IID Differential 4P 40A 500mA Class AC

The Schneider Electric Acti9 iID A9R16440 residual current circuit breaker is a 4-pole, 40 A RCCB with a 500 mA residual current sensitivity, designed to detect AC earth leakage currents and automatically disconnect the circuit when the tripping conditions are reached. It operates at 380-415 V AC and 50/60 Hz, features instantaneous tripping, and is especially suitable for three-phase installations requiring four-pole residual protection.

The A9R16440 reference is part of Schneider Electric’s Acti9 iID range and includes features such as VisiTrip to visually identify a residual trip and VisiSafe to confirm the physical opening of the contacts. Its 72 mm modular design makes it easy to install on DIN rail in distribution electrical panels.

4-pole RCCB residual current circuit breaker

The A9R16440 has 4 poles and is designed for the simultaneous disconnection of all of them when a residual current above the set limit is detected.

In three-phase installations with neutral, it allows the three phases and the neutral conductor to be controlled together. Schneider Electric places the neutral on the left side of the device.

40 A rated current

The rated current of the residual current circuit breaker is 40 A. This value represents the current the device can carry continuously within its rated operating conditions.

The 40 A rating should not be confused with the 500 mA residual sensitivity. Both values serve different functions:

• 40 A: rated current that can flow through the device.
• 500 mA: sensitivity of the protection against residual currents or earth leakage.

500 mA residual current sensitivity

The Schneider Electric A9R16440 has a residual current sensitivity IΔn of 500 mA.

This sensitivity level is mainly intended for protection against certain insulation faults, indirect contact under the conditions provided for in the installation, and reducing the risk of fire associated with leakage currents.

A 500 mA RCCB should not be considered equivalent to a high-sensitivity 30 mA RCCB for additional personal protection. The required sensitivity must be determined according to the protection scheme, earthing system, and applicable regulations for each installation.

Type AC residual protection

The residual current class of the A9R16440 is type AC. This type of circuit breaker is designed to detect sinusoidal alternating residual currents.

The selection of the RCCB type should take into account the characteristics of the connected loads. In installations with certain electronic equipment, rectifiers, variable speed drives, or other loads capable of generating residual components other than a sinusoidal AC current, it may be necessary to select a type A, A-SI, or another appropriate class.

Instantaneous residual tripping

The device features instantaneous operation, meaning it does not incorporate an intentional tripping delay like selective residual current circuit breakers.

When the residual current reaches the specified operating conditions, the mechanism opens the circuit within the times defined by the applicable standard.

Voltage-independent tripping

Schneider Electric specifies a voltage-independent residual current tripping technology for the A9R16440.

This feature means the basic residual function does not depend on an external auxiliary electronic supply to detect current imbalance and operate the tripping mechanism.

380-415 V AC rated voltage

The main electrical characteristics of the Schneider Electric A9R16440 are:

• Rated operational voltage Ue: 380-415 V AC.
• Frequency: 50/60 Hz.
• Rated current In: 40 A.
• Residual current sensitivity IΔn: 500 mA.
• Residual current class: type AC.
• Operation: instantaneous.
• Rated insulation voltage Ui: 500 V.
• Rated impulse withstand voltage Uimp: 6 kV.

1,500 A residual making and breaking capacity

Schneider Electric specifies a rated making and breaking capacity Im/IΔm of 1,500 A.

This value corresponds to the circuit breaker’s ability to make, carry, and break certain currents under the conditions defined by the standard and should not be confused with the breaking capacity of a miniature circuit breaker.

10 kA conditional short-circuit current

The A9R16440 has a conditional short-circuit current Inc/IΔc of 10 kA.

This value is valid when the RCCB is correctly coordinated with the upstream short-circuit protection device specified for the installation.

Therefore, 10 kA does not mean that the A9R16440 can replace an MCB with its own 10 kA breaking capacity.

Does not protect against overloads or short circuits

The Schneider Electric A9R16440 is a pure RCCB or residual current circuit breaker. Its function is to detect residual currents and earth leakage.

It does not include thermal or magnetic trip units to protect the circuit against overloads or short circuits.

It must be used together with:

• Miniature circuit breakers.
• Main circuit breakers.
• Fuses or other properly sized overcurrent protection devices.

VisiTrip for identifying residual trips

The device includes VisiTrip, a signalling system with a red mechanical indicator on the front.

This indication makes it easy to quickly identify that the device has operated due to a residual fault, helping with diagnostics and maintenance in panels with multiple protections.

VisiSafe to check contact opening

The VisiSafe system provides a visual indication associated with the effective opening of the contacts.

This function improves identification of the device status and complements its suitability for isolation in accordance with EN/IEC 61008-1.

DIN rail mounting

The A9R16440 is designed for clip-on installation on DIN rail, making it easy to integrate alongside miniature circuit breakers and other Acti9 modular devices.

It occupies:

• 8 x 9 mm pitches.
• 4 standard 18 mm modules.
• Total width: 72 mm.

