Product Description

Siemens Betagard Residual Current Breaker Operator – Type AC with C Characteristic

The Siemens Betagard Residual Current Breaker Operator (RCBO), Type AC with C characteristic is designed to provide combined electrical protection against overcurrent and residual-current faults in low-voltage distribution systems. The Betagard 5SU1 range combines residual-current protection with overcurrent protection in a compact modular device, making it suitable for individual circuit protection in residential, commercial and industrial electrical installations.

The Type AC residual-current function is designed for compatible sinusoidal AC residual currents, while the C tripping characteristic is suitable for circuits where normal operation may involve moderate starting or inrush currents.

Siemens' Betagard 5SU1 range includes multiple current and residual-current variants, with Type AC C-characteristic versions available in different configurations such as 2-pole and 4-pole devices. Siemens documentation identifies the range under IS 12640 / IEC 61009 requirements and specifies a 240/415 V AC, 50 Hz product family.

Betagard Type AC C-Characteristic RCBO

The Siemens Betagard 5SU1 RCBO combines the functions of a conventional miniature circuit breaker and residual-current protective device into one product.

It provides three main protective functions:

• Overload protection

• Short-circuit protection

• Residual-current protection

This integrated design can simplify electrical-panel construction and reduce the number of separate protection devices required for individual circuits.

The Siemens Type AC C-characteristic range includes multiple rated-current and residual-current configurations, allowing selection according to the requirements of the protected circuit.

Type AC Residual Current Protection

The Type AC characteristic is designed for compatible sinusoidal alternating residual currents.

This type of residual-current protection is suitable for electrical circuits where the expected leakage current is compatible with Type AC detection.

Before selecting the device, the connected equipment should be evaluated to determine whether Type AC, Type A or another residual-current characteristic is required.

C Tripping Characteristic

The C characteristic is designed for circuits that can experience moderate starting or inrush currents during normal operation.

Potential applications include:

• Small motors

• Pumps

• Fans

• Contactors

• Solenoids

• Control transformers

• Selected lighting circuits

• Industrial auxiliary equipment

The C characteristic should always be selected based on the actual load, cable protection requirements and system coordination.

Integrated Overcurrent Protection

Unlike a conventional RCCB, the Betagard RCBO also provides overcurrent protection.

The overcurrent protection section is intended to protect the circuit against:

Overload → Excessive sustained current

Short Circuit → High fault current

This makes the RCBO suitable for dedicated circuit protection without necessarily requiring a separate MCB for the same circuit.

Residual Current Protection

Residual current can occur when electrical current flows through an unintended path, such as leakage toward earth.

The RCBO detects the residual-current condition and disconnects the protected circuit when the specified operating threshold is reached.

Betagard Type AC C-characteristic products are available with different residual-current sensitivities, including 30 mA, 100 mA and 300 mA configurations depending on the selected model.

The exact sensitivity should always be selected according to the electrical protection design.

Available Current Ratings

The Siemens Betagard Type AC C-characteristic family includes multiple rated-current options.

For the 2-pole range, Siemens documentation lists Type AC C-characteristic devices with current ratings such as 32 A, 40 A and 63 A, while the 2-module 1P+N range also includes lower-current devices such as 6 A, 10 A, 16 A, 20 A, 25 A, 32 A and 40 A depending on the residual-current rating.

For the 4-pole range, Siemens lists 32 A, 40 A and 63 A versions with different residual-current sensitivities.

Therefore, the exact article number should always be verified before ordering or replacing a device.

2-Pole and 4-Pole Configurations

Betagard Type AC C-characteristic RCBOs are available in different pole configurations.

2-Pole / 1P+N

Suitable for compatible single-phase applications where phase and neutral are incorporated into the protection arrangement.

Typical applications include:

• Single-phase distribution boards

• Commercial circuits

• Building electrical systems

• Equipment feeders

• Control circuits

• Industrial auxiliary circuits

4-Pole

Suitable for compatible three-phase-plus-neutral applications.

Typical applications include:

• Three-phase distribution boards

• Industrial feeder circuits

• PCC panels

• MCC panels

• Machine power circuits

• Commercial three-phase installations

The pole configuration must be matched to the electrical system.

240/415 V AC Product Family

Siemens' Betagard 5SU1 documentation identifies the product family for 240/415 V AC, 50 Hz applications.

Generally, lower-voltage single-phase variants are used in suitable 240 V class circuits, while four-pole versions are intended for suitable 415 V three-phase-plus-neutral systems.

The actual rated voltage and configuration must always be checked against the exact MLFB before installation.

Short-Circuit Protection

The Betagard 5SU1 RCBO family is specified as a 10 kA class product family in Siemens' product documentation.

The actual prospective short-circuit current at the installation point must still be checked, and the protection device must be appropriately coordinated with the electrical system.

