Fronius Backup Controller 3PN-35A Automatic Transfer Switch

Name: Fronius Backup Controller 3PN-35A Automatic Transfer Switch
Brand: Fronius
Availability: InStock

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Specifications

Dimensions mm	100 x 198 x 66
Fault ride through	Yes
Grid types	TN-C-S, TN-S, TT
Max sea level m	2000
Mounting	DIN-Rail
Mpn	4.240.048.CK
Protection class	IP20
Rated current a	35
Rated power kva	24
Rated voltage v	3~ 230/400
Recent offer at	2026-07-28T08:06:41.179Z
Recent offer currency	EUR
Recent offer price	450.01
Recent offer unit label	Unit
Weight g	856

Description

The Fronius Backup Controller 3PN-35A is an automatic transfer switch (ATS) that enables seamless switchover to full backup mode during grid outages. The controller independently detects power loss and switches the household to emergency operation, then automatically returns to grid-parallel operation once power is restored, ensuring continuous power supply even when occupants are away.

Designed for quick and cost-effective installation, the unit mounts on a standard 35 mm DIN rail within the meter box, eliminating the need for a separate changeover box and reducing installation complexity. It is compatible with Fronius Primo, Symo GEN24 Plus, and Verto Plus inverters (15–20 kW power classes).

The device is rated for 3-phase AC supply at 230/400 V with a maximum current of 35 A, supporting grid types TN-C-S, TN-S, and TT. It includes fault ride-through capability and operates reliably at sea levels up to 2000 m.

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Frequently Asked Questions

Find quick answers to the most common questions about ordering, delivery and support.

When will my order be delivered?

We aim to deliver your order as quickly as possible (7–10 business days). Delivery is handled by an external logistics partner and shipped to the address you provided during checkout. We guarantee delivery no later than 30 days after order confirmation.

What are the shipping costs?

Shipping costs are calculated based on the order size and delivery address. In some cases, shipping is free above a certain order volume. This is clearly shown before you complete your purchase. If shipping costs apply, they are always visible at checkout.

Can I return my order?

Yes. You can return products within 14 days of receiving them. Please submit a return request first via the return form or by email. Once confirmed, the product must be sent back within 14 days, preferably in the original packaging and in the same condition.

Are there any costs for returns?

Yes. Returns are subject to an administration fee of 5% of the total order value. Return shipping costs are at your expense. After we receive and inspect the returned product, the remaining amount will be refunded within 7 days.

What warranty applies to the products?

Products are supplied by manufacturers or distributors. The manufacturer's warranty conditions apply to each product and may vary by brand and product type. Please consult the product documentation for exact coverage and duration. For inverter repairs performed via our service, we provide a 3-year warranty on proper operation of the repaired inverter.

Which payment methods are accepted?

We accept: American Express, Bancontact, iDEAL, Maestro, Mastercard and Visa. In some cases, and subject to credit approval, payment by invoice may also be possible. All available options are shown during checkout.

Can I cancel or change my order?

Cancellation is only possible before the order is processed. Please submit your cancellation request in writing. Cancellations without valid reason are subject to a fee of 5% of the total order value, with a minimum of €25. For custom-made or specially ordered products already processed, full costs may apply.

What should I do if my order arrives damaged?

If your order arrives damaged, contact us as soon as possible by email or phone. Include clear photos and a description of the issue. We will review your case and advise next steps. Reporting damage promptly helps us resolve it efficiently.

What happens if my delivery is delayed?

If a delay occurs, you will be informed in writing. We guarantee delivery no later than 30 days after confirmation. If delivery cannot be completed within that period, you may request a refund or a replacement product of equal value.

How can I contact customer support?

You can contact us by phone (+31 180 810402) or email (sales@search4solar.com). Our office is located in Barendrecht, the Netherlands, and we also operate from Valencia, Spain. We aim to respond to complaints within 7 days; if more time is needed, you will receive confirmation within 2 days with an estimated response date.