Block Open Frame 3.5 kVA Auto-Transformer with 208 V AC Primary and 400 V AC Secondary AT3 3,5-20/21-4

Block AT3 3,5-20/21-4 is an open frame auto-transformer designed for industrial and commercial applications requiring voltage transformation with high efficiency and low heat loss. This model features a power rating of 3.5 kVA with a primary input voltage of 208 V AC and a secondary output voltage of 400 V AC, suitable for three-phase systems.

The open frame construction allows effective heat dissipation, ensuring reliable performance in demanding environments. The transformer can be mounted on walls, floor-standing setups, or chassis utilizing the provided mounting holes for straightforward installation.

Wiring is facilitated via screw terminals providing secure and stable electrical connections. Operating frequency range from 50 Hz to 60 Hz supports compatibility with various power supply standards. The device is rated for operation at a maximum ambient temperature of 40°C, emphasizing its suitability for use in climates with moderate temperatures.

Dimensionally, the transformer measures 267 mm in length, 150 mm in width, and 220 mm in depth with a weight of 20 kg, making it compact yet robust for industrial deployment. It belongs to the AT3 series, known for quality and compliance with EN 61558-2-13 safety standards, and has been manufactured in Germany to ensure premium build quality.

This model supports reverse operation, increasing versatility across multiple industrial, laboratory, electrical, and manufacturing use cases. Applications include voltage regulation, power control, and integration into electronic components and power connectors systems.

Constructed with an open frame for efficient heat dissipation. Mountable on wall, floor standing, or chassis with easy installation using mounting holes. Screw terminal connections ensure secure wiring. Operates efficiently within 50 to 60 Hz frequency range.

Designed to operate at maximum ambient temperature of 40°C. Compact dimensions: 267 mm length, 150 mm width, and 220 mm depth. Robust and reliable with a weight of 20 kg. Series AT3 transformers tested to EN 61558-2-13 standards.

Reverse operation is possible for versatile applications. Manufactured in Germany ensuring quality and durability. Explore more Auto-Transformers and power supply components at EnvMart to find the right fit for your electrical and industrial needs.