TX3 Circuit Breaker 4P 40A Curve C Curve C 6kA

The Legrand TX³ 403630 miniature circuit breaker is an automatic switch with 4 protected poles and 40 amps, designed to protect electrical installations against overloads and short circuits. It features a C tripping curve, a rated voltage of 400 volts, and a breaking capacity of 6 kA at 400 volts according to EN 60898-1.

Its 4-module format and DIN rail mounting make it easy to integrate into residential, commercial, and industrial electrical panels. In addition to thermal-magnetic protection, the device can be used to control and isolate the electrical circuit and supports different auxiliaries and accessories from the Legrand DX³ range.

Legrand TX³ 4-pole 40 amp miniature circuit breaker

Reference 403630 belongs to Legrand’s TX³ range of miniature circuit breakers. It has 4 total poles and 4 protected poles, providing thermal-magnetic protection on all poles of the device.

The rated current is 40 amps and the rated operating voltage is 400 volts AC, with a nominal range indicated by Legrand between 360 and 440 volts.

Protection against overloads and short circuits

The circuit breaker combines two protection principles. The thermal part acts against sustained overloads that can cause excessive heating of the conductors, while the magnetic trip provides rapid operation in the event of high currents caused by a short circuit.

This combination helps protect wiring and connected equipment against the main overcurrent situations that can occur in an electrical installation.

C tripping curve

The Legrand 403630 features a C tripping curve. The manufacturer sets the magnetic threshold for this curve between 5 and 10 times the rated current.

In this 40-amp version, the magnetic trip is between 200 and 400 amps. This feature allows it to withstand certain momentary current surges while maintaining a fast response to short circuits.

Breaking capacity of 6 kA at 400 volts

According to EN 60898-1, the miniature circuit breaker has a rated breaking capacity of 6 kA at 400 volts.

For a voltage of 230 volts, Legrand indicates a rated breaking capacity of 10 kA according to EN 60898-1.

Breaking capacity according to IEC 60947-2

According to IEC 60947-2, the ultimate breaking capacity specified by Legrand is:

• 6 kA at 400 volts.
• 10 kA at 230 volts.

Breaking capacity values must always be interpreted together with the voltage and the corresponding test standard.

Energy limiting class 3

The Legrand TX³ 403630 has an energy limiting class 3 in accordance with EN 60898-1.

Energy limiting helps reduce the energy passing through the installation during a short circuit, decreasing the thermal and electrodynamic stresses on conductors and other downstream components.

DIN rail mounting and 4-module format

The miniature circuit breaker is designed for DIN rail mounting and occupies a width equivalent to 4 modules.

Its installation depth is 44 mm, allowing it to be integrated into modular electrical panels alongside residual current devices, contactors, surge protection devices, and other protection and control devices.

Dimensions

• Width: 70.8 mm.
• Height: 88 mm.
• Depth: 77.8 mm.
• Installation depth: 44 mm.
• Module width: 4 modules.

IP20 protected terminals

The terminals are designed with IP20 protection against accidental finger contact when the device is correctly installed.

The circuit breaker uses screw terminals and can be connected either with conductors or with compatible comb busbar distribution systems.

Connection capacity

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

The terminal capacity allows the miniature circuit breaker to be used in electrical panels with different conductor cross-sections within the limits established by Legrand.

Top or bottom feed

The TX³ 403630 allows electrical supply from the top or bottom, providing greater flexibility during panel design and wiring.

Legrand provides for connection using copper cable or a compatible distribution comb, making it easier to supply several modular devices together.

500-volt insulation voltage

The device’s rated insulation voltage is 500 volts. It also has a rated impulse withstand voltage of 4 kV.

• Rated voltage: 400 volts.
• Rated voltage range: between 360 and 440 volts.
• Insulation voltage: 500 volts.
• Impulse withstand voltage: 4 kV.
• Frequency: between 50 and 60 Hz.

IP20 and IK02 protection

The circuit breaker has an IP20 protection rating and IK02 mechanical impact resistance.

Its assigned pollution degree is 2, in accordance with the technical characteristics specified by Legrand.

Compatible with Legrand DX³ auxiliaries

The miniature circuit breaker can be complemented with compatible auxiliaries and accessories from the Legrand DX³ range, allowing the functions of the electrical panel to be expanded according to project needs.

Options in the range include control and signaling auxiliaries and compatible operating solutions. Accessory selection should be checked in Legrand’s current documentation.

Integrated label holder

The front features an integrated label holder that makes it easy to clearly identify the protected circuit.

This feature simplifies installation, inspection, and maintenance tasks, especially in panels containing a large number of circuits.

Halogen-free construction

Legrand specifies this miniature circuit breaker as halogen-free. The housing has a grey finish similar to RAL 7035.

Legrand TX³ 403630 technical specifications

• Brand: Legrand.
• Range: TX³.
• Reference: 403630.
• EAN: 3245064036306.
• Product type: thermal-magnetic circuit breaker.
• Number of poles: 4.
• Number of protected poles: 4.
• Rated current: 40 amps.
• Tripping curve: C.
• Magnetic threshold: between 200 and 400 amps.
• Rated voltage: 400 volts AC.
• Rated voltage range: between 360 and 440 volts.
• Frequency: between 50 and 60 Hz.
• Breaking capacity according to EN 60898-1 at 400 volts: 6 kA.
• Breaking capacity according to EN 60898-1 at 230 volts: 10 kA.
• Ultimate breaking capacity according to IEC 60947-2 at 400 volts: 6 kA.
• Ultimate breaking capacity according to IEC 60947-2 at 230 volts: 10 kA.
• Rated insulation voltage: 500 volts.
• Impulse withstand voltage: 4 kV.
• Energy limiting class: 3.
• Pollution degree: 2.
• Mounting type: DIN rail.
• Number of modules: 4.
• Width: 70.8 mm.
• Height: 88 mm.
• Depth: 77.8 mm.
• Installation depth: 44 mm.
• Protection rating: IP20.
• Impact resistance: IK02.
• Maximum flexible conductor capacity: 25 mm².
• Maximum rigid conductor capacity: 35 mm².
• Terminal type: screw.
• Comb busbar connection: yes, with compatible systems.
• Feed direction: top or bottom.
• Compatible auxiliary devices: yes.
• Label holder: integrated.
• Halogen-free: yes.
• Color: grey similar to RAL 7035.
• Storage temperature: between -40 and 70 degrees Celsius.

Four-pole protection for electrical panels

The Legrand TX³ 403630 combines 4-pole protection, 40-amp rated current, C curve, and a breaking capacity of 6 kA at 400 volts to protect circuits against overloads and short circuits.

Its 4-module format, DIN mounting, top or bottom feed, IP20 protected terminals, label holder, and compatibility with DX³ auxiliaries make it easy to incorporate into residential, commercial, and industrial electrical panels.