The Siemens 5SU1644-1RC40 is a SENTRON / Betagard 5SU1 Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to combine overload, short-circuit and residual-current protection in a single device. The exact product designation specifies a 40 A rated current, 4-pole configuration, 300 mA residual-current sensitivity, Type AC protection and C tripping characteristic. Siemens' technical data specifies 415 V AC, 50 Hz, 10 kA short-circuit breaking capacity according to EN 61009-1, and 15 kA according to IEC 60947-2.
The device is intended for compatible three-phase electrical circuits where combined overcurrent and residual-current protection is required in a single modular RCBO.
The 5SU1644-1RC40 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family. Unlike an RCCB, which mainly provides residual-current protection, an RCBO integrates multiple protective functions into one device.
It provides:
Overload protection
Short-circuit protection
Residual-current protection
This integrated arrangement can simplify circuit-level protection and reduce the need for separate MCB and RCCB devices.
The current Indian product listing identifies the exact article as RCBO 40 A, 4-pole, 8 modules, C characteristic, Type AC, 300 mA.
The RCBO has a rated current of 40 A.
This makes it suitable for compatible three-phase circuits and feeders designed around a 40 A protective device. The actual circuit selection should consider cable capacity, connected load, installation method, ambient conditions and applicable electrical regulations.
The 5SU1644-1RC40 uses a C tripping characteristic.
The C curve is intended for circuits where normal operation can involve moderate starting or inrush currents.
Potential applications include compatible:
Motors
Pumps
Fans
Control transformers
Contactors and solenoids
Industrial equipment
Selected lighting and electronic loads
The C characteristic should be selected according to the actual load and protection-coordination requirements.
The RCBO uses Type AC residual-current protection.
Type AC protection is intended for compatible sinusoidal alternating residual currents. The residual-current waveform of the connected equipment should be considered before selecting the protection type.
For equipment capable of generating pulsating DC or other residual-current waveforms, a different RCBO type may be required. The exact Siemens article is specified as Type AC.
The 5SU1644-1RC40 has a rated residual operating current of 300 mA.
When the residual-current condition reaches the specified operating threshold, the RCBO disconnects the protected circuit.
The 300 mA sensitivity should be selected according to the complete electrical protection design. It should not automatically be substituted with a 30 mA device because the two have different operating thresholds and protection applications.
The exact Siemens data confirms a 300 mA rated tripping fault current.
The RCBO has 4 poles, making it suitable for compatible three-phase plus neutral electrical systems.
The four-pole construction allows the relevant three phases and neutral to be incorporated into the circuit-protection arrangement.
Typical applications include:
Three-phase distribution boards
Industrial feeder circuits
PCC panels
MCC panels
Commercial electrical panels
Machine power circuits
Factory electrical systems
Sub-distribution boards
The exact Siemens technical data specifies a 415 V AC supply voltage and 50 Hz operating frequency for the 5SU1644-1RC40.
This makes it suitable for compatible three-phase low-voltage distribution systems where the system voltage and protection requirements match the device.
The technical datasheet specifies a 10 kA short-circuit current breaking capacity according to EN 61009-1. It additionally specifies 15 kA according to IEC 60947-2 for the relevant switching-capacity parameter. The rated residual switching capacity is 10 kA.
The prospective short-circuit current at the installation point should still be checked during system design, with appropriate coordination of upstream protection.
A major advantage of the 5SU1644-1RC40 is that it integrates several protection functions into one device.
A conventional protection arrangement may use:
MCB + RCCB
An RCBO combines these functions:
RCBO = Overload + Short Circuit + Residual Current Protection
This can simplify panel architecture and provide dedicated protection for an individual circuit.
The supplied product description identifies the article as an 8-module RCBO, and Indian product listings use the same 8 modules designation.
The current technical datasheet, however, specifies a physical width of 126 mm and 7 modular width units.
For the SB Smart product page, it is therefore appropriate to retain the supplied official market-facing description “8 modules” in the product title while showing the physical dimensions separately in the technical specification.
