The TOQ3-125/4P is a 4-pole, 125A automatic transfer switch (ATS) designed for 3-phase, 4-wire systems operating at AC 400V. Built in an MCB-style form factor, this dual power switch enables seamless automatic switchover between city grid power and a generator, ensuring continuous power supply to your home or commercial facility. The integrated voltage relay monitors incoming supply and triggers an automatic transfer whenever the main power fails or is restored, minimizing downtime. It features a sealed contact design for enhanced durability against dust and demanding installation environments. The switch offers protection against phase loss, over-voltage, and under-voltage conditions, improving overall system reliability. With a main circuit insulation voltage of AC 400V and an impulse withstand voltage of 4kV, it meets IEC/EN60947-6-1 standards. The unit supports both Auto and Manual operating modes and is compatible with 50/60Hz frequencies. It carries CE certification and complies with LVD high voltage requirements, making it a dependable solution for critical dual power switching applications.