Professional 3-pole circuit breaker with 40A rating, 50kA breaking capacity, C-curve protection, IP20 terminals, and full compatibility with Legrand DX3 accessories for reliable electrical circuit protection.
The Legrand DX3 3-pole modular thermal-magnetic circuit breaker is a professional-grade electrical protection device designed for control, protection, and isolation of electrical circuits in residential and small commercial applications. With a rated current of 40A and a breaking capacity of 50kA at 400V, this circuit breaker provides reliable short-circuit protection with a C-curve tripping characteristic that trips between 5In and 10In (200A to 400A). The device features fully visible breaking contacts, allowing users to clearly see the open or closed status through the red/green mechanical indicator. Its IP20 finger-safe terminals ensure safe operation in standard environments, protecting against solid bodies larger than 12.5mm. The breaker is compatible with Legrand DX3 auxiliaries, RCD add-on modules, and various accessories, making it highly versatile for different installation requirements.
Built to the highest standards of electrical safety and environmental responsibility, this circuit breaker complies with IEC 60947-2 standards and incorporates substance-restriction requirements while being designed through an environmentally conscious manufacturing process. The device operates reliably across a wide temperature range from -25°C to 70°C and supports both solid-core (1.5-50mm²) and multi-wired (1.5-35mm²) conductor connections. The DX3 breaker can be supplied by copper cable from either the top or bottom, offering flexible installation options. Its compact design with a built-in depth of 47mm and width of 80.1mm fits standard DIN rail mounting, making it ideal for modern electrical panels. The halogen-free construction and low carbon footprint of 5.755 kg CO2 equivalent during the manufacturing phase demonstrate Legrand's commitment to sustainable electrical solutions.
With its durable grey construction (RAL 7035), label holder for circuit identification, and advanced thermal-magnetic protection mechanism, the DX3 40A circuit breaker is the perfect choice for professionals seeking reliable electrical protection and isolation. The device includes a rated insulation voltage of 500V, rated impulse withstand voltage of 6kV, and operates at frequencies between 50-60Hz, ensuring compatibility with standard electrical systems worldwide.
Key Features
- Thermal-magnetic protection with C-curve tripping characteristic (200A-400A)
- 50kA breaking capacity at 400V with 100kA capacity at 230V
- Fully visible breaking contacts with red/green mechanical status indicator
- IP20 finger-safe terminals protecting against solid bodies larger than 12.5mm
- Compatible with Legrand DX3 auxiliaries, RCD add-on modules and accessories
- Halogen-free construction with low carbon footprint (5.755 kg CO2 eq)
- Wide operating temperature range from -25°C to 70°C
- Supports both solid-core (1.5-50mm²) and multi-wired (1.5-35mm²) conductors
- Top or bottom copper cable supply options for flexible installation
- DIN rail mounting with label holder for circuit identification
Technical Specifications
| Specification |
Value |
| Product Type | Modular Thermal-Magnetic Circuit Breaker |
| Number of Poles | 3 poles (3 protected poles) |
| Rated Current | 40 Amperes |
| Rated Voltage | 400V AC |
| Breaking Capacity at 400V | 50 kA (IEC 60947-2) |
| Breaking Capacity at 230V | 100 kA (IEC 60947-2) |
| Tripping Characteristic | C Curve (5In to 10In / 200A-400A) |
| Rated Insulation Voltage | 500V |
| Rated Impulse Withstand Voltage | 6 kV |
| Protection Degree | IP20 (Finger-safe terminals) |
| Operating Frequency | 50-60 Hz |
| Ambient Temperature (Operating) | -25°C to +70°C |
| Storage Temperature | -40°C to +70°C |
| Built-in Depth | 47 mm |
| Width | 80.1 mm |
| Height | 127.5 mm |
| Depth | 79.2 mm |
| Modular Width | 4.5 modular spacings |
| Impact Strength Degree | IK02 |
| Solid-Core Conductor Range | 1.5-50 mm² |
| Multi-Wired Conductor Range | 1.5-35 mm² |
| Connection Type | Screwed terminal with cable |
| Supply Direction | Top or bottom |
| Mounting Method | DIN rail |
| Flush-Mounted Installation | Yes |
| Colour | Grey (RAL 7035) |
| Halogen Free | Yes |
| Pollution Degree | 3 |
| Carbon Footprint (Manufacturing) | 5.755 kg CO2 eq |
| Reference Number | 410165 |
| EAN Code | 3245064101653 |
| Nominal Voltage Range | 360-440V |
| Concurrently Switching Neutral | No |
| Additional Equipment Possible | Yes (RCD modules and accessories) |
| Label Space | Yes (with label holder) |
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