The current technical data specifies approximately:
Height: 90 mm
Width: 126 mm
Depth: 70 mm
Installation depth: 70 mm
Modular width units: 7
This information is useful for panel builders when checking enclosure space and mounting arrangements.
The 5SU1 RCBO family is designed for modular electrical-panel installation.
The 5SU1644-1RC40 can be integrated into suitably sized electrical panels and distribution assemblies along with compatible protection and control devices.
Its four-pole construction and integrated RCBO functions make it suitable for circuit-level protection in industrial and commercial installations.
The technical data specifies neutral conductor switching for the device.
This supports the four-pole protection arrangement used in compatible three-phase-plus-neutral systems.
The technical datasheet specifies that the power supply connection can be positioned either at the top or bottom.
This provides flexibility during panel wiring and installation.
Siemens' technical data specifies a touch-protection feature for the device.
The RCBO should nevertheless always be installed in a suitable electrical distribution assembly according to applicable safety requirements.
The overcurrent section of the RCBO protects the connected circuit against sustained excessive current caused by overload.
The 40 A rated current should be coordinated with:
Cable ampacity
Connected load
Installation method
Ambient temperature
Protection coordination requirements
Correct selection helps avoid both inadequate protection and nuisance tripping.
The RCBO also provides short-circuit protection through its integrated overcurrent section.
The specified 10 kA EN 61009-1 breaking capacity should be considered against the prospective short-circuit current at the installation point.
Residual current occurs when part of the electrical current flows through an unintended path, such as an earth-leakage path.
The RCBO monitors the relevant residual-current condition and disconnects the circuit when the operating threshold reaches the specified 300 mA level.
This provides residual-current protection in addition to overload and short-circuit protection.
The C characteristic can be useful for compatible circuits where moderate starting or inrush currents occur.
Potential applications include:
Pumps
Fans
Small and medium motors
Control transformers
Solenoids
Contactors
Industrial machinery
Selected automation equipment
The exact application should be evaluated according to the load starting characteristics and protection-coordination requirements.
Type AC protection is intended for compatible sinusoidal AC residual currents.
The 5SU1644-1RC40 should therefore be selected where the connected equipment is compatible with Type AC residual-current detection.
For modern equipment containing rectifiers, variable-speed drives or other power-electronic circuits, the appropriate residual-current type should be verified before selection.
The 5SU1644-1RC40 can be considered for compatible:
Industrial distribution boards
Three-phase equipment feeders
PCC panels
MCC panels
Machine power circuits
Commercial switchboards
Factory electrical systems
Sub-distribution boards
Building electrical panels
The final application should follow the electrical design and applicable regulations.
A typical arrangement may be:
Incoming Supply → RCBO → Protected Three-Phase Load
Because the RCBO already integrates overcurrent protection, its characteristics should still be coordinated with the upstream system and prospective fault current.
Protection design should consider:
Prospective short-circuit current
Cable capacity
Load current
C-curve characteristics
Residual-current sensitivity
Upstream protection
Applicable standards
RCBOs should be included in the electrical installation's regular inspection and testing program.
The test function should be operated according to Siemens' instructions and applicable maintenance requirements to verify the residual-current protection function.
Regular testing helps confirm that the protective mechanism remains operational.
Before selecting the 5SU1644-1RC40, verify:
Rated current: 40 A
Residual-current sensitivity: 300 mA
Residual-current type: Type AC
Tripping characteristic: C
Pole configuration: 4-pole
Rated voltage: 415 V AC
Operating frequency: 50 Hz
Short-circuit capacity: 10 kA according to EN 61009-1
Panel space requirements
Cable size and installation method
Load inrush characteristics
Applicable electrical regulations
The 5SU1644-2RC40 is the corresponding 40 A, 4-pole, Type AC, 300 mA RCBO with a D characteristic.
Therefore:
5SU1644-1RC40 → C characteristic
5SU1644-2RC40 → D characteristic
The main difference is the overcurrent tripping characteristic. The D curve is intended for compatible loads with higher starting or inrush currents.
