Product Description

Siemens 5SU1344-1RC40 RCBO – 40A, 4-Pole, 30mA, Type AC, C-Characteristic

The Siemens 5SU1344-1RC40 is a SENTRON / Betagard 5SU1 Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to combine overload, short-circuit and residual-current protection in one device. The exact Siemens product configuration is 40 A, 4-pole, 8-module, C characteristic, Type AC and 30 mA residual-current sensitivity. The Siemens technical data specifies 415 V AC, 50 Hz, 10 kA short-circuit breaking capacity according to EN 61009-1, and 15 kA switching capacity according to IEC 60947-2. It also carries the important note that use of these devices is not permitted in all countries; national installation regulations must be observed.

Siemens 5SU1344-1RC40 RCBO

The 5SU1344-1RC40 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family.

An RCBO combines three protection functions in one device:

• Overload protection

• Short-circuit protection

• Residual-current protection

This integrated construction can simplify circuit-level protection compared with using separate MCB and RCCB devices.

The exact product listing confirms 40 A, 4-pole, 8 modules, C characteristic, Type AC and 30 mA.

40 A Rated Current

The 5SU1344-1RC40 has a rated current of 40 A.

It is suitable for compatible three-phase circuits and feeders designed around a 40 A protective device. The final rating should be coordinated with cable ampacity, connected load, installation method, ambient conditions and applicable electrical requirements.

C Tripping Characteristic

The RCBO uses a C tripping characteristic.

C-curve protection is intended for compatible circuits where moderate starting or inrush current can occur during normal operation.

Potential applications include:

• Pumps

• Fans

• Motors

• Control transformers

• Contactors

• Solenoids

• Industrial auxiliary equipment

• Selected machinery

The actual tripping characteristic should be matched to the load's starting-current characteristics and protection coordination.

Type AC Residual Current Protection

The 5SU1344-1RC40 uses Type AC residual-current protection.

Type AC is intended for compatible sinusoidal AC residual currents. The residual-current waveform of connected equipment should be checked before selecting this type.

Equipment capable of generating pulsating DC or other residual-current components may require a different residual-current protection type.

The Siemens data identifies the exact article as Type AC.

30 mA Residual Current Sensitivity

The RCBO has a rated residual operating current of 30 mA.

When the residual-current condition reaches the specified operating threshold, the RCBO disconnects the protected circuit.

The 30 mA sensitivity should be selected according to the complete protection design and applicable national installation regulations.

4-Pole Configuration

The device has 4 poles, making it suitable for compatible three-phase-plus-neutral electrical systems.

The four-pole arrangement allows the 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 three-phase panels

• Machine power circuits

• Factory electrical systems

• Sub-distribution boards

The Siemens technical data specifies 4 poles with protection.

415 V AC Application

The exact technical data specifies a 415 V AC supply voltage and 50 Hz operating frequency.

This makes the device suitable for compatible three-phase low-voltage electrical systems matching its specified ratings.

10 kA Short-Circuit Breaking Capacity

The 5SU1344-1RC40 has a 10 kA short-circuit breaking capacity according to EN 61009-1.

The same technical data specifies:

• 10 kA according to EN 60898

• 15 kA according to IEC 60947-2

• 10 kA rated residual switching capacity according to IEC 61009-1

• Energy limitation class 3

The prospective short-circuit current at the installation point should still be verified during system design.

Combined Overcurrent and Residual-Current Protection

A conventional circuit may use:

MCB + RCCB

An RCBO combines these functions:

RCBO = Overload + Short Circuit + Residual Current Protection

This can simplify circuit-level protection and reduce the number of separate protection components in an electrical panel.

8-Module Design

The supplied product designation specifies 8 modules. The current technical data specifies 7 modular width units and a physical width of 126 mm for the device.

For the SB Smart product page, the supplied official product designation “8 modules” can be retained in the product title, while the physical modular-width information can be shown separately.

The module designation refers to physical panel space and does not represent a power rating.

Physical Dimensions

The Siemens technical data specifies approximately:

• Height: 90 mm

• Width: 126 mm

• Depth: 70 mm

• Installation depth: 70 mm

• Modular width units: 7

• Mounting position: Any

These dimensions are useful for panel builders when checking DIN-rail and enclosure space.

DIN-Rail / Modular Installation

The Siemens 5SU1 RCBO family is designed for modular electrical installation.

The 5SU1344-1RC40 can be integrated into suitable:

• Distribution boards

• Industrial control panels

• PCC panels

• MCC panels

• Commercial switchboards

• Machine panels

• Factory electrical enclosures

Installation should follow Siemens' current mounting and wiring instructions.

Neutral Conductor Switching

The technical data specifies neutral conductor switching.

