Legrand TX3 circuit breaker Miniature circuit breaker Type B 3

Legrand Tx3 B40A is a three-pole miniature circuit breaker with a rated current of 40 A and a breaking capacity of 6 kA. Designed for DIN-rail installation with a 3-module width, this circuit breaker provides reliable overcurrent and short-circuit protection for residential and light commercial electrical installations. The device is intended for use in distribution boards to protect motors, lighting circuits and general-purpose circuits where a B-characteristic trip curve is suitable.

Advantages

The Legrand Tx3 B40A delivers selective tripping for moderate inrush currents thanks to its B-type characteristic, ensuring protection without nuisance trips for most lighting and resistive loads. Its compact 3M width saves space in distribution panels while maintaining easy DIN-rail mounting and connection. The 6 kA breaking capacity meets common installation requirements for fault clearing and contributes to safer operation of the electrical system.

Suitable for

Key specifications

How to use

Install the circuit breaker onto a standard DIN-rail inside the distribution board and make line and load connections to the appropriate terminals, observing phase sequence and tightening torque recommended by the installation standards. Ensure the installation is carried out by a qualified electrician and that the breaker is coordinated with upstream and downstream protective devices. Verify correct operation by switching the device on and off after installation and test under controlled conditions as required by local regulations.

Recommendations

Use the Legrand Tx3 B40A in circuits where a B-type trip curve is appropriate and ensure that the nominal breaking capacity matches the prospective short-circuit current of the installation. Coordinate with residual current devices or upstream breakers if required, and follow installation and maintenance intervals per local electrical codes.