Modular automatic backup power transfer switch with protection functions | for generators | for uninterrupted power supply | 4 inputs | 2P | 100A | 230V

The device can be used with different single-phase power sources, such as the utility grid, generator, solar inverter or energy storage system. If the priority source fails or moves outside the permitted parameters, the load is automatically transferred to another available source according to the configured priority sequence.

A typical transfer sequence can be L1 → L2 → L3 → L4. For example, L1 can be the main utility grid, L2 a generator, L3 a solar inverter and L4 an additional backup source. The priority sequence can be changed according to the requirements of the specific system.

The neutral and protective earth arrangement of a generator, inverter or other backup source must be designed according to the specific electrical installation. 2P switching itself does not replace the requirement to correctly design the N and PE conductor system.

The integrated overvoltage function monitors the mains voltage level. It does not replace a separate SPD designed to limit lightning-induced or other transient surge voltages.

The feedback output is potential-free. It does not itself provide 12V, 24V or 230V. The contacts operate as a conventional relay changeover contact: COM, NO and NC. An external PLC, controller, alarm system or other device provides the voltage used for the signal circuit.

COM/NO/NC contacts alone do not indicate which specific status is assigned to them. Before connecting the contacts to a PLC, generator controller or alarm system, the contact diagram for the specific device must be followed.

Main utility supply fails → ATS detects the fault → dry contact changes state → generator controller receives a start command → once the generator reaches acceptable electrical parameters, the ATS transfers the load.

This type of transfer switch is designed to select one power source. It is not intended to synchronise the phases of different AC sources or operate them in parallel. The generator and inverter must have their own appropriate control and protection systems.

• Up to 4 power sources in a single transfer device.
• 100A rated current suitable for higher-power single-phase systems.
• 2P switching disconnects both phase and neutral.
• Automatic source selection reduces the need for manual switching.
• Configurable priority allows the main and backup power sources to be selected.
• Manual mode allows the operator to select the required input.
• Overvoltage, undervoltage, overcurrent and overheating protection.
• Adjustable delays allow the transfer logic to be adapted to the specific system.
• Display of all 4 input voltages and output current allows local monitoring of system status.
• Potential-free COM/NO/NC contacts allow integration with PLC, BMS, EMS, alarm systems or generator controllers.
• Generator control capability is suitable for automatic backup power systems.
• Audible alarm provides fault notification.
• 35mm DIN rail mounting allows integration into an electrical distribution panel.

• Single-phase system: designed for 230V AC single-phase sources, not for a standard 3x400V three-phase ATS system.
• Up to 100A: the load and conductor cross-sections must be selected according to the actual current and installation conditions.
• Dry contacts do not provide voltage: the PLC or other controller must provide its own signal circuit supply.
• This is not an SPD: voltage monitoring does not replace a surge protective device.
• Not designed for parallel source operation: the load must be supplied by one selected source at a time.

A facility uses the main utility grid, a backup generator and a solar inverter. L1 is selected as the main source. If L1 fails or its voltage moves outside the configured limits, the ATS selects another suitable source after the configured delay time. At the same time, a dry contact can transmit a signal to the generator controller or PLC. When the priority L1 supply is restored, the system automatically transfers the load back to the main source after the configured delay.

Up to four single-phase 230V AC power sources.

Yes. The device is designed for systems using the utility grid, a generator and other backup power sources.

Yes, provided that the inverter AC output electrical parameters comply with the requirements of the 230V AC system and the installation is designed so that the sources cannot be improperly connected in parallel.

Yes. A 2P design is used, so both the phase and neutral conductors are switched.

The rated current is 100A.

Yes. The specified overcurrent setting range is 1A to 100A.

Yes. The device provides a power source priority selection function.

Yes. Both automatic and manual transfer modes are supported.

It is a potential-free COM/NO/NC relay contact. It does not itself provide 12V, 24V or 230V and is used as a logic signal for another controller.

Yes. This is one of the most typical applications. The PLC input circuit supply must be provided by the PLC or another external power source.

It can be used together with a generator controller via a dedicated dry contact. The contact itself does not power the generator – it only transmits a control status.

Yes. The display shows the output load current and the voltages of all four inputs.

Yes. An audible alarm can be activated in the event of an electrical fault and can be muted.

35mm DIN rail mounting is supported, as well as surface / wall mounting.

210x118x73mm.

A 100A ATS must be installed and connected according to the design requirements of the specific electrical installation. Cable cross-section, short-circuit protection, circuit breaker or fuse characteristics, neutral and PE arrangement, generator and inverter control logic and overall system selectivity must be taken into account. Dry contacts must only be connected according to the specific contact wiring diagram. The ATS is not designed for parallel connection of different AC sources or for phase synchronisation between them.