# Surge Arrester Varistor pro tec BY1-C/4 3221040 — Class C (Type II) overvoltage protection

**URL:** https://aio.lv/en/product--pro-tec-3221040--12106288
**Data updated:** 2026-03-20 09:56 (EET)
**Category:** Power Extension Cords & Surge Protectors
**Manufacturer:** pro tec
**Manufacturer code:** 3221040
**EAN:** 5906742652277
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 44.49 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 36.77 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--pro-tec-3221040--12106288

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 01.07.2026 | free |
| Pickup points | 06.07.2026 | 1.99 EUR |
| Courier delivery to door | 06.07.2026 | 4.99 EUR |

## Summary description

Varistor surge arrester pro tec BY1-C/4 3221040 is a class C (Type II) overvoltage protection device designed to clamp transient voltage spikes. It uses a varistor element to absorb and redirect surge energy, protecting electrical installations and connected equipment from impulse overvoltages. Typical use cases include distribution boards, consumer units and protection of sensitive electronics in commercial and residential systems.

## Long description

Varistor surge arrester pro tec BY1-C/4 3221040 — Class C (Type II) overvoltage protection is a compact device designed to reduce the risk of damage from transient voltage spikes. The unit employs a metal-oxide varistor element that clamps short-duration overvoltages by diverting surge energy away from connected equipment. It is intended for installation in low-voltage distribution systems where Class C (Type II) protection is required, such as consumer units, distribution boards and installations supplying sensitive electronics in commercial and residential environments.
Advantages
The varistor-based design provides fast-response suppression of transient overvoltages without mechanical switching. Its compact form factor allows integration in standard distribution panels and consumer units. As a Class C (Type II) device, it is suitable for handling higher energy impulses than basic protection types and can be combined with primary protection devices to form a coordinated multi-stage surge protection system. Installation and replacement are straightforward when performed by qualified personnel.
Suitable for
 Protection of distribution boards and consumer units from transient overvoltages
 Safeguarding sensitive electronics and appliances in residential and commercial systems
 Installation as the secondary stage in multi-stage surge protection schemes
 Environments where fast clamping of impulse voltages is required
Key specifications
 Technology: metal-oxide varistor (MOV) for transient suppression
 Protection class: Class C (Type II) suitable for distribution-level surge events
 Application: designed for low-voltage AC distribution systems and consumer units
 Form factor: compact module compatible with standard panel mounting
 Function: clamps and diverts transient energy to protect downstream equipment
How to use
Mount the surge arrester in the distribution panel according to relevant wiring regulations and the manufacturer's mounting guidance. Ensure the device is installed on the appropriate phase(s) and that protective earth is correctly connected where required. Commissioning should include verifying correct connections and suitable coordination with upstream and downstream protective devices. Replacement and service must be performed by qualified electricians, and the state of the varistor should be checked after significant surge events.
Usage recommendations
Use this Class C (Type II) varistor surge arrester as part of a coordinated surge protection strategy: combine with upstream primary protection for high-energy events and provide downstream protection for sensitive loads. Regular inspection after storms or known surges and adherence to local electrical standards will maintain effectiveness and safety.

## FAQ

### How much does the pro tec BY1-C/4 3221040 Varistor Surge Arrester cost, and is it available for purchase?

The price is 44.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 21 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 01.07.2026 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 pro tec 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 pro tec 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/12106288/67642851_large.webp