The 5SU1644-1RC32 is the corresponding 32 A, 4-pole, Type AC, 300 mA, C-characteristic RCBO.
Therefore:
5SU1644-1RC32 → 32 A
5SU1644-1RC40 → 40 A
The main difference is the rated current.
The 5SU1644-1RC63 is the corresponding 63 A, 4-pole, Type AC, 300 mA, C-characteristic RCBO.
Therefore:
5SU1644-1RC40 → 40 A
5SU1644-1RC63 → 63 A
The rated current must be selected according to the protected circuit. The 63 A article's technical data confirms the same basic Type AC and C-characteristic configuration.
The Type A version should be selected where the installation requires detection of suitable AC residual currents with pulsating DC components.
The 5SU1644-1RC40 is specifically Type AC, so it should not be substituted with Type A or Type B without checking the residual-current characteristics of the connected equipment.
The 5SU1644-2RC40 uses the same:
40 A rating
4-pole configuration
Type AC protection
300 mA residual-current sensitivity
but uses a D tripping characteristic instead of C.
Therefore, selection depends mainly on the expected load inrush current.
The 5SU1644-1RC40 is specifically a 300 mA residual-current version.
A 30 mA RCBO is a different product configuration and should not be used as a direct replacement unless the protection design specifically calls for that threshold.
The 5SU1654 series contains compact 2-pole RCBOs for compatible single-phase circuits.
The 5SU1644-1RC40 is a 4-pole RCBO intended for compatible three-phase-plus-neutral applications, so the pole configuration must be checked carefully when selecting a replacement.
The Siemens 5SU1644-1RC40 is relevant for:
Electrical panel builders
Industrial buyers
Electrical contractors
OEMs
Machine builders
Factory maintenance teams
Commercial electrical contractors
Electrical distributors
Automation system integrators
Electrical product dealers
For SB Smart, the product is positioned as a Siemens SENTRON / Betagard 5SU1 Type AC RCBO for 40 A three-phase circuit protection with C characteristic.
| Specification | Details |
|---|---|
| Brand | Siemens |
| Product Family | SENTRON / Betagard 5SU1 |
| Article Number | 5SU1644-1RC40 |
| Product Type | Residual Current Circuit Breaker with Overcurrent Protection (RCBO) |
| Rated Current | 40 A |
| Number of Poles | 4 Pole / 4P |
| Tripping Characteristic | C Curve |
| Residual Current Type | Type AC |
| Rated Residual Operating Current | 300 mA |
| Rated Operating Voltage | 415 V AC |
| Operating Frequency | 50 Hz |
| Insulation Voltage (Ui) | 440 V |
| Surge Voltage Resistance | 4 kV |
| Short-Circuit Breaking Capacity | 10 kA according to EN 61009-1 |
| IEC 60947-2 Switching Capacity | 15 kA |
| Residual Switching Capacity | 10 kA |
| Energy Limitation Class | 3 |
| Protection Degree | IP20, when installed in suitable distribution-board conditions |
| Overvoltage Category | III |
| Pollution Degree | 2 |
| Neutral Conductor Switching | Yes |
| Power Supply Position | Top or bottom |
| Mounting Position | Any |
| Height | 90 mm |
| Width | 126 mm |
| Depth | 70 mm |
| Installation Depth | 70 mm |
| Technical Modular Width | 7 modular width units |
These values are taken from the current technical datasheet for 5SU1644-1RC40. The Indian product listing describes the same article as 40 A, 4-pole, 8 modules, C characteristic, Type AC, 300 mA, 415 V AC.
Siemens SENTRON / Betagard 5SU1 RCBO
Article number 5SU1644-1RC40
40 A rated current
4-pole configuration
Type AC residual-current protection
300 mA residual-current sensitivity
C tripping characteristic
415 V AC rated voltage
50 Hz operating frequency
10 kA EN 61009-1 short-circuit breaking capacity
15 kA IEC 60947-2 switching capacity
10 kA residual switching capacity
440 V insulation voltage
4 kV surge-voltage resistance
Neutral conductor switching
Top or bottom power-supply connection
Integrated overload and short-circuit protection
Integrated residual-current protection
Suitable for compatible three-phase-plus-neutral circuits
Combined protection: Integrates overload, short-circuit and residual-current protection in one device.
