# Hager ST303 Bell Transformer 230V/8-12V 8VA

**URL:** https://aio.lv/en/product--hager-st303--1520551
**Data updated:** 2026-05-18 02:52 (EEST)
**Category:** Power Sockets
**Manufacturer:** Hager
**Manufacturer code:** ST303
**EAN:** 3250615703033
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 40.99 €
**Prices and availability valid until:** 2026-08-01 23:59
**Price without VAT (21%):** 33.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hager-st303--1520551

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 21.07.2026 | free |
| Pickup points | 24.07.2026 | 1.89 EUR |
| Courier delivery to door | 24.07.2026 | 4.99 EUR |

## Summary description

The Hager ST303 is a high-quality bell transformer designed for reliable operation in electrical systems. It features an input voltage of 230V AC and provides an output of 8-12V AC with a power rating of 8VA. This compact device is ideal for powering doorbells and signaling systems in residential and commercial installations, ensuring consistent performance and safety.

## Long description

The Hager ST303 bell transformer is a professional-grade electrical component engineered to provide a stable and safe power supply for low-voltage signaling devices. Designed for seamless integration into standard electrical distribution boards, this transformer converts a 230V AC mains input into a selectable 8V or 12V AC output. Its robust construction ensures long-term reliability for residential and commercial signaling applications, maintaining consistent performance under standard operating conditions.
Advantages
This transformer stands out due to its high build quality and adherence to safety standards, which are hallmarks of Hager electrical equipment. The compact design allows for efficient use of space within modular enclosures, while the dual-voltage output provides flexibility for various doorbell models and signaling hardware. Its thermal stability and efficient power conversion contribute to a durable solution that minimizes the risk of overheating during intermittent use.
Suitable for
Powering residential doorbell systems
Operating low-voltage buzzers and chimes
Signaling systems in commercial buildings
Replacement of existing modular bell transformers
When it may not be suitable
This device is not intended for continuous high-load applications or powering devices that require a DC power supply, as it provides an AC output only. It is also unsuitable for outdoor environments unless installed within a properly rated, weather-protected enclosure.
Key specifications
Input voltage: 230V AC
Output voltage: 8V or 12V AC
Power rating: 8VA
Mounting type: DIN rail
Frequency: 50/60 Hz
How to use
The Hager ST303 is designed for installation by qualified personnel within a standard electrical distribution board. It mounts directly onto a DIN rail. Connect the 230V mains supply to the primary input terminals and the doorbell or signaling device to the secondary output terminals, selecting either the 8V or 12V tap according to the requirements of your connected device. Ensure all connections are tightened securely and the circuit is protected by an appropriate miniature circuit breaker.
What to consider before purchase
Verify the voltage requirements of your doorbell or chime
Ensure there is sufficient space on the DIN rail in your distribution board
Confirm that the total power consumption of the connected devices does not exceed 8VA
Usage recommendations: Always disconnect the main power supply before beginning installation. Periodically inspect the wiring connections to ensure they remain secure and free from oxidation to maintain optimal performance.

## Specifications

| Feature | Value |
|---|---|
| Quantity | 1 |
| AC input voltage | 230 |

## FAQ

### How much does the Hager ST303 Bell Transformer cost, and is it available for purchase?

The price is 40.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 29 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 21.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Hager products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Hager service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/1520551/57989961_large.webp