# Siemens 3VA9988-0AA12 Auxiliary Switch 1CO Type HQ

**URL:** https://aio.lv/en/product--siemens-3va9988-0aa12--1796942
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Computer Component Accessories
**Manufacturer:** Siemens
**Manufacturer code:** 3VA9988-0AA12
**EAN:** 4042949000037
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 23.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 19.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3va9988-0aa12--1796942

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3VA9988-0AA12 is an auxiliary switch designed for 3VA series molded case circuit breakers. This 1CO (changeover) contact, Type HQ, supports a maximum voltage of 240V AC or 250V DC. It provides reliable status signaling for industrial electrical distribution systems, ensuring precise monitoring and control of circuit breaker operations in various power management applications.

## Long description

The Siemens 3VA9988-0AA12 auxiliary switch is a high-quality component engineered specifically for integration with the Siemens 3VA series molded case circuit breakers. This Type HQ device features a 1CO (changeover) contact configuration, providing a reliable solution for monitoring the switching status of circuit breakers within industrial electrical distribution networks. Its robust design ensures consistent performance in demanding power management environments, facilitating accurate feedback for control and automation systems.
Advantages
This auxiliary switch offers seamless compatibility with the 3VA circuit breaker range, allowing for straightforward installation and reliable operation. By providing a clear changeover signal, it enables precise remote monitoring of the breaker's position, which is essential for maintaining operational safety and efficiency. The device is built to withstand standard industrial electrical conditions, ensuring long-term durability and minimal maintenance requirements in complex power distribution setups.
Suitable for
Industrial electrical distribution systems
Remote monitoring of circuit breaker status
Automation and control panels
Power management applications
When it may not be suitable
This auxiliary switch is designed exclusively for use with specific Siemens 3VA series molded case circuit breakers. It is not compatible with other circuit breaker series or brands and should not be used in applications exceeding the specified voltage ratings of 240V AC or 250V DC.
Key specifications
Contact configuration: 1CO (changeover)
Type: HQ
Maximum voltage (AC): 240V
Maximum voltage (DC): 250V
Compatibility: Siemens 3VA series molded case circuit breakers
How to use
Installation should be performed by qualified electrical personnel in accordance with the manufacturer's technical documentation. The switch is designed to be mounted directly into the designated slot within the 3VA molded case circuit breaker. Ensure the circuit breaker is de-energized before attempting installation. Once inserted, connect the signal wires to the appropriate terminals to integrate the switch into your monitoring or control circuit.
What to consider before purchase
Verify compatibility with your specific 3VA circuit breaker model
Ensure the control circuit voltage does not exceed 240V AC or 250V DC
Confirm that the installation environment meets standard industrial requirements
Usage recommendations: Regularly inspect the electrical connections and test the signaling functionality during routine maintenance cycles to ensure the continued reliability of your power distribution monitoring system.

## FAQ

### How much does the Siemens 3VA9988-0AA12 Auxiliary Switch cost, and is it available for purchase?

The price is 23.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 14.07.2026 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 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

## Image

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