Schneider Electric A9R16440 dimensions

• Width: 72 mm.
• Height: 91 mm.
• Depth: 73.5 mm.
• Installation depth: approximately 44 mm.
• Weight: approximately 0.37 kg.
• Color: white RAL 9003.

Top or bottom connection

The Acti9 iID terminals allow supply connection from the top or bottom, making it easier to adapt to different panel configurations.

The indicated connection capacities are:

• Rigid conductor: 1 to 35 mm².
• Flexible conductor: 1 to 25 mm².
• Flexible conductor with ferrule: 1 to 25 mm².
• Strip length: 14 mm.
• Tightening torque: 3.5 Nm.

Compatible with distribution comb busbars

The Acti9 modular design allows the A9R16440 to be integrated with compatible comb busbars and distribution systems, from either the top or bottom depending on the panel configuration.

This helps create neat panels and reduces the amount of individual wiring needed between compatible devices.

Mechanical and electrical durability

Schneider Electric specifies a high service life for this reference:

• Mechanical durability: up to 20,000 cycles.
• Electrical durability: up to 15,000 cycles under the indicated conditions.

These features make it suitable for professional installations where reliability and periodic maintenance are required throughout the panel’s service life.

Resistance to surge currents

For this type AC version, a surge current withstand of 250 A with 8/20 µs waveform is specified, in accordance with the conditions covered by EN/IEC 61008-1.

When the installation has a high level of transient disturbances or a risk of nuisance tripping, it may be advisable to consider other residual current classes, such as superimmunized A-SI versions, provided they are suitable for the application.

IP20 protection rating

The device has an IP20 protection rating as a standalone component.

Once correctly integrated into a suitable modular panel, the front may achieve a protection rating of up to IP40, depending on the enclosure used.

Environmental operating conditions

The A9R16440 is designed to operate in electrical panels under the environmental conditions specified for the range:

• Operating ambient temperature: -5 to 60 °C.
• Storage temperature: -40 to 85 °C.
• Pollution degree: 3.

Applications of the Schneider Electric A9R16440

Due to its four-pole configuration and 500 mA sensitivity, the Acti9 iID A9R16440 can be integrated into electrical panels where general residual protection or protection of certain three-phase lines is required, provided that the type AC and selected sensitivity are appropriate.

Possible areas of use include:

• Three-phase distribution panels.
• Tertiary installations.
• Commercial premises.
• Service buildings.
• Sub-distribution boards.
• Compatible industrial installations.
• Protection against insulation faults and fire risk.

The suitability of type AC and 500 mA sensitivity must always be checked according to the loads, earthing system, upstream protection devices, and installation regulations.

Schneider Electric A9R16440 technical characteristics

• Brand: Schneider Electric.
• Reference: A9R16440.
• Range: Acti9.
• Model: iID.
• Product type: RCCB residual current circuit breaker.
• Number of poles: 4P.
• Neutral position: left.
• Rated current In: 40 A.
• Residual current sensitivity IΔn: 500 mA.
• Residual current class: type AC.
• Time delay: instantaneous.
• Tripping technology: voltage independent.
• Rated voltage Ue: 380-415 V AC.
• Frequency: 50/60 Hz.
• Rated making and breaking capacity Im/IΔm: 1,500 A.
• Conditional short-circuit current Inc/IΔc: 10 kA with suitable upstream protection.
• Insulation voltage Ui: 500 V.
• Rated impulse withstand voltage Uimp: 6 kV.
• Surge current withstand: 250 A, 8/20 µs waveform.
• Trip indicator: VisiTrip.
• Opening indication: VisiSafe.
• Suitable for isolation: yes.
• Control: lever.
• Mounting: DIN rail.
• Width: 72 mm.
• Height: 91 mm.
• Depth: 73.5 mm.
• Modular width: 4 x 18 mm modules.
• Weight: approximately 0.37 kg.
• Rigid conductors: 1-35 mm².
• Flexible conductors: 1-25 mm².
• Strip length: 14 mm.
• Tightening torque: 3.5 Nm.
• Protection rating: IP20.
• Mechanical durability: up to 20,000 cycles.
• Electrical durability: up to 15,000 cycles.
• Operating temperature: -5 to 60 °C.
• Main standard: EN/IEC 61008-1.

Four-pole residual protection for distribution panels

The Schneider Electric Acti9 iID A9R16440 provides residual protection in 380-415 V networks through four poles, 40 A rated current, and 500 mA sensitivity. Its instantaneous operation, VisiTrip, VisiSafe, DIN rail mounting, and high-capacity terminals make it easy to integrate into professional electrical panels.

The 500 mA sensitivity mainly makes it suitable for protection against insulation faults, indirect contact according to the protection scheme, and reduction of fire risk, provided it is appropriate for the installation characteristics.

Important: the A9R16440 is an RCCB residual current circuit breaker and does not include overload or short-circuit protection. It must be combined with the appropriate MCB or fuse protection. In addition, its 500 mA sensitivity does not replace a 30 mA RCCB when regulations or installation design require high-sensitivity additional personal protection.