# Magnetic Contact Sensor SATEL B-21 cylindrical type for doors and windows, surface-mounted

**URL:** https://aio.lv/en/product--satel-b-21--11863761
**Data updated:** 2026-03-09 17:40 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** SATEL
**Manufacturer code:** B-21
**EAN:** 5905033338104
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 7.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 6.60 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--satel-b-21--11863761

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.89 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

SATEL B-21 is a cylindrical magnetic contact sensor designed for monitoring doors and windows. The surface-mounted magnetic switch provides contact detection between sensor body and magnet, enabling basic intrusion monitoring and integration with alarm control panels. Suitable for residential and commercial use where a compact, externally mounted reed switch is required.

## Long description

SATEL B-21 is a cylindrical surface-mounted magnetic contact sensor designed for monitoring the open/closed state of doors and windows. The device consists of a compact reed switch body and a matching magnet; when the two parts are aligned and the magnet is moved away, the contact opens, signalling a change of state to a connected alarm control panel or wired detection circuit. The SATEL B-21 is intended for applications that require a discreet, externally mounted magnetic sensor with straightforward installation and reliable basic intrusion detection.
Advantages
The cylindrical design offers a small footprint that is easy to fit on narrow frames and tight installation spaces. Surface-mount construction eliminates the need for drilling into frames or sashes, making installation simpler on many door and window types. The reed switch mechanism provides a passive, low-maintenance method of contact detection compatible with standard wired alarm inputs. Materials and construction are suitable for indoor and protected outdoor use where a compact external sensor is preferable.
Suitable for
Monitoring opening/closing of residential and commercial doors
Detecting window openings on frames where recessed sensors are impractical
Integration with wired alarm panels, control units and security systems
Use in retrofit installations where surface mounting is required
Key specifications
Form factor: cylindrical surface-mounted magnetic contact
Detection type: reed switch contact activated by magnet proximity
Mounting: external/surface mounting on door or window frames
Operating environment: indoor and protected outdoor locations
Connection: wired contact output compatible with standard alarm inputs
How to use
Mount the cylindrical sensor body on the fixed frame and align the magnet on the movable sash or door so that the two parts come into contact when the door or window is closed. Secure both components with appropriate screws or adhesive as permitted by the mounting surface. Route and connect the sensor’s wires to the alarm control panel or detection circuit following the panel manufacturer’s wiring diagram and ensure correct polarity and tamper/NC/NO configuration as required. Test the contact by opening and closing the door or window and verify that the control panel registers the state changes.
Usage recommendations
Install the sensor where the body and magnet will remain aligned during normal operation. Avoid mounting on extremely flexible or moving trim where alignment could shift. For exposed outdoor locations, provide protection from direct weather and strong mechanical impact. Verify compatibility with the alarm control panel input type (normally closed, normally open, or supervised loop) before final connection.

## FAQ

### How much does the Magnetic Contact Sensor SATEL B-21 cost, and is it available for purchase?

The price is 7.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 70 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 13.07.2026 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 SATEL 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 SATEL 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/11863761/67262438_large.webp