# LSiS TS400N FMU Molded Case Circuit Breaker 400A 3P 50kA

**URL:** https://aio.lv/en/product--lsis-ts400n-fmu-400a-3p--12469206
**Data updated:** 2026-05-18 09:41 (EEST)
**Category:** Power Sockets
**Manufacturer:** LSiS
**Manufacturer code:** TS400N FMU 400A 3P
**EAN:** 8809513490276
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 616.99 €
**Prices and availability valid until:** 2026-07-24 23:59
**Price without VAT (21%):** 509.91 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lsis-ts400n-fmu-400a-3p--12469206

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The LSiS TS400N FMU is a complete 3-pole molded case circuit breaker designed for reliable electrical protection. With a rated current of 400A and a breaking capacity of 50kA, this device is suitable for industrial and commercial power distribution systems. It features an FMU thermal-magnetic trip unit, ensuring effective overload and short-circuit protection for electrical circuits and equipment.

## Long description

The LSiS TS400N FMU is a robust 3-pole molded case circuit breaker engineered to provide dependable electrical protection in demanding environments. With a rated current of 400A and a high breaking capacity of 50kA, this device is specifically designed to manage power distribution in industrial and commercial settings. It utilizes an integrated thermal-magnetic trip unit, which offers precise monitoring and rapid response to overloads and short-circuit events, thereby safeguarding critical electrical infrastructure and connected equipment.
Advantages
This circuit breaker stands out due to its high-performance thermal-magnetic trip mechanism that ensures consistent reliability under varying load conditions. Its compact molded case design allows for efficient space utilization within electrical panels while maintaining high structural integrity. The 50kA breaking capacity provides a significant safety margin, effectively interrupting high fault currents to prevent damage to downstream components. Furthermore, the LSiS TS400N FMU is built for longevity and ease of integration into standard power distribution architectures, making it a dependable choice for professionals seeking consistent circuit protection.
Suitable for
Industrial power distribution systems
Commercial building electrical panels
Protection of heavy-duty machinery and motors
Main distribution boards in manufacturing facilities
When it may not be suitable
This device is not intended for residential applications where lower current ratings are standard. It is also not suitable for environments requiring specialized electronic trip units with advanced communication or monitoring features, as this model relies on a traditional thermal-magnetic mechanism.
Key specifications
Rated current: 400A
Number of poles: 3
Breaking capacity: 50kA
Trip unit type: Thermal-magnetic (FMU)
Design: Molded case circuit breaker
How to use
Installation should be performed by a qualified electrician in accordance with local electrical codes and safety regulations. The breaker is designed for mounting within a compatible distribution board or enclosure. Ensure that all cable connections are tightened to the manufacturer's specified torque settings to prevent overheating. Once installed, the device can be manually operated using the front-facing toggle handle to switch the circuit on or off. In the event of a trip, the handle will move to a neutral position, requiring a manual reset after the fault has been identified and cleared.
What to consider before purchase
Verify that the 400A rating matches your system load requirements
Ensure the 50kA breaking capacity is sufficient for your installation's prospective fault current
Check the physical dimensions to ensure compatibility with your existing panel space
Confirm that the 3-pole configuration aligns with your electrical supply type
Usage recommendations
Regular inspection of the terminal connections and the operational handle is recommended to ensure long-term performance. Avoid exposing the device to extreme moisture or corrosive environments to maintain the integrity of the internal trip mechanism.

## FAQ

### How much does the LSiS TS400N FMU 400A 3P Circuit Breaker cost, and is it available for purchase?

The price is 616.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 14.07.2026 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, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can LSiS TS400N FMU 400A 3P Circuit Breaker be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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

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