This supports the four-pole arrangement used in compatible three-phase-plus-neutral systems.

Flexible Power-Supply Connection

The power-supply connection can be positioned either at the top or bottom.

This provides flexibility during electrical-panel wiring.

Overload Protection

The overcurrent section protects the connected circuit against sustained excessive current caused by overload.

The 40 A rating should be coordinated with:

• Cable ampacity

• Connected load

• Installation method

• Ambient temperature

• Protection-coordination requirements

Short-Circuit Protection

The RCBO also provides integrated short-circuit protection.

Its 10 kA EN 61009-1 breaking capacity should be evaluated against the prospective fault current at the installation point.

Residual-Current Protection

Residual current occurs when part of the electrical current flows through an unintended path, such as leakage toward earth.

The RCBO monitors this condition and disconnects the protected circuit when the specified 30 mA threshold is reached.

This adds residual-current protection to the integrated overload and short-circuit functions.

C-Curve Industrial Applications

The C characteristic can be suitable for compatible loads with moderate starting or inrush current.

Potential applications include:

• Pumps

• Fans

• Motors

• Solenoids

• Contactors

• Control transformers

• Industrial machinery

• Automation equipment

The actual suitability depends on the connected load and protection coordination.

Type AC Applications

Type AC protection can be suitable for compatible circuits carrying sinusoidal AC residual currents.

For equipment containing rectifiers, variable-speed drives or other power electronics, the required residual-current type should be verified before selecting Type AC.

Three-Phase Distribution Applications

The 5SU1344-1RC40 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

Protection Coordination

A typical arrangement can be:

Incoming Supply → RCBO → Protected Three-Phase Load

The complete protection design should consider:

• Prospective short-circuit current

• Cable capacity

• Load current

• C-curve characteristics

• 30 mA residual-current sensitivity

• Upstream protection

• Applicable electrical standards

Maintenance and Testing

RCBOs should be included in an appropriate electrical inspection and testing program.

The device's test function should be operated according to Siemens' instructions and applicable maintenance requirements to verify residual-current operation.

Installation Considerations

Before selecting the 5SU1344-1RC40, verify:

• Rated current: 40 A

• Residual-current sensitivity: 30 mA

• Residual-current type: Type AC

• Tripping characteristic: C

• Pole configuration: 4-pole

• Rated voltage: 415 V AC

• Operating frequency: 50 Hz

• Short-circuit breaking capacity: 10 kA according to EN 61009-1

• Panel space requirements

• Cable size and installation method

• Load inrush characteristics

• Applicable national installation regulations

Important Country-Specific Installation Note

The exact Siemens product description explicitly states:

“Use of these devices is not permitted in all countries. Observe national installation regulations!”

This warning should be retained on the SB Smart product page because the permitted use of this RCBO depends on the electrical installation rules applicable in the country of installation.

For India, the installer should verify the applicable Indian requirements and Siemens' current product documentation before installation.

Difference from 40 A Type A Version

The 5SU1344-7RC40 is the corresponding 40 A, 4-pole, 7-module, C-characteristic, Type A, 30 mA configuration.

Therefore:

5SU1344-1RC40 → Type AC, 40 A, 30 mA

5SU1344-7RC40 → Type A, 40 A, 30 mA

The main differences are the residual-current type and modular configuration.

Difference from D-Characteristic Version

The 5SU1344-2RC40 is the corresponding 40 A, 4-pole, 8-module, D-characteristic, Type AC, 30 mA configuration.

Therefore:

5SU1344-1RC40 → C characteristic

5SU1344-2RC40 → D characteristic

The principal difference is the overcurrent tripping characteristic.

Difference from 100 mA Type AC Version

A Type AC C-characteristic 40 A RCBO with 100 mA residual-current sensitivity belongs to a different 5SU1 configuration.

Therefore:

5SU1344-1RC40 → 40 A, Type AC, 30 mA

The residual-current sensitivity should always be checked before selecting an alternative.

Difference from 300 mA Type AC Version

The 5SU1644-1RC40 is the corresponding 40 A, 4-pole, C-characteristic, Type AC, 300 mA configuration.

Therefore:

5SU1344-1RC40 → 40 A, Type AC, 30 mA

5SU1644-1RC40 → 40 A, Type AC, 300 mA

The principal difference is the residual-current operating threshold.

Difference from 32 A Version

The corresponding 32 A Type AC C-characteristic 30 mA version belongs to the same product family.

Therefore:

5SU1344-1RC32 → 32 A

5SU1344-1RC40 → 40 A

The main difference is rated current.

Difference from 63 A Version

The corresponding 63 A Type AC C-characteristic 30 mA version is used where the protected circuit requires a higher rated current.

