Backup automatic power switch for generators | for uninterrupted power supply | 4P | 630A | 400/415V

The controller monitors the voltage of the main and backup sources. If phase failure, loss of voltage, undervoltage or overvoltage is detected, the ATS can transfer the load to another suitable source after the configured delay. When the main supply is restored, automatic return or operation without automatic return can be selected.

4P switching includes the three phase conductors and neutral conductor. The protective PE conductor is not part of the ATS switching circuit and must be connected according to the design of the specific electrical system.

Main supply fails → ATS detects the fault → generator start signal is issued → generator voltage is checked after the configured delay → load is transferred to the backup generator.

Although the main ATS system is three-phase 400/415V, the controller instructions specify undervoltage and overvoltage thresholds in the 160–290V range. This corresponds to monitoring individual 230V phase voltages relative to neutral.

The specified Iq, Icm and Icw characteristics describe the switching device's capability to operate under short-circuit conditions with appropriate protection coordination. The ATS must be used together with correctly selected circuit breakers or fuses.

• 630A rated current for three-phase backup power systems.
• 4P construction switches three phases and neutral.
• 400/415V AC for three-phase four-wire systems.
• AC-33B utilization category intended for switching equipment capable of controlling mixed and motor loads under the corresponding utilization conditions.
• Mains–mains and mains–generator operating modes.
• Automatic and manual switching.
• Adjustable undervoltage and overvoltage thresholds.
• Adjustable 0–300s transfer and return delay.
• Generator start and stop control.
• OFF position allows the load to be disconnected from both sources.
• Phase failure monitoring.
• Fire-fighting system control interface.
• LED display for monitoring the main and backup source status.
• High short-circuit ratings: Iq 100kA, Icm 50kA, Icw 25kA / 0.2s.

• Not intended for parallel operation of sources: only one source supplies the load at a time.
• Not a source synchronisation device.
• ATS does not replace short-circuit protection: appropriate circuit breaker or fuse coordination is required.
• Neutral and PE arrangement must be designed according to the specific electrical system and generator earthing arrangement.

In a commercial or industrial facility, the main 400/415V three-phase grid is used as the normal power source and a three-phase generator as the backup source. The ATS continuously monitors the phases and voltage of the main supply. If a phase is lost or the voltage falls below the configured threshold, a generator start signal is issued after the configured delay. Once the generator voltage stabilises, the ATS transfers L1, L2, L3 and N to the backup source. When the main supply is restored, the load can automatically return to the main source after the configured return delay.

630A.

400/415V AC, 50Hz for a three-phase four-wire system.

Four conductors are switched – L1, L2, L3 and N.

Yes. The controller supports mains–generator operation and includes generator start control.

Yes. Mains–mains operating mode is supported.

It can. Automatic transfer with automatic return or automatic transfer without automatic return is supported.

Yes. Transfer and return delays are adjustable from 0 to 300s.

Yes. Phase failure / voltage loss monitoring is provided for both the main and backup sources.

Yes. According to the controller instructions, the undervoltage threshold is adjustable from 160–200V and the overvoltage threshold from 240–290V.

Yes. Automatic and manual control modes are available.

Yes. In manual mode, the disconnected OFF position can be selected.

The rated insulation voltage Ui is 800V AC.

Uimp – 8kV.

AC-33B.

The 630A 4P ATS must be selected and connected according to the design of the specific electrical installation. Cable cross-sections, prospective short-circuit current, circuit breaker or fuse coordination, neutral and PE arrangement, generator earthing and control logic must be evaluated. The ATS is not intended for parallel connection of two AC power sources and does not replace short-circuit protection devices.