Super Immunised Differential 2P 40A 300mA

The Procoel SI240300 super immune residual current circuit breaker is a 2-pole, 40 A device with a 300 mA residual current sensitivity designed to protect electrical installations against earth leakage residual currents. Its Class F technology provides high immunity against nuisance tripping and allows it to detect residual currents with components at different frequencies, making it especially suitable for circuits with variable frequency drives, inverter air conditioning, computer equipment, and other electronic loads.

The SI240300 features a conditional short-circuit current rating of 10 kA, electromechanical operation, IP20 protection rating, and connection for conductors up to 35 mm². Its bipolar format is intended for single-phase installations and the neutral is located on the left side.

Class F super immune residual current circuit breaker

Class F expands detection performance for residual currents present in modern installations with power electronics. In addition to sinusoidal alternating currents and the waveforms covered by Class A RCDs, it can respond to residual currents composed of multiple frequencies.

Procoel specifies for this range the ability to detect mixed-frequency residual currents up to 1 kHz, a feature especially useful in installations with non-linear loads and electronic equipment.

High immunity against nuisance tripping

The super immune design of the SI240300 increases resistance to disturbances that can cause unwanted disconnections in conventional residual current devices.

This feature is especially useful in installations with harmonics, electronic filters, converters, or inverter equipment, where reducing unnecessary power interruptions is a priority.

300 mA residual current sensitivity

The rated residual operating current IΔn is 300 mA. This sensitivity is commonly used in circuits where residual current protection is required against insulation faults with a threshold higher than that of 30 mA high-sensitivity RCDs.

The sensitivity must be selected according to the electrical scheme, the protection devices installed upstream and downstream, and the regulatory requirements of each circuit.

2 poles for single-phase installations

The SI240300 has 2 poles and is designed to interrupt the live conductors of a single-phase installation. The neutral is located on the left side of the device, which must be respected during connection.

40 A rated current

The rated current of the residual current circuit breaker is 40 A. As this is an RCD without built-in overcurrent protection, it must be coordinated with the appropriate miniature circuit breakers to protect the circuit against overloads and short circuits.

10 kA conditional short-circuit current rating

Procoel specifies a conditional short-circuit current rating of 10 kA in accordance with the conditions established by the applicable standards for residual current circuit breakers.

Coordination with overcurrent protection devices must be carried out according to the characteristics of the installation and the manufacturer's instructions.

Detection of leakage currents up to 1 kHz

One of the main features of the Class F RCD is its ability to respond to residual currents containing different frequencies, typical of electronic equipment and converters.

The SI240300 can detect alternating currents, pulsating currents with DC components, and mixed-frequency residual currents up to 1 kHz.

Resistance to transient surges

The SI range offers high immunity to transient currents. For this model, resistance to 8/20 µs waveform surges of up to 3 kA is specified.

This feature helps reduce unwanted tripping caused by certain short-duration transient disturbances.

Electromechanical operation

The Procoel SI240300 uses an electromechanical operating principle. The detection, evaluation, and residual current tripping functions do not depend on externally powered auxiliary electronics.

This design helps maintain residual current protection under supply voltage variations within the conditions specified by the manufacturer.

Especially suitable for electronic loads

The Class F technology makes the SI240300 an especially suitable option for circuits with equipment capable of generating distorted or high-frequency residual currents.

• Inverter air conditioning units.
• Variable frequency drives and converters.
• Electronically controlled pumps.
• Computer equipment.
• Switched-mode power supplies.
• Appliances with electronic speed control.
• Industrial equipment with power electronics.
• Commercial installations with numerous electronic loads.

Connection by cable or comb busbar

The residual current circuit breaker accepts connection by copper conductors up to 35 mm² and allows the use of compatible PIN-type distribution comb busbars.

This feature makes it easier to integrate alongside other modular devices inside the electrical panel.

Mechanical position indicator

The SI240300 includes visual indication to quickly check the position of its contacts:

• Red: contacts closed, ON position.
• Green: contacts open, OFF position.

Modular DIN rail format

The residual current device is installed on DIN rail and has approximate dimensions of 85 mm high, 58 mm deep, and 35 mm wide, corresponding to a compact 2-module format.

It can be installed in either vertical or horizontal position according to the panel layout requirements.

IP20 protection

The SI240300 has an IP20 protection rating and is designed to be installed inside electrical panels or suitable enclosures that provide the necessary environmental and contact protection.

Applicable standards

The range is manufactured in accordance with IEC/EN 61008-1 for residual current circuit breakers without built-in overcurrent protection. For the specific Class F performance, the technical documentation also refers to EN 62423.

Technical specifications of the Procoel SI240300

• Brand: Procoel / Hyundai Electric.
• Reference: SI240300.
• Type: super immune residual current circuit breaker.
• Class: F.
• Number of poles: 2P.
• Application: single-phase installation.
• Neutral position: left.
• Rated current: 40 A.
• Residual current sensitivity IΔn: 300 mA / 0.3 A.
• Rated voltage: 230/400 V AC.
• Conditional short-circuit current rating: 10 kA.
• Operation: electromechanical.
• Frequency detection: up to 1 kHz.
• Immunity to 8/20 µs surges: up to 3 kA.
• Low-value DC currents that do not affect operation: up to 10 mA.
• Connection capacity: conductors from 1 to 35 mm².
• Compatible with PIN-type comb busbar: yes.
• Position indicator: red ON / green OFF.
• Protection rating: IP20.
• Mounting: DIN rail.
• Width: 35 mm.
• Approximate dimensions: 85 x 58 x 35 mm.
• Installation position: vertical or horizontal.
• Auxiliary contacts: no.
• Declared electrical/mechanical durability: minimum 2000 operations.
• Standards: IEC/EN 61008-1 and EN 62423 for Class F performance.
• Marking: CE.

Residual current protection for installations with electronics

The Procoel SI240300 combines a 40 A rated current and 300 mA sensitivity with the immunity and detection performance of a Class F residual current device. Its ability to recognize mixed-frequency residual currents up to 1 kHz makes it suitable for installations with a high presence of electronic equipment.

The 10 kA conditional short-circuit current rating, immunity to surges up to 3 kA, terminals up to 35 mm², and 2-module format complete a solution designed for compatible residential, commercial, and industrial installations.

Important: the SI240300 is a residual current circuit breaker and does not include thermal-magnetic protection against overloads or short circuits. In addition, its 300 mA sensitivity must not be confused with the 30 mA additional high-sensitivity protection required in certain circuits. Selection and installation must be carried out in accordance with the applicable regulations and the specific characteristics of the installation.