Professional-grade 4-pole 40A circuit breaker with 36kA breaking capacity, C curve protection, and IP20 finger-safe terminals for reliable electrical circuit control and isolation.
The Legrand DX³ four-pole modular thermal-magnetic circuit breaker is a professional-grade electrical protection device designed for control, protection, and isolation of electrical circuits. This advanced circuit breaker features a 36kA breaking capacity at 400V~ with C curve tripping characteristics, making it ideal for residential and small commercial applications. The device incorporates visible breaking functionality for enhanced control and safety, with IP20 finger-safe terminals ensuring protection against solid bodies larger than 12.5mm. Built with environmentally conscious design principles, this circuit breaker complies with all substance-restriction requirements and modern electrical standards.
The DX³ circuit breaker offers exceptional reliability with a rated current of 40A and rated voltage of 400V, providing superior short-circuit breaking capacity of 72kA at 230V and 36kA at 400V according to IEC 60947-2 standards. The device features a red/green mechanical indicator displaying the open or closed status of contacts, along with a convenient label holder for clear circuit identification. With a built-in depth of 47mm and width of 106.8mm, this compact modular design fits seamlessly into standard DIN rail installations. The thermal-magnetic protection mechanism provides precise tripping between 200A and 400A for short circuits (C curve between 5In and 10In), ensuring optimal circuit protection.
This versatile circuit breaker is compatible with Legrand DX3 auxiliaries, RCD add-on modules, and various accessories, offering flexible configuration options for diverse electrical installations. The device supports both copper and aluminum cable connections (with terminal accessory), operates across 50-60Hz frequencies, and maintains performance in ambient temperatures ranging from -25°C to 70°C. Professional installation by qualified electricians is recommended to ensure safety and compliance with local electrical codes and regulations.
Key Features
- 36kA breaking capacity at 400V with C curve tripping characteristics for superior short-circuit protection
- Visible breaking mechanism with red/green mechanical indicator for clear status display and enhanced safety
- IP20 finger-safe terminals protecting against solid bodies larger than 12.5mm per IEC/EN 60529 standard
- Compatible with Legrand DX3 auxiliaries, RCD add-on modules, and comprehensive accessory range
- Compact modular design (106.8mm width, 47mm depth) for seamless DIN rail installation
- Supports both copper and aluminum cable connections with optional terminal accessories
- Operates across 50-60Hz frequencies with ambient temperature range from -25°C to 70°C
- Environmentally conscious design complying with substance-restriction requirements and RoHS standards
- Concurrently switching neutral conductor for enhanced circuit protection and safety
- Label holder for clear, visible circuit identification and convenient maintenance
Technical Specifications
| Specification |
Value |
| Product Name | MCB DX3 4 Pole 40A Curve C |
| Manufacturer | Legrand |
| Reference Number | 410038 |
| EAN Code | 3245064100380 |
| Number of Poles | 4 poles |
| Rated Current | 40 A |
| Rated Voltage | 400 V AC |
| Rated Insulation Voltage | 500 V |
| Rated Impulse Withstand Voltage | 6 kV |
| Release Characteristic | C Curve |
| Tripping Threshold | 200A to 400A (C curve between 5In and 10In) |
| Breaking Capacity at 230V | 72 kA |
| Breaking Capacity at 400V | 36 kA |
| Frequency Range | 50-60 Hz |
| Degree of Protection | IP20 (Finger-safe) |
| Impact Strength Rating | IK02 |
| Built-in Depth | 47 mm |
| Width | 106.8 mm |
| Height | 127.5 mm |
| Depth Overall | 79.2 mm |
| Width in Modular Spacings | 6 spacings |
| Operating Temperature Range | -25°C to 70°C |
| Storage Temperature Range | -40°C to 70°C |
| Nominal Voltage Range | 360-440 V |
| Connectable Conductor Cross Section (Solid-core) | 1.5-50 mm² |
| Connectable Conductor Cross Section (Multi-wired) | 1.5-35 mm² |
| Connection Type | Screwed terminal, Cable |
| Electric Supply Direction | By the top or bottom |
| Mounting Method | DIN rail |
| Flush-mounted Installation | Yes |
| Concurrently Switching Neutral Conductor | Yes |
| Additional Equipment Possible | Yes |
| Pollution Degree | 3 |
| Colour | Grey |
| RAL Number | 7035 |
| Halogen Free | Yes |
| Label Space/Information Surface | Yes |
| Explosion-proof | No |
| Carbon Footprint (Manufacturing) | 6.993 kg CO2 eq. |
| Compliance Standards | IEC 60947-2, IEC/EN 60529, RoHS Directive |
| Environmental Compliance | Substance-restriction compliant, RoHS certified |
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