ETI SSQ 340 load switch 3P 40A 1-0-2 (2421435)

ETI SSQ 340 is a three-position load switch designed for manual switching of electrical circuits in the 1-0-2 configuration. It is used in distribution boards, reserve power input systems, and other electrical installations where a circuit must be transferred between two sources or disconnected in the neutral position 0. The device complies with IEC 60947-3, the standard for low-voltage switching and disconnecting equipment, which confirms its intended use in control and distribution circuits. This model has 3 poles, so it is suitable for three-phase circuits. The rated current is 40 A, and the rated AC voltage is 400 V. These parameters make the switch appropriate for circuit switching in installations with corresponding supply characteristics without the need for more complex automatic solutions. The rated frequency of 50/60 Hz ensures compatibility with the most common electrical networks. Connection is provided for conductors with a cross-section of up to 16 mm². This is an important parameter when designing switchgear, because it determines which cable lines can be connected directly and helps maintain proper electrical contact. The IP20 protection degree indicates protection against access to live parts by a finger and makes the device suitable for installation inside electrical panels, enclosures, or other protected indoor mounting locations where exposure to dust and moisture is limited. The SSQ 340 series load switch is intended for applications that require clear position selection, safe circuit isolation, and straightforward manual operation. In practice, it is used in industrial, commercial, and engineering electrical systems for switching loads in three-phase networks, including installations with backup supply arrangements. The 1-0-2 operating logic provides an intermediate off position, which is useful when changing between two power sources or when a circuit must be fully disconnected before transfer. With its 3-pole design, 40 A current rating, 400 V AC rating, and conductor connection up to 16 mm², this ETI device fits into standard low-voltage distribution assemblies.