TX3 4P 32A Circuit Breaker Curve C 6kA

The Legrand TX³ 403629 MCB is a four-pole miniature circuit breaker designed to protect electrical installations against overloads and short circuits. It features 4 protected poles, a rated current of 32 amps, C tripping curve, and a rated voltage of 400 volts AC.

With a breaking capacity of 6 kA at 400 V according to EN 60898-1, this TX³ range MCB is ready for integration into residential and commercial distribution boards and other electrical distribution installations. Its modular format takes up 4 modules and allows DIN rail mounting.

Legrand TX³ 4-pole 32-amp MCB

Reference 403629 belongs to the Legrand TX³ range of miniature circuit breakers. Its main function is to protect wiring and connected equipment against overcurrents that may occur as a result of an overload or a short circuit.

The device combines thermal protection, intended to act against sustained overloads, with magnetic protection, which provides fast tripping when a high short-circuit current appears.

In addition to its protective function, Legrand indicates that the breaker can be used to control and isolate the installation, making it easier to manually disconnect the circuit during maintenance or intervention work.

4 protected poles

The Legrand TX³ 403629 has 4 total poles and 4 protected poles. Its mechanism allows the associated conductors in the circuit to open together when the MCB trips.

This four-pole configuration is suitable for installations that require simultaneous protection of four conductors using a single modular device.

Rated current of 32 amps

The rated current of the MCB is 32 amps. This value must be coordinated with the conductor cross-section, load characteristics, installation method and the expected circuit conditions.

Correct selection of the circuit breaker helps protect the wiring against currents higher than those it can continuously withstand.

C tripping curve

Reference 403629 includes a C tripping curve. In this type of breaker, instantaneous magnetic tripping occurs when the current reaches approximately 5 to 10 times the rated current.

For this 32-amp model, Legrand specifies a magnetic threshold between 160 and 320 amps.

This characteristic allows certain short-duration inrush currents to be tolerated without necessarily causing an immediate trip, while still maintaining a fast response to high short-circuit currents.

Thermal protection against overloads

When the current flowing through the circuit exceeds its rated value for a certain period of time, the thermal mechanism of the MCB causes the contacts to open.

This protection helps prevent excessive heating of the wiring and other electrical components that could occur if an overload were maintained for too long.

Magnetic protection against short circuits

In the event of a high short-circuit current, the magnetic mechanism acts quickly to interrupt power to the circuit.

The combination of both systems provides, in a single device, protection against the two main types of overcurrent that can occur in an electrical installation.

6 kA breaking capacity

The Legrand 403629 has a rated breaking capacity Icn of 6 kA at 400 V according to EN 60898-1.

Breaking capacity represents the ability of the circuit breaker to safely interrupt a short-circuit current within the conditions specified by the standard and the manufacturer.

According to IEC 60947-2, Legrand also specifies an ultimate breaking capacity Icu of 6 kA at 400 V and 10 kA at 230 V.

Energy limiting class 3

The MCB has energy limiting class 3, the highest level covered by EN 60898-1 for this parameter.

Energy limitation helps reduce the amount of energy that passes through the circuit during a short-circuit condition, within the operating conditions intended for the device.

Rated voltage of 400 volts

The Legrand TX³ 403629 is designed for a rated voltage of 400 volts AC, with a rated range specified by the manufacturer of 360 to 440 volts.

The operating frequency is between 50 and 60 Hz, allowing integration into common AC distribution networks.

4-module DIN rail format

The circuit breaker is designed for DIN rail mounting inside the electrical panel and occupies a width equivalent to 4 modules.

Its approximate dimensions are:

• Width: 70.8 mm.
• Height: 88 mm.
• Depth: 77.8 mm.
• Installation depth: 44 mm.

The modular format makes it easy to install alongside RCDs, contactors and other protection and control devices.

Top or bottom supply

The Legrand 403629 offers flexibility during panel wiring, as it can be supplied from either the top or the bottom.

Connection can be made using copper cable or a pin-type distribution comb busbar, always using compatible components and following the manufacturer's installation instructions.

Connection capacity for different cable sizes

The terminals are designed to connect conductors of different cross-sections. Legrand specifies a maximum capacity of:

• Flexible conductor: up to 25 mm².
• Rigid conductor: up to 35 mm².

The system uses screw terminals and is designed to provide a secure connection inside the electrical panel.

IP20 terminal protection

The breaker has an IP20 protection rating, with terminals designed to protect against accidental contact with live parts when the equipment is correctly installed.

The mechanical impact resistance indicated by Legrand is IK02.

Integrated label holder

The front of the MCB includes a label holder that makes it possible to clearly identify the protected circuit.

This feature makes maintenance, inspection and circuit identification easier in electrical panels with multiple protection devices.

Compatible with Legrand DX³ auxiliaries

The TX³ 403629 MCB can be fitted with certain Legrand DX³ range auxiliaries and accessories, allowing additional control or signalling functions to be added.

Legrand also allows the connection of aluminium conductors using the specific compatible terminal accessory indicated for the range.

Wide range of installation conditions

The product datasheet specifies a pollution degree 2 and a storage temperature range of -40 to 70 degrees Celsius.

The device is manufactured in a grey colour similar to RAL 7035, and Legrand classifies it as a halogen-free product.

Complies with EN 60898-1

The Legrand TX³ 403629 complies with the applicable requirements of EN 60898-1 for circuit breakers intended for domestic electrical installations and similar uses.

The reference also has AENOR certification, confirming its 4 poles, 400 volts, 32 amps, C curve, 6 kA breaking capacity and energy limiting class 3.

Legrand 403629 technical characteristics

• Brand: Legrand.
• Range: TX³.
• Reference: 403629.
• EAN: 3245064036290.
• Product type: miniature circuit breaker.
• Number of poles: 4.
• Number of protected poles: 4.
• Rated current: 32 amps.
• Tripping curve: C.
• Magnetic threshold: between 160 and 320 amps.
• Rated voltage: 400 volts AC.
• Rated voltage range: between 360 and 440 volts.
• Frequency: between 50 and 60 Hz.
• Breaking capacity Icn according to EN 60898-1 at 400 V: 6 kA.
• Breaking capacity Icu according to IEC 60947-2 at 400 V: 6 kA.
• Breaking capacity Icu according to IEC 60947-2 at 230 V: 10 kA.
• Energy limiting class: 3.
• Number of modules: 4.
• Mounting: DIN rail.
• Width: 70.8 mm.
• Height: 88 mm.
• Depth: 77.8 mm.
• Installation depth: 44 mm.
• Protection rating: IP20.
• Impact resistance: IK02.
• Pollution degree: 2.
• Maximum flexible conductor size: 25 mm².
• Maximum rigid conductor size: 35 mm².
• Connection type: screw terminal, cable or distribution comb busbar.
• Supply direction: top or bottom.
• Storage temperature: between -40 and 70 degrees Celsius.
• Colour: grey RAL 7035.
• Halogen-free: yes.
• Label holder: integrated.
• Compatible with DX³ auxiliaries: yes.
• Main standard: EN 60898-1.

Four-pole protection for electrical installations

The Legrand TX³ 403629 MCB combines 32 amps, C curve, 4-pole protection and a breaking capacity of 6 kA at 400 V in a compact 4-module format.

Its DIN rail mounting, top or bottom supply, capacity for conductors up to 35 mm², label holder and compatibility with DX³ auxiliaries make it easy to integrate into electrical panels that need effective protection against overloads and short circuits.