ETI SSQ 2125 Load changeover switch 2P 125A 1-0-2 (2421429)

The ETI SSQ 2125 is a three-position load changeover switch designed for manual switching of electrical circuits in the 1-0-2 sequence. It is used in distribution boards, incoming distribution units, and other low-voltage installations where power must be transferred between two sources or a circuit must be isolated in the zero position before maintenance. This makes the device suitable for reserve power arrangements and controlled changeover of supply lines. The switch belongs to the SSQ 2125 series and is built as a 2-pole unit with a rated current of 125 A. Its rated AC voltage is 400 V, and the rated frequency is 50/60 Hz, so it can be used in common AC power systems. The AC-22B utilization category indicates suitability for switching moderately inductive loads, which is important when the circuit includes equipment with normal inrush or operational load variation. The 1-0-2 switching scheme provides clear selection between two active positions with an intermediate OFF state, improving operating control during switching operations. For connection, the device accepts conductors with a cross-section of up to 50 mm², which supports use in power circuits with substantial current demand. Compliance with IEC 60947-3 confirms that the device is intended for low-voltage switchgear and controlgear applications, including switches, disconnectors, and combined switching devices. This standard is important for electrical design and installation, as it defines the requirements for operational performance and application scope. The protection degree IP20 means the product is intended for installation inside electrical enclosures or switchboards, where access is limited and additional protection against contact is provided by the cabinet itself. In practical use, the switch is applied wherever a manual, clearly defined and safe changeover of supply is required. Its 2-pole configuration, 125 A rating, and 400 V AC nominal voltage make it a fitting solution for distribution and isolation tasks in professional low-voltage systems.