Circuit breaker Legrand Tx3 B10A 3-pole 6 kA 3M (403400)

Legrand Tx3 B10A 3-pole miniature circuit breaker is a three-module protective device designed for DIN-rail distribution boards. With a B tripping characteristic and a rated current of 10 A, this breaker interrupts fault currents reliably and is intended for protection of circuits in residential and light commercial electrical installations. The device provides a short-circuit breaking capacity up to 6 kA and a compact three-module width for space-efficient panel layouts.

Advantages

The Tx3 B10A offers consistent thermal-magnetic tripping behavior suitable for general-purpose circuits, combining protection against overload and short circuits in a single compact unit. Its three-pole design ensures simultaneous switching and protection of all phases in three-phase systems, reducing the risk of phase imbalance during fault clearing. The modular form factor simplifies installation in standard DIN-rail cabinets and supports tidy, space-saving distribution board design.

Suitable for

• Protection of lighting and socket circuits in residential properties
• Protection of small motors and general-purpose loads in light-commercial installations
• Use as phase protection in three-phase branch circuits
• Retrofit or new-install distribution board applications requiring a compact 3-module breaker

Key specifications

• Poles: 3-pole configuration for three-phase protection
• Tripping characteristic: B curve (suitable for resistive and light inductive loads)
• Rated current: 10 A
• Breaking capacity: up to 6 kA short-circuit withstand
• Width: 3 modules (3M) for DIN-rail mounting
• Mounting: standard TH35 DIN-rail compatible

How to use

Install the breaker on a standard DIN-rail inside the distribution board, ensuring proper phase alignment and secure terminal connections according to local electrical codes. Tighten line and load conductors to the manufacturer-recommended torque and verify that the protective device is correctly rated for the connected circuit. After installation, restore supply and test the breaker operation by applying load and verifying that the device remains closed under normal conditions and trips when an overload or short-circuit occurs.

Usage recommendations

Confirm compatibility with the upstream protection and coordination requirements of the installation, and ensure conductor sizes and cable types match the 10 A rated current. For three-phase circuits, ensure simultaneous disconnection requirements are met and consider coordination with residual-current devices or upstream breakers where required by regulations.