# Residual current circuit breaker 4P 40A 0.3A Type AC Legrand P304 (model 411728)

**URL:** https://aio.lv/en/product--legrand-411728--12106487
**Data updated:** 2026-03-20 09:57 (EET)
**Category:** Other goods
**Manufacturer:** Legrand
**Manufacturer code:** 411728
**EAN:** 3245060090128
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

Legrand residual current circuit breaker (RCCB) P304, model 411728, 4-pole, 40 A rated current, 0.3 A (300 mA) residual trip sensitivity, Type AC. Designed to detect and disconnect alternating current leakage faults to protect people and equipment. Suitable for distribution boards in residential, commercial and light industrial installations requiring AC-only earth-leakage protection.

## Long description

Legrand residual current circuit breaker P304 (4P, 40 A, 0.3 A sensitivity, Type AC) is intended to detect alternating-current earth-leakage faults and interrupt supply to reduce risk to people and equipment. The device is designed for installation in distribution boards where AC-only residual current protection is required, providing coordinated disconnection of all four poles for TN, TT and IT system arrangements where AC leakage detection is appropriate.
Advantages
The four-pole configuration ensures simultaneous isolation of all live conductors and neutral, supporting safe maintenance and fault clearing. The 40 A rated current matches common branch and small main circuits while the 0.3 A (300 mA) trip sensitivity gives reliable earth-fault detection for protection against fire and major leakage currents. Type AC detection focuses on alternating sinusoidal leakage currents, ensuring accurate tripping for typical AC fault conditions. The compact form factor and mounting compatibility make it suitable for standard DIN rail distribution panels.
Suitable for
 Residential and apartment building distribution boards requiring four-pole AC-only RCCB protection
 Commercial small-to-medium installations with balanced three-phase loads and neutral
 Light industrial environments where AC leakage detection at 300 mA sensitivity is required
Key specifications
 Poles: 4-pole (simultaneous disconnection of all phases and neutral)
 Rated current: 40 A
 Residual operating current (trip sensitivity): 0.3 A (300 mA)
 Type: AC (responds to AC sinusoidal residual currents)
 Mounting: DIN-rail compatible enclosure for standard distribution panels
 Application: Fixed installation for earth-leakage protection of circuits
How to use
Install the RCCB in a suitable distribution board on a standard DIN rail and connect the incoming supply conductors to the line side and outgoing circuit conductors to the load side following the manufacturer’s wiring diagram. Ensure the four poles are connected to the corresponding phases and neutral conductor. Verify the device is accessible for testing and tripping. After wiring, perform an insulation and continuity check of the installation and operate the test button, if provided, to confirm correct trip operation before energizing the protected circuits.
Usage recommendations
Use this Type AC RCCB where detection of alternating residual currents is sufficient; it is not intended for detecting pulsating DC or filtered faults (select Type A or Type B devices for those applications). Ensure the rated residual current of 300 mA matches the protection objective (fire and major leakage protection rather than personal protection at lower sensitivities). Regularly test the device according to local regulations and manufacturer guidance to confirm reliable operation.

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### What is the warranty period?

All Legrand 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 Legrand 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

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