Professional thermal magnetic circuit breaker with 16A D-curve, 6000A breaking capacity, 4-pole 400V AC design, IP20 finger-safe construction, and DIN rail mounting for comprehensive electrical protection.
The Legrand DX3 MCB 4P 16A D-Curve Circuit Breaker (Reference 408147) is a thermal magnetic circuit-breaker designed to protect wiring installations against overloads and short-circuits. This professional-grade device features a 16A D-curve rating with a 6000A/10kA breaking capacity, making it ideal for residential and small commercial electrical systems. The 4-pole, 400V AC design ensures comprehensive protection across all phases with a 50-60Hz frequency rating.
This circuit breaker incorporates advanced safety features including IP20 finger-safe construction that protects against solid bodies larger than 12.5mm, ensuring safe installation in accessible areas. The device features DIN rail mounting with dual clamps (top and bottom) allowing independent removal while the prong busbar remains in place. The D-curve tripping characteristic provides a short-circuit tripping threshold between 160A and 224A (10-14 times the rated current), offering optimal protection for general-purpose circuits.
The DX3 MCB is engineered for flexible supply options including copper cable, prong busbar (top or bottom), fork busbar (bottom), or Legrand HX3 plug busbar (top) connections. With connectable conductor cross-sections ranging from 1.5-25mm² for multi-wired and 1.5-35mm² for solid-core cables, this breaker accommodates various installation requirements. The device includes a label holder for circuit identification and clear ON/OFF status indication with red and green backgrounds for easy identification.
Key Features
- Thermal magnetic protection with D-curve characteristic for general-purpose circuit protection
- 6000A breaking capacity according to IEC 60898-1 standard with 10kA rated short-circuit breaking capacity at 400V
- 4-pole design for comprehensive 400V AC three-phase system protection with neutral conductor
- IP20 finger-safe construction protecting against solid bodies larger than 12.5mm per IEC/EN 60529
- DIN rail mounting with independent dual clamps enabling removal without disturbing busbar supply
- Flexible supply options including copper cable, prong busbar, fork busbar, or HX3 plug busbar
- Compatible with Legrand DX3 auxiliaries, RCD add-on modules and accessories for extended functionality
- Label holder with clear ON/OFF status indication using red and green backgrounds
- Connectable conductor cross-sections from 1.5-35mm² accommodating various cable types
- Environmentally conscious design complying with substance-restriction requirements and halogen-free materials
Technical Specifications
| Specification |
Value |
| Product Reference | 408147 |
| EAN Code | 3245064081474 |
| Brand | Legrand |
| Series | DX3 |
| Type | Thermal Magnetic Circuit Breaker (MCB) |
| Number of Poles | 4 poles |
| Rated Current | 16 A |
| Release Characteristic | D-Curve |
| Rated Voltage | 400 V AC |
| Rated Insulation Voltage | 500 V |
| Rated Impulse Withstand Voltage | 4 kV |
| Rated Short-Circuit Breaking Capacity (Icn) | 6 kA at 400V |
| Rated Short-Circuit Breaking Capacity (Icu) | 10 kA at 400V / 25 kA at 230V |
| Frequency | 50-60 Hz |
| Degree of Protection (IP) | IP20 |
| Degree of Impact Strength | IK02 |
| Ambient Operating Temperature | -25°C to +70°C |
| Storage Temperature | -40°C to +70°C |
| Connectable Conductor Cross-Section (Multi-wired) | 1.5-25 mm² |
| Connectable Conductor Cross-Section (Solid-core) | 1.5-35 mm² |
| Connection Type | Screwed Terminal |
| Width | 70.8 mm |
| Height | 94.8 mm |
| Depth (Built-in) | 44 mm / 77.8 mm (total) |
| Modular Width | 4 spaces |
| Mounting Method | DIN Rail |
| Color | Grey |
| RAL Number | 7035 |
| Material Composition | Halogen-free |
| Pollution Degree | 2 |
| Supply Direction | Top or Bottom |
| Neutral Conductor Switching | Yes - Concurrently switching |
| Flush-Mounted Installation | Yes |
| Additional Equipment Compatible | Yes |
| Explosion-Proof | No |
| Carbon Footprint (Manufacturing) | 3.658 kg CO2 eq. |
| Tripping Threshold (Short-Circuit) | 160A-224A (10-14 x rated current) |
| Supply Options | Copper cable, prong busbar (top/bottom), fork busbar (bottom), HX3 plug busbar (top) |
| Standards Compliance | IEC 60898-1, IEC 60947-2, IEC/EN 60529 |
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