# Siemens 5ST3020 Auxiliary Switch 1NO+1NC for Circuit Breaker Signaling

**URL:** https://aio.lv/en/product--siemens-5st3020--1510460
**Data updated:** 2026-05-18 02:46 (EEST)
**Category:** Power Sockets
**Manufacturer:** Siemens
**Manufacturer code:** 5ST3020
**EAN:** 4001869187433
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 127.99 €
**Prices and availability valid until:** 2026-07-30 23:59
**Price without VAT (21%):** 105.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-5st3020--1510460

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Courier delivery to door | 22.07.2026 | 53.99 EUR |

## Summary description

The Siemens 5ST3020 is an auxiliary switch designed for reliable signaling of circuit breaker status. Featuring a 1NO (normally open) and 1NC (normally closed) contact configuration, this component provides essential feedback for electrical distribution systems. It is engineered for seamless integration with compatible Siemens circuit breakers, ensuring precise monitoring and operational safety in industrial and residential electrical installations.

## Long description

The Siemens 5ST3020 auxiliary switch is a precision-engineered component designed to provide reliable signaling of circuit breaker status. By integrating this device into your electrical distribution system, you gain real-time feedback on whether a circuit breaker is open or closed. Featuring a 1NO (normally open) and 1NC (normally closed) contact configuration, it serves as an essential tool for monitoring electrical safety and operational status in both residential and industrial environments.
Advantages
This auxiliary switch offers seamless compatibility with Siemens circuit breakers, ensuring a straightforward installation process and reliable performance. Its robust design contributes to the overall safety of electrical installations by providing accurate status signaling. The inclusion of both normally open and normally closed contacts allows for versatile integration into various control and monitoring circuits, making it a flexible solution for complex electrical setups.
Suitable for
Monitoring circuit breaker status in industrial electrical panels
Providing feedback signals for residential electrical distribution systems
Integration into automated control and alarm systems
Safety monitoring in commercial building power management
When it may not be suitable
This device is specifically designed for use with compatible Siemens circuit breakers and may not be compatible with circuit breakers from other manufacturers. It is not intended for direct power switching of high-load appliances and should only be used for signaling and control purposes.
Key specifications
Contact configuration: 1NO (normally open) and 1NC (normally closed)
Weight: 0.066 kg
Color: Multicolour
Function: Circuit breaker status signaling
How to use
The Siemens 5ST3020 auxiliary switch is designed to be mounted directly onto the side of a compatible Siemens circuit breaker. Ensure that the power supply to the electrical panel is completely disconnected before attempting installation. Align the switch with the designated mounting interface on the circuit breaker and snap it into place. Once physically attached, connect the signaling wires to the appropriate terminals according to your circuit diagram. After installation, verify the operation by manually toggling the circuit breaker to ensure the signaling contacts respond correctly.
What to consider before purchase
Verify compatibility with your specific Siemens circuit breaker model
Ensure the electrical system requirements match the contact ratings
Confirm there is sufficient physical space within the distribution board for the auxiliary switch
Usage recommendations
Always consult the technical documentation provided with your specific circuit breaker to ensure correct wiring and configuration. Regular testing of the signaling function is recommended to maintain the integrity of your electrical monitoring system.

## Specifications

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.066 kg |

### Design

| Feature | Value |
|---|---|
| Product colour | Multicolour |

## FAQ

### How much does the Siemens 5ST3020 Auxiliary Switch for Circuit Breakers cost, and is it available for purchase?

The price is 127.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 28 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 17.07.2026 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, Installment. All transactions are 100% secure and encrypted.

### Can Siemens 5ST3020 Auxiliary Switch for Circuit Breakers be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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 Siemens 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 Siemens 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

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