# LS AU-4M 3a1b Front Auxiliary Contact Block 3NO 1NC

**URL:** https://aio.lv/en/product--ls-au-4m-3a1b--12450067
**Data updated:** 2026-05-18 02:45 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** LS
**Manufacturer code:** AU-4M 3a1b
**EAN:** 8809587680672
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 16.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 14.04 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ls-au-4m-3a1b--12450067

## 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 3a1b is a front-mounted auxiliary contact block designed for industrial switching applications. It features a configuration of 3 normally open (NO) and 1 normally closed (NC) contacts. This module is engineered for reliable integration with compatible LS contactors, providing essential feedback and control signaling in electrical automation systems.

## Long description

The LS AU-4M 3a1b front auxiliary contact block is a precision-engineered component designed to expand the switching capabilities of compatible LS contactors. This module provides reliable feedback and control signaling, making it an essential element for industrial automation and electrical control systems. With its robust construction and seamless integration, it ensures consistent performance in demanding environments where precise contact state monitoring is required.
Advantages
This auxiliary contact block offers a compact, front-mounted design that saves valuable space within electrical cabinets and control panels. By providing three normally open and one normally closed contact, it allows for versatile circuit configurations and complex control logic. The high-quality materials used in its construction ensure long-term durability and reliable electrical conductivity, minimizing the risk of signal failure during operation.
Suitable for
Industrial automation control systems
Motor starter assemblies
Electrical interlocking circuits
Feedback signaling for PLC inputs
Monitoring contactor status in power distribution panels
When it may not be suitable
This contact block is specifically designed for use with compatible LS contactors and may not be physically or electrically compatible with contactors from other manufacturers. It is not intended for high-power switching applications and should only be used for control-level signaling.
Key specifications
Contact configuration: 3 normally open (NO) and 1 normally closed (NC)
Mounting type: Front-mounted
Compatibility: Designed for specific LS contactor series
Application: Auxiliary control and signaling
How to use
To install the contact block, ensure that the power supply to the main contactor is completely disconnected. Align the module with the front mounting interface of the compatible LS contactor and press firmly until it clicks into place. Once secured, connect the control wiring to the designated terminals according to your circuit diagram. Verify the mechanical engagement and perform a continuity test before re-energizing the system.
What to consider before purchase
Verify compatibility with your specific LS contactor model
Ensure the contact configuration meets your control circuit requirements
Check available space on the front of the contactor for mounting
Usage recommendations
Always ensure that the auxiliary contact block is installed by a qualified professional in accordance with local electrical regulations. Regularly inspect the terminal connections for tightness and ensure the module is free from dust and debris to maintain optimal signal integrity.

## FAQ

### How much does the LS AU-4M 3a1b Front Auxiliary Contact Block cost, and is it available for purchase?

The price is 16.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 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/12450067/68752852_large.webp