Controller SZR SZR-1ST 002471510

Automatic Power Transfer Switch Controller

This controller, known as SZR-1ST, is a key component in systems ensuring uninterrupted power supply. Designed to work with contactors, it enables automatic switching of loads between two power sources – main and backup. Its main task is to eliminate power outages caused by failures in the three-phase network, such as voltage loss, asymmetry, or incorrect phase sequence. The device finds application in both industrial installations and commercial and residential buildings requiring high power supply reliability.

Construction and application

The SZR-1ST controller is characterized by a compact design, occupying only 4 modules on a TH-35 rail. This makes it easy to fit into a standard distribution board. The device is adapted to operate with a supply voltage of 3x400V/250V AC 50Hz + N. Its operation is based on monitoring network parameters and quickly switching to backup power in the event of irregularities. This minimizes downtime and potential losses resulting from power outages. Fast response time – approximately 2 seconds for voltage loss and 1 second for its return – guarantees smooth and imperceptible switching for connected loads.

Key features and benefits

• Compact dimensions: Width of 4 modules facilitates installation even in limited distribution board space.
• Fast response: Minimum switching time (2s/1s) ensures continuous power supply to critical loads.
• Versatility: Designed to work with various types of contactors in self-switching reserve systems of the network-network type.
• High reliability: Guaranteed by the reputable manufacturer ETI Polam and quality certificates.
• Simple operation: Intuitive design makes installation and configuration easy.
• Safety: IP20 protection degree protects against accidental contact with live parts.
• Rated continuous current: 8A allows protection of circuits with moderate power consumption.
• Wide voltage range: Possibility of operation with both 230V and 400V AC networks increases application flexibility.

The SZR-1ST controller is a solid and reliable solution for anyone who values uninterrupted power supply and wants to avoid downtime caused by power grid failures. It is an ideal choice for both professional installers and end-users looking for a proven backup power system.