Thermal magnetic circuit-breaker with 10kA breaking capacity, 4-pole 50A configuration, B-curve characteristic, and IP20 finger-safe design for residential and small commercial electrical installations.
The Legrand TX3 MCB (Miniature Circuit Breaker) is a thermal magnetic circuit-breaker designed to protect wiring installations against overloads and short-circuits. With a 10kA breaking capacity at 400V, this 4-pole 50A device features a B-curve characteristic and IP20 finger-safe design, making it ideal for controlling and isolating electrical circuits in residential and small commercial applications. The device complies with IEC 60898-1 standard for household installations and offers maximum energy limitation with class 3 current limiting capability.
This circuit breaker features advanced protection mechanisms including a tripping threshold for short-circuits between 150A and 250A (B curve between 3 In and 5 In). It can be supplied through copper cable, prong busbar (top or bottom side), or fork busbar (bottom side), providing flexible installation options. The MCB is equipped with a special DIN rail clamp on the bottom side, allowing independent removal when the fork busbar supplying the row remains in place. The device includes a label holder for clear circuit identification and On/Off indication printed on the handle with red and green backgrounds for easy status identification.
The TX3 MCB is protected against solid bodies larger than 12.5mm (fingerproof) according to IEC/EN 60529 standard and can be equipped with Legrand DX3 auxiliaries and accessories. It is halogen-free and designed in an environmentally conscious process, complying with substance-restriction requirements. The device can be connected to aluminum cable with Legrand DX3 terminal accessory, making it versatile for various installation scenarios.
Key Features
- 10kA breaking capacity at 400V according to IEC 60898-1 standard
- B-curve characteristic with short-circuit tripping threshold between 150A and 250A
- IP20 finger-safe protection against solid bodies larger than 12.5mm
- Class 3 energy limitation for maximum protection and current limiting capability
- Flexible supply options via copper cable, prong busbar, or fork busbar
- Special DIN rail clamp allowing independent removal without disturbing busbar
- Label holder for clear circuit identification and status indication
- Compatible with Legrand DX3 auxiliaries and accessories
- Halogen-free and environmentally conscious design
- Suitable for aluminum cable connections with DX3 terminal accessory
Technical Specifications
| Specification |
Value |
| Rated Current | 50A |
| Number of Poles | 4 poles (3 protected poles + neutral) |
| Breaking Capacity | 10kA at 400V / 16kA at 230V according to EN 60898 |
| Release Characteristic | B curve (3 In to 5 In tripping range) |
| Rated Voltage | 400V AC |
| Rated Insulation Voltage | 500V |
| Rated Impulse Withstand Voltage | 4kV |
| Current Limiting Class | Class 3 |
| Degree of Protection | IP20 (fingerproof) |
| Impact Strength | IK02 |
| Width | 70.8mm (4 modular spacings) |
| Height | 88mm |
| Depth | 77.8mm / 44mm built-in depth |
| Color | Grey (RAL 7035) |
| Connection Type | Screwed terminal, Busbar and cable |
| Mounting Method | DIN rail |
| Frequency | 50-60 Hz |
| Nominal Voltage Range | 240-415V |
| Supply Direction | Top or bottom |
| Pollution Degree | 2 |
| Storage Temperature Range | -40°C to +70°C |
| Halogen Free | Yes |
| Concurrent Neutral Switching | Yes |
| Additional Equipment | Compatible with Legrand DX3 auxiliaries |
| Reference Number | 404159 |
| EAN Code | 3414970393357 |
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