Thermal-magnetic circuit breaker with 16kA breaking capacity, C curve tripping, and DX³ auxiliary compatibility for reliable residential and commercial electrical protection
The Legrand DX3 MCB 2P 40A C Curve is a thermal-magnetic circuit breaker designed to protect wiring installations against overloads and short circuits. With a breaking capacity of 16kA at 230V and 10kA at 400V, this device features a C curve tripping characteristic that provides reliable protection for residential and small commercial applications. The breaker is suitable for both control and isolation of electrical installations, and accepts DX³ auxiliaries for enhanced functionality.
This circuit breaker is equipped with two DIN rail clamps for independent removal and offers IP20 protection against solid bodies larger than 12.5mm. The device complies with IEC 60898-1 standards and features current limiting class 3 for maximum limitation of let-through energy. Built-in label holder allows clear circuit identification with on/off indication printed on the handle for easy status recognition.
The DX3 MCB can be supplied by copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar, offering flexible installation options. It accepts DX³ auxiliaries, RCD add-on modules, and accessories for comprehensive system integration. The product is halogen-free and designed with environmental consciousness, complying with substance-restriction requirements.
Key Features
- 16kA breaking capacity at 230V and 10kA at 400V according to IEC 60898-1 standard
- C curve tripping characteristic with 200-400A short-circuit threshold (5In to 10In)
- Accepts DX³ auxiliaries, RCD add-on modules, and comprehensive accessories
- IP20 protection against solid bodies larger than 12.5mm with current limiting class 3
- Flexible supply options: copper cable, prong busbar, fork busbar, or Legrand HX3 plug busbar
- Independent DIN rail removal with top and bottom clamps
- Built-in label holder with on/off indication for easy circuit identification
- Halogen-free design with environmentally conscious manufacturing
- Connectable to aluminum cable with terminal accessory
- Rated for 400V AC with impulse withstand voltage of 4kV
Technical Specifications
| Specification |
Value |
| Product Type | Thermal-Magnetic Circuit Breaker (MCB) |
| Model | DX3 |
| Number of Poles | 2 poles |
| Rated Current | 40 Amperes |
| Release Characteristic | C curve |
| Breaking Capacity at 230V | 16 kA (Icn according to EN 60898) |
| Breaking Capacity at 400V | 10 kA (Icn according to EN 60898) |
| Ultimate Breaking Capacity at 230V | 32 kA (Icu according to IEC 60947-2) |
| Ultimate Breaking Capacity at 400V | 16 kA (Icu according to IEC 60947-2) |
| Rated Voltage | 400V AC |
| Rated Insulation Voltage | 500V |
| Impulse Withstand Voltage | 4 kV |
| Frequency Range | 50-60 Hz |
| Current Limiting Class | Class 3 |
| Short-Circuit Tripping Threshold | 200-400A (5In to 10In) |
| Degree of Protection | IP20 |
| Impact Strength Degree | IK02 |
| Width | 35.4 mm (2 modular spaces) |
| Height | 94.8 mm |
| Built-in Depth | 44 mm |
| Overall Depth | 77.8 mm |
| Connectable Conductor Cross Section (Multi-wired) | 1.5-25 mm² |
| Connectable Conductor Cross Section (Solid-core) | 1.5-35 mm² |
| Connection Type | Screwed terminal |
| Supply Direction | Top or bottom |
| Mounting Method | DIN rail |
| Colour | Grey |
| RAL Number | 7035 |
| Operating Temperature Range | -25°C to +70°C |
| Storage Temperature Range | -40°C to +70°C |
| Pollution Degree | 2 |
| Flush-mounted Installation | Yes |
| Concurrently Switching Neutral | No |
| Additional Equipment Possible | Yes |
| Halogen Free | Yes |
| Explosion-proof | No |
| Label Space/Information Surface | Yes |
| Reference Number | 409206 |
| EAN Code | 3245064092067 |
| Carbon Footprint (Manufacturing Phase) | 1.870 kg CO₂ eq |
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