40 A rating: Suitable for compatible three-phase circuits and feeders.
Type AC protection: Designed for compatible sinusoidal AC residual currents.
300 mA sensitivity: Provides residual-current protection at the specified operating threshold.
C characteristic: Suitable for compatible loads with moderate inrush current.
4-pole construction: Suitable for compatible three-phase-plus-neutral systems.
10 kA EN 61009-1 breaking capacity: Provides substantial short-circuit interruption capability within specified conditions.
Neutral switching: Supports the four-pole circuit arrangement.
Flexible supply connection: Power can be connected from the top or bottom.
The Siemens 5SU1644-1RC40 combines 40 A overcurrent protection, C-curve tripping and Type AC 300 mA residual-current protection in a four-pole RCBO designed for compatible three-phase circuits.
The current technical datasheet confirms 415 V AC, 50 Hz, 40 A, Type AC, 300 mA, C characteristic, 4-pole configuration and 10 kA EN 61009-1 short-circuit breaking capacity.
For SB Smart, this product is best presented as a Siemens Betagard/SENTRON 5SU1 Type AC RCBO for 40 A, 300 mA three-phase circuit protection with C characteristic across India.
SB Smart supplies Siemens SENTRON/Betagard RCBOs, RCCBs and industrial electrical protection products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and other major Indian cities.
Major delivery locations include:
Faridabad
Delhi
Gurgaon/Gurugram
Delhi NCR
Noida
Greater Noida
Haryana
Punjab
Mumbai
Pune
Ahmedabad
Bengaluru
Hyderabad
Chennai
Kolkata
Jaipur
Chandigarh
Lucknow
Indore
Surat
Vadodara
Nagpur
Coimbatore
And other major cities across India
The 5SU1644-1RC40 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 40 A, with 4 poles, C characteristic, Type AC residual-current protection and 300 mA sensitivity.
It is an RCBO, meaning it combines residual-current protection with overcurrent protection.
The rated current is 40 A.
The rated residual operating current is 300 mA.
It uses Type AC residual-current protection.
It has a C tripping characteristic.
It has 4 poles, suitable for compatible three-phase-plus-neutral applications.
The exact technical datasheet specifies 415 V AC.
The technical datasheet specifies 10 kA according to EN 61009-1 and 15 kA according to IEC 60947-2 for the relevant switching-capacity parameter.
5SU1644-1RC40: 40 A, 4-pole, Type AC, 300 mA, C characteristic.
5SU1644-2RC40: 40 A, 4-pole, Type AC, 300 mA, D characteristic.
The main difference is the overcurrent tripping characteristic.
5SU1644-1RC40: 40 A, 4-pole, Type AC, 300 mA, C characteristic.
5SU1644-1RC63: 63 A, 4-pole, Type AC, 300 mA, C characteristic.
The main difference is the rated current.
SB Smart supplies Siemens SENTRON/Betagard 5SU1 RCBOs and industrial electrical protection products in India for panel builders, electrical contractors, OEMs, industrial buyers, machine builders and maintenance requirements.
|
Parameter |
Specification |
|
Product Series |
Siemens
Betagard 5SU1 |
|
Part Number |
5SU1644-1RC40 |
|
Product Type |
RCBO (Residual
Current Breaker with Overload Protection) |
|
Type |
Type AC |
|
Rated Current |
40 A |
|
Tripping Curve |
C
Characteristic |
|
Poles |
4 Pole (4P) |
|
Rated Voltage |
415 V AC |
|
Frequency |
50 Hz |
|
Residual
Current Protection |
Earth leakage
protection |
|
Mounting Type |
DIN Rail |
|
Degree of
Protection |
IP20 |
|
Standard |
IEC 61009-1 |
|
Application |
Commercial
& Industrial Distribution |
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