Legrand DX3 thermal magnetic circuit breaker with 2P, 2A B-curve rating, 6kA breaking capacity, IP20 fingerproof design, and DIN rail mounting for residential and commercial electrical protection.
The Legrand DX3 MCB 2P 2A B-Curve Circuit Breaker (Reference 407503) is a thermal magnetic circuit-breaker designed to protect wiring installations against overloads and short-circuits. This device features a 2-pole configuration with a 2A rated current and B-curve tripping characteristic, providing reliable protection for residential and small commercial applications. With a breaking capacity of 6kA according to IEC 60898-1 standard and 10kA according to IEC 60947-2 at 400V, this circuit breaker ensures comprehensive electrical safety. The fingerproof IP20 design prevents accidental contact with live components, making it suitable for installation in accessible areas.
This MCB is engineered for DIN rail mounting and can be supplied via copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar connections. The device features energy limitation class 3 according to IEC 60898-1 standard, ensuring maximum protection against let-through energy during fault conditions. It is compatible with Legrand DX3 auxiliaries, RCD add-on modules, and various accessories, allowing for flexible system configuration. The circuit breaker can also be connected to aluminum cable with the appropriate terminal accessory, expanding installation flexibility.
The product complies with all substance-restriction requirements and has been designed through an environmentally conscious manufacturing process. It includes a label holder for clear circuit identification and features ON/OFF indication on the handle with red and green backgrounds for easy status identification. With dimensions of 35.4mm width and 77.8mm depth, this 2-module device fits seamlessly into standard DIN rail installations. The ambient operating temperature range of -25°C to 70°C ensures reliable performance in diverse environmental conditions.
Key Features
- Thermal magnetic protection against overloads and short-circuits with B-curve tripping characteristic
- Breaking capacity of 6kA per IEC 60898-1 and 10kA per IEC 60947-2 at 400V for comprehensive fault protection
- IP20 fingerproof design preventing accidental contact with live components in accessible installations
- DIN rail mounting with dual clamps allowing independent removal without disturbing busbar supply
- Energy limitation class 3 ensuring maximum protection against let-through energy during fault conditions
- Compatible with Legrand DX3 auxiliaries, RCD add-on modules, and comprehensive accessory range
- Label holder with clear circuit identification and ON/OFF indication for easy status recognition
- Connectable to copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar systems
- Aluminum cable connection capability with appropriate terminal accessories for installation flexibility
- Environmentally conscious design complying with all substance-restriction requirements and RoHS directive
Technical Specifications
| Specification |
Value |
| Product Reference | 407503 |
| EAN Code | 3245064075039 |
| Manufacturer | Legrand |
| Product Series | DX³ |
| Number of Poles | 2 poles (2P) |
| Rated Current | 2 Amperes |
| Trip Characteristic | B-Curve (3-5 In) |
| Rated Voltage | 400V AC |
| Rated Insulation Voltage | 500V |
| Rated Impulse Withstand Voltage | 4 kV |
| Breaking Capacity IEC 60898 | 6 kA at 400V |
| Breaking Capacity IEC 60947-2 | 10 kA at 400V, 25 kA at 230V |
| Current Limiting Class | Class 3 |
| Degree of Protection | IP20 (Fingerproof) |
| Mounting Method | DIN Rail |
| Module Width | 2 modular spacings (35.4 mm) |
| Built-in Depth | 44 mm |
| Total Height | 94.8 mm |
| Total Depth | 77.8 mm |
| 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 |
| Ambient Operating Temperature | -25°C to +70°C |
| Storage Temperature | -40°C to +70°C |
| Frequency | 50-60 Hz |
| Pollution Degree | 2 |
| Impact Strength Rating | IK02 |
| Colour | Grey |
| RAL Number | 7035 |
| Halogen Free | Yes |
| Additional Equipment Possible | Yes (RCD modules and accessories) |
| Flush-mounted Installation | Yes |
| Label Space | Yes (with information surface) |
| Carbon Footprint (Manufacturing) | 1.958 kg CO₂ eq. |
| RoHS Compliance | Yes |
| REACH Compliance | Yes |
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