# Magnetic contact sensor Magnetic Contact MS-20M AM422 — reed switch security sensor, surface-mount

**URL:** https://aio.lv/en/product--magnetic-contact-sensor-magnetic-contact-ms-20m-am422-reed-switch-security-sensor-surface-mount--4438977
**Data updated:** 2026-02-12 14:08 (EET)
**Category:** Smart Sensors
**Manufacturer code:** AM422
**EAN:** 3100000790974
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 6.99 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 5.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--magnetic-contact-sensor-magnetic-contact-ms-20m-am422-reed-switch-security-sensor-surface-mount--4438977

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Pickup points | 22.07.2026 | 1.89 EUR |
| Courier delivery to door | 22.07.2026 | 4.99 EUR |

## Summary description

Magnetic Contact MS-20M AM422 is a surface-mount reed switch security sensor used to detect opening of doors or windows. Compact and simple, it consists of a magnet and a contact unit that close/open when the magnet moves away, enabling integration with alarm panels and control systems. Suitable for residential and commercial intrusion detection and perimeter monitoring.

## Long description

Magnetic Contact MS-20M AM422 is a surface-mount reed switch security sensor designed to detect the opening of doors and windows. The device consists of a magnet and a contact unit; when the magnet moves away from the contact unit, the circuit changes state and the sensor signals an opening event. Compact and simple in design, this magnetic contact sensor integrates with alarm panels and control systems for residential and commercial intrusion detection and perimeter monitoring.
Advantages
The sensor offers dependable contact switching with low power requirements and compact dimensions suitable for discreet installation. Its surface-mount format simplifies fitting on a variety of frame and sash profiles without recessed mounting. The reed switch mechanism provides a mechanical, fail-safe means of detecting relative movement between magnet and contact, enabling straightforward wiring to conventional alarm inputs.
Suitable for
Monitoring doors and windows in homes and apartments
Perimeter and access control for offices and small commercial premises
Integration with wired alarm panels, control panels and automation systems
Temporary or retrofit installations where recessed mounting is not possible
Key specifications
Type: Surface-mount reed switch magnetic contact
Operation: Magnet and contact unit that change state on separation
Contact type: Normally closed / normally open switching depending on wiring
Mounting: Surface mounting for frames, sashes or flat surfaces
Power requirements: Passive reed switch (no internal power source required)
Connection: Wired terminals for direct alarm panel input
Dimensions: Compact profile suited for discreet placement
How to use
Mount the contact unit on the fixed frame and align the magnet on the moving sash or door so that the two elements come within the specified gap when closed. Connect the sensor’s wires to the alarm or control panel input following the panel’s wiring scheme for magnetic contacts. Test the alignment and circuit operation by opening and closing the door or window and verifying that the control panel registers the change of state. Ensure secure fastening and protect wiring runs from mechanical damage.
Usage recommendations
Install the sensor where the magnet and contact can remain aligned within the recommended gap; avoid placing the magnet on curved or uneven surfaces that may change alignment. For reliable operation, route and secure connection wires to prevent pulling or water ingress, and perform periodic tests as part of routine security system maintenance.

## FAQ

### How much does the Magnetic Contact MS-20M AM422 sensor cost, and is it available for purchase?

The price is 6.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 17.07.2026 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.

### 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/4438977/15240644_large.webp