Single-pole 40A D-curve thermal magnetic circuit-breaker with 6000A breaking capacity, IP20 finger-safe protection, and DIN rail mounting for household and small commercial electrical installations.
The Legrand DX3 MCB 1P 40A Curve D is a thermal magnetic circuit-breaker designed to protect wiring installations against overloads and short-circuits in household and small commercial applications. This single-pole device offers 40A D-curve protection with a breaking capacity of 6000A at 230V, providing reliable and efficient protection for electrical systems. The device features IP20 finger-safe design that prevents accidental contact with live components, making it safe for use in residential environments.
This circuit-breaker is equipped with two DIN rail clamps (top and bottom) allowing independent removal even when the prong busbar is still in place. The device can be supplied by copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar, offering flexible installation options. With a D-curve tripping characteristic between 10In and 14In, it provides excellent protection against short-circuits while minimizing nuisance trips. The label holder enables clear circuit identification with ON/OFF indication printed in red and green backgrounds.
Manufactured to comply with IEC 60898-1 standard for household installations, this MCB includes halogen-free construction and environmentally conscious design. It can be equipped with Legrand DX3 auxiliaries, RCD add-on modules, and various accessories for enhanced functionality. The device supports connectable conductor cross-sections from 1.5-25mm² (multi-wired) and 1.5-35mm² (solid-core), with screwed terminal connections for secure installation.
Key Features
- Breaking capacity of 6000A according to IEC 60898-1 standard for household installations
- D-curve tripping characteristic between 10In and 14In for optimal short-circuit protection
- IP20 finger-safe design prevents accidental contact with live components
- Flexible supply options: copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar
- Independent removal capability with dual DIN rail clamps (top and bottom mounting)
- Clear circuit identification with label holder and ON/OFF indication in red and green
- Compatible with Legrand DX3 auxiliaries, RCD add-on modules, and accessories
- Halogen-free construction with environmentally conscious design
- Screwed terminal connections supporting 1.5-25mm² multi-wired and 1.5-35mm² solid-core conductors
- Operating temperature range -25°C to +70°C for reliable performance in various environments
Technical Specifications
| Specification |
Value |
| Product Type | Thermal Magnetic Circuit-Breaker (MCB) |
| Brand | Legrand |
| Series | DX³ |
| Reference Number | 407975 |
| EAN Code | 3245064079754 |
| Number of Poles | 1 pole (single-pole) |
| Rated Current | 40 A |
| Release Characteristic | D curve (10In to 14In) |
| Rated Voltage | 230 V AC |
| Rated Insulation Voltage | 500 V |
| Rated Impulse Withstand Voltage | 4 kV |
| Breaking Capacity (Icn) | 6000 A at 230V according to EN 60898-1 |
| Breaking Capacity (Icu) | 10000 A at 230V according to IEC 60947-2 |
| Frequency Range | 50-60 Hz |
| Degree of Protection | IP20 (finger-safe) |
| Impact Strength | IK02 |
| Width (in modular spacings) | 1 module |
| Width | 17.8 mm |
| Height | 94.8 mm |
| Depth | 77.8 mm |
| Built-in Depth | 44 mm |
| Color | Grey |
| RAL Number | 7035 |
| Connection Type | Screwed terminal |
| Connectable Conductor Cross Section (Multi-wired) | 1.5-25 mm² |
| Connectable Conductor Cross Section (Solid-core) | 1.5-35 mm² |
| Supply Direction | Top or bottom |
| Mounting Method | DIN rail |
| Flush-mounted Installation | Yes |
| Concurrently Switching Neutral | No |
| Pollution Degree | 2 |
| Additional Equipment Possible | Yes (DX3 auxiliaries, RCD add-on modules, accessories) |
| Operating Temperature Range | -25°C to +70°C |
| Storage Temperature Range | -40°C to +70°C |
| Halogen Free | Yes |
| Explosion-proof | No |
| Label Space | Yes |
| Carbon Footprint (Manufacturing Phase) | 0.992 kg CO₂ eq. |
| Compliance Standards | IEC 60898-1, IEC 60947-2, IEC/EN 60529 |
| DIN Rail Clamps | Dual clamps (top and bottom) for independent removal |
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