Therefore:

5SU1344-1RC40 → 40 A

5SU1344-1RC63 → 63 A

The correct current rating must match the protected circuit and conductor capacity.

Difference from 2-Pole RCBO

The Siemens 5SU1354 and 5SU1624 ranges include 2-pole RCBOs for compatible single-phase applications.

The 5SU1344-1RC40 is a 4-pole device intended for compatible three-phase-plus-neutral circuits.

The pole configuration should therefore be checked carefully before selecting a replacement.

Difference Between RCBO and RCCB

The 5SU1344-1RC40 is an RCBO.

An RCCB primarily provides residual-current protection and normally requires separate overcurrent protection.

An RCBO combines:

Residual-current protection + overload protection + short-circuit protection

in one device.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 5SU1344-1RC40 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 and 30 mA sensitivity.

Technical Specification

These specifications are taken from the current technical data for 5SU1344-1RC40.

Key Features

• Siemens SENTRON / Betagard 5SU1 RCBO

• Article number 5SU1344-1RC40

• 40 A rated current

• 4-pole configuration

• 8-module product designation

• Type AC residual-current protection

• 30 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 rated residual switching capacity

• Neutral conductor switching

• Touch protection

• Top or bottom power-supply connection

• Integrated overload and short-circuit protection

• Integrated residual-current protection

• Suitable for compatible three-phase-plus-neutral circuits

• National installation regulations must be observed

Benefits

• Combined protection: Integrates overload, short-circuit and residual-current protection.

• 40 A rating: Suitable for compatible three-phase circuits and feeders.

• Type AC protection: Designed for compatible sinusoidal AC residual currents.

• 30 mA sensitivity: Provides residual-current protection at the specified threshold.

• C characteristic: Suitable for compatible loads with moderate inrush current.

• 4-pole design: Suitable for compatible three-phase-plus-neutral systems.

• Compact modular construction: Suitable for distribution boards and electrical panels.

• 10 kA 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.

Why Choose Siemens 5SU1344-1RC40?

The Siemens 5SU1344-1RC40 combines 40 A overcurrent protection, C-curve tripping and Type AC 30 mA residual-current protection in a 4-pole RCBO.

The exact Siemens data confirms 415 V AC, 50 Hz, 40 A, 4-pole configuration, Type AC, 30 mA sensitivity, C characteristic 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, 30 mA three-phase circuit protection with C characteristic across India.

The country-use warning should remain visible on the product page because Siemens explicitly states that use is not permitted in all countries and national installation regulations must be observed.

Delivery 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.

Frequently Asked Questions

1. What is Siemens 5SU1344-1RC40?

The 5SU1344-1RC40 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 40 A, with 4 poles, C characteristic, Type AC residual-current protection and 30 mA sensitivity.

2. Is this an RCBO or RCCB?

It is an RCBO, meaning it combines residual-current and overcurrent protection.

3. What is the rated current?

The rated current is 40 A.

4. What is the residual-current sensitivity?

The rated residual operating current is 30 mA.

5. What type of residual-current protection does it use?

It uses Type AC residual-current protection.

6. What is the tripping characteristic?

It has a C tripping characteristic.

7. How many poles does it have?

It has 4 poles, suitable for compatible three-phase-plus-neutral applications.

8. What is the module width?

The product designation specifies 8 modules, while the technical data lists 7 modular width units and a physical width of 126 mm.

9. What is the rated voltage?

The exact Siemens data specifies 415 V AC at 50 Hz.

10. What is the short-circuit breaking capacity?

The specified short-circuit breaking capacity is 10 kA according to EN 61009-1.

11. Is this product permitted in every country?

No. Siemens explicitly states that use of these devices is not permitted in all countries and that national installation regulations must be observed.

12. What is the difference between 5SU1344-1RC40 and 5SU1344-2RC40?

5SU1344-1RC40: 40 A, 4-pole, Type AC, 30 mA, C characteristic.

5SU1344-2RC40: 40 A, 4-pole, Type AC, 30 mA, D characteristic.

The main difference is the overcurrent tripping characteristic.

13. What is the difference between 5SU1344-1RC40 and 5SU1344-7RC40?

5SU1344-1RC40: Type AC, 40 A, 30 mA, C characteristic.

5SU1344-7RC40: Type A, 40 A, 30 mA, C characteristic.

The main difference is the residual-current type.

14. What is the difference between 5SU1344-1RC40 and 5SU1644-1RC40?

5SU1344-1RC40: 40 A, Type AC, 30 mA.

5SU1644-1RC40: 40 A, Type AC, 300 mA.

The principal difference is the residual-current sensitivity.

15. Where can I buy Siemens 5SU1344-1RC40 in India?

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.