ETI SSQ 4125 Load Transfer Switch 4P 125A 1-0-2 (2421449)

ETI SSQ 4125 is a manual load transfer switch designed for switching electrical circuits in the 1-0-2 position scheme. It is used in distribution boards, incoming-distribution units, and other low-voltage installations where it is necessary to transfer supply between two sources, disconnect a circuit, or select one of two operating states manually. The three-position logic makes operation clear and helps organize power switching in circuits that require controlled changeover rather than automatic transfer. The device belongs to application category AC-22B, which means it is intended for switching mixed resistive and inductive loads under typical conditions found in building and industrial distribution systems. The rated current is 125 A at a rated AC voltage of 400 V, so the switch is suitable for power circuits with significant load levels. Four poles allow simultaneous switching of all conductors in a three-phase network, which is important when complete line isolation or full phase switching is required. SSQ 4125 operates at a nominal frequency of 50/60 Hz, so it can be used in systems based on the most common supply frequencies. The device supports conductor cross-sections up to 50 mm², which simplifies integration into high-current power circuits and ensures compatibility with suitably sized conductors used in distribution assemblies. The product is manufactured according to IEC 60947-3, the standard covering low-voltage switches, disconnectors, and load-break switches. The IP20 degree of protection indicates basic protection against access to hazardous parts, so the switch is intended for installation inside enclosed electrical cabinets, switchboards, or other protected equipment. As part of the SSQ 4125 series, this model is used wherever manual load transfer, circuit selection, or switching between two power sources must be performed in a structured and technically clear way. Its 4-pole, 125 A configuration and 1-0-2 switching arrangement make it suitable for electrical distribution applications that require a straightforward and standards-compliant solution for manual power control.