# Moeller EMR4-A400-1 3 Phase Monitoring Relay - 250V

The **Moeller EMR4-A400-1 3 Phase Unbalance Monitoring Relay** is engineered for robust 3-phase system protection. This relay, essential for industrial automation, safeguards electrical equipment by continuously monitoring for imbalances. Designed to ensure the safe and efficient operation of your machinery, it is a crucial component in any electrical system.

This relay features a maximum voltage rating of 250V and a current rating of 4A AC15 at 220V. It includes one C/O (changeover) contact for precise control, making it suitable for applications where accuracy is paramount. With a wide operating voltage range of AC 380-415V at 50Hz and compliant with VDE 0435 and VDE 0110 standards, the **Moeller EMR4-A400-1** guarantees high-quality performance and safety. Its compact and lightweight design, weighing only 160 grams, ensures easy installation and maintenance. The **3 Phase Monitoring Relay** is a reliable solution for protecting valuable electrical systems.

-   **3-Phase Monitoring**: Detects voltage imbalances to prevent equipment damage.
-   **Changeover Contact**: Provides precise control and reliable switching capabilities.
-   **Wide Voltage Range**: Supports AC 380-415V at 50Hz, versatile for various applications.
-   **Compact Design**: Lightweight and easy to install, saving space and time.
-   **Safety Standards**: Compliant with VDE standards, ensuring high-quality and safe operation.

This **Moeller EMR4-A400-1** is a dependable choice for industrial applications. It is an ideal component to protect your electrical systems from potential damage. Trust in the reliability and performance of this **monitoring relay** to ensure your automation systems operate smoothly and safely. Contact us at [info@ramautomations.com](mailto:info@ramautomations.com).

## Details

- **Price:** 999.0 USD
- **Vendor:** Moeller
- **Type:** Industrial Automation > Relays > Monitoring Relays
- **Tags:** 3 phase monitoring relay, EMR4-A400-1, industrial automation, Moeller, phase imbalance protection, voltage monitoring

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Used | 999.00 USD | In stock |

## Images

- Moeller EMR4-A400-1 3 Phase Monitoring Relay - 250V-Ram Automations

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> Source: [Ram Automations](https://ramautomations.com/products/moeller-emr4-a400-1-relay)
> Updated: 2026-09-18