# Magnetic door contact sensor BLOW 4917# HO-03 white

**URL:** https://aio.lv/en/product--blow-4917--11863752
**Data updated:** 2026-03-09 17:40 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** BLOW
**Manufacturer code:** 4917#
**EAN:** 5900804098881
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 4.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 4.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blow-4917--11863752

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Wired magnetic door contact sensor BLOW model 4917# (HO-03) in white. Designed to detect opening and closing of doors or windows using a reed switch and separate magnet, it provides a dry contact signal for alarm panels or automation systems. Compact housing and simple surface mounting make it suitable for residential and commercial security installations.

## Long description

Wired magnetic door contact sensor BLOW 4917# HO-03 in white is a compact reed-switch sensor designed to detect opening and closing of doors and windows. The device consists of a main contact housing and a separate magnet; when the magnet moves away from the contact the internal reed switch changes state and provides a dry contact signal suitable for connection to alarm panels, access control inputs or home automation controllers. Surface-mount installation and a low-profile white enclosure make the sensor unobtrusive on frames and sashes in both residential and commercial environments.
Advantages
The sensor provides a reliable dry contact output compatible with a wide range of wired alarm and automation systems. Its compact, surface-mount design allows installation on narrow frames and in limited spaces while maintaining a discreet appearance in white finish. The use of a separate magnet and reed contact ensures simple mechanical operation with no internal power supply required, reducing maintenance needs. The device is suitable for straightforward wiring and integration into existing security or automation setups.
Suitable for
Door and window intrusion detection in homes and apartments
Perimeter monitoring for offices and commercial premises
Integration with wired alarm panels and access control systems
Basic presence or state sensing for home automation projects
Key specifications
Operating principle: reed switch with separate magnet
Output type: dry contact (normally closed / normally open depending on wiring)
Mounting: surface mount on door/window frame and sash
Housing color: white
Application environment: indoor use (doors, windows, cabinets)
Connection: wired terminals for low-voltage alarm/automation inputs
How to use
Position the main contact housing on the fixed frame and align the magnet on the moving sash so that the two parts meet within the manufacturer’s recommended gap when the door or window is closed. Run low-voltage wiring from the sensor terminals to the alarm panel or automation controller and configure the input as a dry contact sensor. Verify correct operation by opening and closing the door or window and confirming the panel or controller registers the state changes. Follow standard electrical safety practices and disconnect power to the control system before making wiring connections.
Usage recommendations
For reliable operation, mount the sensor on clean, flat surfaces and avoid locations where the magnet and contact can be subject to repeated impact. Use appropriate cable routing and strain relief to protect connections from wear. Test the contact state after installation and during periodic maintenance to ensure consistent detection and compatibility with your alarm or automation system.

## FAQ

### How much does the Door magnetic contact sensor BLOW 4917# HO-03 cost, and is it available for purchase?

The price is 4.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 34 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 07.07.2026 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/11863752/67262426_large.webp