# Door contact sensor BLOW 4922# model HO-03C brown magnetic reed switch

**URL:** https://aio.lv/en/product--blow-4922--11863492
**Data updated:** 2026-03-09 17:40 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** BLOW
**Manufacturer code:** 4922#
**EAN:** 5900804098935
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blow-4922--11863492

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.99 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

Wired door contact sensor BLOW 4922# (HO-03C) in brown, using a magnetic reed switch (kontaktron) to detect door or window opening. Designed for integration with alarm and access control systems, it provides a discreet surface-mounted magnetic contact and a matching magnet. Suitable for residential and commercial security installations to monitor entry points and trigger alarms or automation events.

## Long description

Wired door contact sensor BLOW HO-03C in brown is a surface-mounted magnetic reed switch designed to detect opening and closing of doors and windows. The device consists of a compact contact housing and a matching magnet that together form a normally closed magnetic circuit, opening when the magnet is separated from the contact. It is intended for integration with alarm panels, access control systems and simple automation circuits where reliable detection of an entry point state is required.
Advantages
The contact sensor provides a low-profile, discrete appearance in brown finish suitable for many interior surfaces. Its wired connection offers stable signal transmission without the need for batteries, and the magnetic reed switching element ensures long operational life with minimal maintenance. The surface-mounted design simplifies installation on door frames or window sashes and the device is compatible with a wide range of alarm and control systems that accept normally closed contact inputs.
Suitable for
 Residential entry and window monitoring
 Commercial premises access control and intrusion detection
 Integration with alarm panels and wired security systems
 Simple automation tasks that require door/window state feedback
Key specifications
 Operating principle: magnetic reed switch (kontaktron)
 Mounting type: surface-mounted
 Finish / colour: brown
 Connection type: wired contact leads for normally closed circuits
 Typical applications: doors, windows, and other movable panels
How to use
Mount the contact housing on the fixed frame and the magnet on the moving part so that the two elements align and close when the door or window is shut. Connect the wired leads to the alarm panel or control input configured for normally closed contact monitoring. Verify alignment and operation by opening and closing the door or window while observing the control panel's input status. Ensure cable routing is protected from pinch points and secure all components with appropriate screws or adhesive as recommended for the installation surface.
Usage recommendations
Place the sensor and magnet within the manufacturer's recommended gap distance for reliable operation and avoid locations exposed to strong electromagnetic interference or direct moisture. Use the brown finish to match interior fittings and check compatibility with the control panel input type before installation.

## FAQ

### How much does the Door contact sensor BLOW 4922# HO-03C cost, and is it available for purchase?

The price is 5.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 20 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 09.07.2026 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 BLOW 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 BLOW 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/11863492/67262060_large.webp