# LSiS MMS-FX 1a1b Front-Mounted Auxiliary Contact Block 1NO+1NC

**URL:** https://aio.lv/en/product--lsis-mms-fx-1a1b--12448694
**Data updated:** 2026-05-18 02:51 (EEST)
**Category:** Home & DIY Accessories
**Manufacturer:** LSiS
**Manufacturer code:** MMS-FX 1a1b
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 12.49 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 10.32 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lsis-mms-fx-1a1b--12448694

## 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 LSiS MMS-FX 1a1b is a front-mounted auxiliary contact block designed for use with motor protection circuit breakers. It features a 1NO (normally open) and 1NC (normally closed) configuration, providing reliable status signaling and control integration. This compact accessory is essential for expanding the functionality of electrical switchgear systems in industrial and commercial applications.

## Long description

The LSiS MMS-FX 1a1b is a front-mounted auxiliary contact block specifically engineered to enhance the operational capabilities of motor protection circuit breakers. This device provides a reliable interface for status monitoring and control, featuring a 1NO (normally open) and 1NC (normally closed) contact configuration. Its compact design allows for seamless integration into existing electrical switchgear setups, ensuring precise feedback on the operational state of the connected circuit breaker.
Advantages
This auxiliary contact block offers a robust solution for industrial and commercial electrical systems by providing clear and immediate status signaling. The front-mounted design facilitates quick and easy installation without requiring additional side space, making it ideal for compact control panels. Its durable construction ensures consistent performance and long-term reliability in demanding environments, while the 1NO+1NC configuration provides versatile options for both monitoring and interlocking applications.
Suitable for
Status signaling of motor protection circuit breakers
Integration into automated control systems
Remote monitoring of electrical switchgear
Safety interlocking circuits in industrial machinery
When it may not be suitable
This auxiliary contact block is designed exclusively for specific LSiS motor protection circuit breakers and may not be compatible with other brands or different series of circuit breakers. It is not intended for use in high-power switching applications where the current exceeds the rated capacity of the auxiliary contacts.
Key specifications
Contact configuration: 1NO (Normally Open) + 1NC (Normally Closed)
Mounting type: Front-mounted
Compatibility: LSiS motor protection circuit breakers
Function: Status indication and control feedback
How to use
To install the LSiS MMS-FX 1a1b, ensure that the main power supply to the motor protection circuit breaker is disconnected. Align the auxiliary contact block with the designated front mounting interface on the circuit breaker housing. Press the unit firmly until it clicks into place, ensuring a secure mechanical and electrical connection. Once installed, connect the necessary control wires to the terminal points according to your wiring diagram, then verify the operation by manually toggling the circuit breaker.
What to consider before purchase
Verify compatibility with your specific LSiS circuit breaker model
Ensure the control voltage and current requirements match your system specifications
Confirm available space on the front of the circuit breaker for mounting
Usage recommendations
Always perform a functional test after installation to ensure that the auxiliary contacts correctly reflect the position of the main circuit breaker contacts. Regularly inspect the terminal connections for tightness to maintain reliable signal transmission.

## FAQ

### How much does the LSiS MMS-FX 1a1b Auxiliary Contact Block cost, and is it available for purchase?

The price is 12.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 265 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 LSiS 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 LSiS 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/12448694/68751621_large.webp