Legrand DX3 modular bipolar circuit breaker with 40A capacity, 25kA breaking capacity at 400V, C-curve protection, IP20 finger-safe design, and DIN-rail mounting for reliable residential and commercial electrical protection.
The Legrand DX3 MCB is a modular bipolar thermal-magnetic circuit breaker designed for residential and small commercial electrical installations. This device delivers exceptional 25kA breaking capacity at 400V with reliable 40A C-curve protection, making it ideal for general purpose circuits with moderate inrush currents. The fully visible breaking mechanism provides clear confirmation of circuit status, while the IP20 finger-safe design ensures protection against accidental contact with live parts.
Features a red/green mechanical indicator that clearly displays the open or closed status of the contacts, along with a convenient label holder for circuit identification. The DX3 breaker is equipped with a DIN-rail mounting system for quick and secure installation in distribution panels. With its 44mm built-in depth and 3-module width, it integrates seamlessly into standard electrical enclosures. The device operates reliably across a temperature range of -25°C to +70°C and is compatible with both copper and aluminum cables through optional accessories.
This circuit breaker complies with IEC 60947-2 standards and incorporates environmentally conscious design principles including halogen-free materials. It can be equipped with Legrand DX3 auxiliaries, RCD add-on modules, and various accessories to expand functionality. The product is manufactured with substance-restriction compliance and represents Legrand's commitment to safety, reliability, and environmental responsibility in electrical distribution systems.
Key Features
- 25kA breaking capacity at 400V with IEC 60947-2 compliance
- 40A rated current with C-curve tripping characteristic (5In to 10In)
- IP20 finger-safe protection against solid bodies larger than 12.5mm
- Red/green mechanical indicator for clear open/closed status display
- DIN-rail mounting with 3-module width and 44mm built-in depth
- Fully visible breaking mechanism for circuit status confirmation
- Compatible with Legrand DX3 auxiliaries and RCD add-on modules
- Halogen-free and environmentally conscious design
- Operates reliably from -25°C to +70°C ambient temperature
- Accepts both copper and aluminum cables with optional accessories
Technical Specifications
| Specification |
Value |
| Product Reference | 409772 |
| EAN Code | 3245064097727 |
| Brand | Legrand |
| Series | DX³ |
| Type | Modular Bipolar Thermal-Magnetic Circuit Breaker |
| Number of Poles | 2 poles |
| Rated Current | 40 A |
| Rated Voltage | 400 V AC |
| Rated Insulation Voltage | 500 V |
| Rated Impulse Withstand Voltage | 6 kV |
| Breaking Capacity at 230V | 50 kA |
| Breaking Capacity at 400V | 25 kA |
| Tripping Characteristic | C-curve (200A-400A, 5In-10In) |
| Frequency | 50-60 Hz |
| Degree of Protection | IP20 (Finger-safe) |
| Degree of Impact Strength | IK02 |
| Built-in Depth | 44 mm |
| Width in Modular Spacings | 3 modules |
| Actual Width | 53.4 mm |
| Height | 127.5 mm |
| Overall Depth | 79.2 mm |
| Color | Grey (RAL 7035) |
| Mounting Method | DIN Rail |
| Connection Type | Screwed Terminal |
| Supply Direction | Top or Bottom |
| Solid-core Conductor Cross Section | 1.5-50 mm² |
| Multi-wired Conductor Cross Section | 1.5-35 mm² |
| Operating Temperature Range | -25°C to +70°C |
| Storage Temperature Range | -40°C to +70°C |
| Nominal Voltage Range | 360-440 V |
| Pollution Degree | 3 |
| Halogen Free | Yes |
| Additional Equipment Possible | Yes |
| Flush-mounted Installation | Yes |
| Concurrently Switching Neutral | No |
| Explosion-proof | No |
| Label Space Available | Yes |
| Mechanical Indicator | Red/Green status display |
| Carbon Footprint (Manufacturing) | 3.549 kg CO₂ eq. |
| Standards Compliance | IEC 60947-2, IEC/EN 60529 |
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