# LS AU-4M 4b Front Auxiliary Contact Block, 4NO

**URL:** https://aio.lv/en/product--ls-au-4m-4b--12468545
**Data updated:** 2026-05-18 09:43 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** LS
**Manufacturer code:** AU-4M 4b
**EAN:** 8809587680719
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 15.99 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 13.21 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ls-au-4m-4b--12468545

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

The LS AU-4M 4b is a front-mounted auxiliary contact block designed for integration with LS contactors. It features 4 normally open (NO) contacts, providing reliable signal switching for control and monitoring circuits. This compact accessory is essential for expanding the functionality of electrical switchgear systems, ensuring precise feedback and automation in industrial and commercial power distribution applications.

## Long description

The LS AU-4M 4b is a front-mounted auxiliary contact block specifically engineered for seamless integration with LS contactors. This component provides four normally open (NO) contacts, which are essential for expanding the control and monitoring capabilities of electrical switchgear systems. Designed for reliability, this block ensures precise signal switching in various industrial and commercial power distribution environments, facilitating effective automation and feedback loops.
Advantages
The primary benefit of this auxiliary contact block is its compact, front-mounting design, which allows for easy installation without increasing the footprint of the main contactor. By providing four additional normally open contacts, it significantly enhances the flexibility of control circuits, enabling more complex logic and monitoring configurations. Its robust construction ensures consistent performance and long-term durability in demanding electrical applications.
Suitable for
Industrial automation control panels
Commercial power distribution systems
Motor starter circuits requiring additional feedback
Monitoring and signaling applications
When it may not be suitable
This contact block is designed exclusively for specific LS contactor models and may not be compatible with contactors from other manufacturers or different series. It is not intended for high-power switching applications, as it is strictly an auxiliary device for control signals.
Key specifications
Configuration: 4 Normally Open (NO) contacts
Mounting type: Front-mounted
Compatibility: LS contactors
Function: Auxiliary signal switching
How to use
To install the LS AU-4M 4b, ensure the main power supply to the contactor is disconnected. Align the contact block with the front mounting interface of the compatible LS contactor and press firmly until it clicks into place. Once secured, connect the control wires to the designated terminals according to your circuit diagram. Verify that all connections are tight and that the contactor operates smoothly before restoring power.
What to consider before purchase
Verify compatibility with your specific LS contactor model
Ensure the 4NO configuration meets your control circuit requirements
Check available space in the control cabinet for front-mounted accessories
Usage recommendations
Always perform a functional test of the auxiliary contacts after installation to ensure they trigger correctly in response to the main contactor state. Regularly inspect terminal connections during routine maintenance to prevent signal loss due to vibration or thermal expansion.

## FAQ

### How much does the LS AU-4M 4b Front Auxiliary Contact Block cost, and is it available for purchase?

The price is 15.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 9 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 06.07.2026 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 LS 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 LS 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/12468545/68771154_large.webp