ETI SSQ 3100 load changeover switch 3P 100A 1-0-2 (2421438)

ETI SSQ 3100 is a three-position load changeover switch designed for switching electrical circuits between two power sources or lines. It is used in distribution boards, backup power systems, and other electrical installations where the load must be transferred manually from one input to another without changing the wiring scheme. The 1-0-2 switching sequence provides clear source selection, with the middle “0” position allowing circuit disconnection when required. The device is rated for 100 A at 400 V AC and operates at 50/60 Hz, which makes it suitable for three-phase networks and other power circuits within the specified electrical limits. Its 3-pole configuration enables simultaneous switching of three conductors, which is the typical solution for controlling multi-phase supply lines. The AC-22B utilization category indicates that the switch is intended for operation with resistive and mixed loads, including circuits where switching is performed under load conditions. Compliance with IEC 60947-3 confirms that the device belongs to the group of switches, disconnectors, and load-break switches designed for standardized switching duties. This standard is important for installations where safe manual commutation and clear operating positions are required. The switch supports conductors with a cross-section of up to 50 mm², which simplifies integration into power circuits with higher current demand and allows connection with appropriately sized cables. With an IP20 degree of protection, the switch is intended for installation inside electrical enclosures, switchboards, or other protected mounting locations. It is not designed for exposure to dust or moisture in open environments, so it should be used where additional enclosure protection is provided. The SSQ 3100 series designation identifies the product within ETI’s load switching range, while the 1-0-2 configuration makes it suitable for applications involving source transfer, line selection, and isolation within low-voltage power distribution systems. Overall, this three-pole 100 A changeover switch is a practical component for manual power switching tasks in commercial, industrial, and backup supply installations where controlled transfer between two circuits or supply inputs is required.