refer to the table below for common troubleshooting. If the problem persists after consulting this table, please contact our company or the local agent.

Fault Phenomenon	Fault Check	Troubleshooting
After power on, the controller indicator lights do not illuminate.	Power sampling wires are detached.	Reconnect the corresponding wires properly.
	The system neutral wire is not connected to the neutral terminal.	Reconnect the corresponding wires properly.
The controller display is normal but automatic transfer does not function properly.	Check if the Auto/Manual switch is in the Auto position.	Set the Auto/Manual switch to the Auto position.
Power supply is normal, the switch is in the closed position, but there is no power at the load end.	Check if the switch has tripped.	After eliminating the load fault, manually reset the switch.