# ABB E4S 4000 PR121-P-LSI Circuit Breaker 1SDA056785R1 In4000A 3 Pole

Introducing the robust **ABB E4S 4000 PR121-P-LSI**, a high-performance circuit breaker designed for demanding industrial automation applications. This essential component, identified by **part number 1SDA056785R1**, ensures reliable power distribution and protection within critical systems. Its advanced design offers superior safety and operational continuity, making it a trusted choice for safeguarding sensitive electrical equipment. The **ABB E4S 4000 PR121-P-LSI** is engineered for efficiency and durability, providing peace of mind for complex industrial environments. It is a key element for control systems requiring precise current management and fault interruption.

Engineered with precision for industrial use, the **ABB E4S 4000 PR121-P-LSI** features an impressive **In4000A** current rating and a **3-pole** configuration, making it suitable for substantial electrical loads. This circuit breaker integrates seamlessly into advanced automation setups, offering robust protection against overloads and short circuits. Its sophisticated LSI trip unit allows for adjustable settings, enhancing its adaptability to various operational requirements and ensuring optimal system performance. For professionals seeking dependable circuit protection in harsh industrial settings, this ABB breaker provides the necessary reliability and advanced functionality. It is designed to meet the stringent demands of modern control systems and power management.

-   **High Performance**: Delivers exceptional reliability for industrial automation.
-   **Superior Protection**: Offers advanced overcurrent and short-circuit fault interruption.
-   **Durable Construction**: Built to withstand demanding operational environments.
-   **Flexible Application**: Suitable for various industrial power distribution needs.
-   **ABB Quality**: Represents trusted engineering and manufacturing excellence.

## Specifications

**Brand** ABB  
**Model** E4S 4000 PR121-P-LSI  
**Part Number** 1SDA056785R1  
**Current Rating** In4000A  
**Poles** 3  
**Trip Unit Type** LSI

Ensure your industrial automation systems are powered with the best. The **ABB E4S 4000 PR121-P-LSI** circuit breaker stands as a testament to ABB's commitment to quality and innovation. Trust in this dependable solution for your critical power protection needs. Explore the capabilities of this advanced circuit breaker for your next project.

## Details

- **Price:** 999.0 USD
- **Vendor:** ABB
- **Type:** Electrical Equipment > Circuit Breakers > Industrial Circuit Breakers
- **Tags:** 1SDA056785R1, 3 pole circuit breaker, ABB circuit breaker, ABB E4S 4000 PR121-P-LSI, ABB electrical components, control systems, In4000A circuit breaker, industrial automation, power protection, Ram Automations

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 999.00 USD | In stock |

## Images

- ABB E4S 4000 PR121-P-LSI Circuit Breaker 1SDA056785R1 In4000A 3 Pole-Ram Automations

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> Source: [Ram Automations](https://ramautomations.com/products/abb-e4s-4000-pr121-p-lsi-1sda056785r1)
> Updated: 2026-09-21