Circuit breaker Legrand Tx3 C25A 3‑pole 6 kA 3‑module (MPN 403547)

Legrand Tx3 C25A is a three‑pole miniature circuit breaker with a C‑characteristic and a rated current of 25 A, designed for DIN‑rail mounting in residential and commercial electrical distribution boards. The device provides thermal‑magnetic protection for three‑phase circuits, offering overload and short‑circuit interruption with a making/breaking capacity suitable for typical building installations. Its compact 3‑module width helps save space in distribution panels while enabling coordinated protection of motors and general loads.

Advantages

The breaker combines a clear trip characteristic with a compact footprint, facilitating straightforward integration into standard DIN‑rail systems. Its C‑type tripping curve allows selective operation for inrush currents from motors and transformers while maintaining reliable protection against sustained overloads and short circuits. The product meets common industry performance expectations for making and breaking capacity and is compatible with accessories and busbar systems used in modern installations.

Suitable for

• Protection of three‑phase branch circuits in residential and commercial distribution boards
• Motor protection for small motors with moderate starting currents
• General load protection for lighting, sockets and HVAC subcircuits
• Retrofit or new build installations using standard DIN‑rail enclosures

Key specifications

• Poles: 3‑pole thermal‑magnetic protection
• Rated current: 25 A
• Tripping characteristic: C‑curve
• Breaking capacity: 6 kA
• Width: 3 modules (standard modular width)
• Mounting: DIN‑rail (standard TH35 rail)
• Application: three‑phase circuits, motor and general load protection

How to use

Install the breaker on a standard DIN‑rail inside a compliant distribution board, ensuring correct orientation and firm mechanical engagement. Connect supply and load conductors to the appropriate terminals, observing conductor size and tightening torque recommended by local regulations and the installation practice for Legrand modular devices. Verify correct upstream and downstream device coordination, then switch the breaker to the ON position. Test the circuit after installation to confirm proper operation and that the breaker trips under fault conditions.

Usage recommendations

Use this three‑pole breaker where coordinated protection of three‑phase circuits is required. Confirm conductor cross‑sections, torque settings and upstream fault‑limiting measures to ensure the 6 kA breaking capacity is adequate for the installation. For motor loads, evaluate starting currents against the C‑curve characteristic and, if necessary, consider additional motor protection or selective devices for improved discrimination.