Modular Design

Betagard 5SU1 RCBOs are designed for modular electrical distribution systems.

The compact modular construction allows installation in:

• Distribution boards

• Electrical control panels

• Commercial switchboards

• Industrial panels

• Building electrical enclosures

• Machine control panels

Siemens documentation uses MW (Module Width) to identify physical module requirements, with 1 MW = 18 mm.

Industrial Applications

The Type AC C-characteristic Betagard RCBO range can be used for compatible:

• Industrial auxiliary circuits

• Control panels

• Automation equipment

• Small motor circuits

• Pump circuits

• Fan circuits

• Machine auxiliary supplies

• Equipment feeders

For electronic loads, the residual-current waveform should be considered before selecting Type AC.

Commercial and Building Applications

The Betagard RCBO range is also suitable for compatible:

• Commercial distribution boards

• Office electrical circuits

• Building services

• Equipment supply circuits

• Small machinery

• Lighting circuits

• Dedicated electrical feeders

The correct rated current, residual-current sensitivity and pole configuration should be selected according to the circuit requirements.

Difference Between RCBO and RCCB

A conventional RCCB primarily provides residual-current protection and normally needs a separate overcurrent protective device.

An RCBO combines:

Residual Current Protection + Overload Protection + Short-Circuit Protection

The Betagard 5SU1 RCBO therefore provides integrated circuit protection in one device.

Selection Considerations

Before selecting a Siemens Betagard Type AC C-characteristic RCBO, verify:

• Rated current

• Pole configuration

• Residual-current sensitivity

• Type AC requirement

• C tripping characteristic

• Rated voltage

• Short-circuit level

• Cable size

• Load inrush current

• Panel space

• Applicable electrical regulations

The exact MLFB/article number is important because products with similar descriptions may have different ratings and characteristics.

Why Choose Siemens Betagard 5SU1 RCBO?

Siemens Betagard 5SU1 RCBOs provide an integrated solution for circuit-level electrical protection. The Type AC C-characteristic range offers multiple combinations of rated current, residual-current sensitivity and pole configuration, allowing electrical contractors and panel builders to select a suitable device for their application. Siemens documentation also identifies the family under IS 12640 / IEC 61009 standards.

For SB Smart, the Betagard Type AC C-characteristic RCBO range can be positioned as a Siemens solution for single-phase and three-phase circuit protection across residential, commercial and industrial applications.

Key Features

• Siemens Betagard / SENTRON 5SU1 RCBO

• Type AC residual-current protection

• C tripping characteristic

• Integrated overload protection

• Integrated short-circuit protection

• Integrated residual-current protection

• 2-pole and 4-pole variants

• Multiple rated-current options

• Multiple residual-current sensitivity options

• Modular electrical-panel installation

• 240/415 V AC family

• 50 Hz product family

• 10 kA class RCBO range

• Designed according to applicable RCBO standards

Benefits

• Integrated protection: Combines residual-current and overcurrent protection in one device.

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

• Multiple variants: Allows selection based on current, sensitivity and pole configuration.

• Space saving: Modular construction can reduce panel component count.

• Industrial suitability: Useful for control panels, equipment feeders and auxiliary circuits.

• Easy circuit protection: Provides dedicated protection for individual electrical circuits.

• Siemens Betagard platform: Provides a recognized industrial electrical protection solution.

Why Buy Betagard RCBO from SB Smart?

SB Smart supplies Siemens Betagard / SENTRON RCBOs, RCCBs, MCBs and industrial electrical protection products for electrical panel builders, OEMs, contractors and industrial buyers.

Products can be sourced for delivery across Faridabad, Delhi NCR, Gurgaon/Gurugram, Noida, Haryana, Punjab, Mumbai, Pune, Ahmedabad, Bengaluru, Hyderabad, Chennai and other major Indian cities.

For an exact product page, the complete Siemens MLFB/SKU should be specified, because the Betagard Type AC C-characteristic range contains multiple current and residual-current variants. SB Smart's own product catalogue also lists multiple 5SU1 Type AC C-characteristic articles.

Frequently Asked Questions

1. What is a Betagard Residual Current Breaker Operator?

A Siemens Betagard Residual Current Breaker Operator is an RCBO that combines residual-current protection with overcurrent protection.

2. What does Type AC mean?

Type AC indicates residual-current protection intended for compatible sinusoidal alternating residual currents.

3. What does C characteristic mean?

The C tripping characteristic is intended for compatible circuits where moderate inrush current may occur during normal operation.

4. Is Betagard RCBO the same as an RCCB?

No. An RCBO combines residual-current and overcurrent protection, while an RCCB primarily provides residual-current protection.

5. What voltage range is covered by the Betagard 5SU1 family?

Siemens documentation identifies the family for 240/415 V AC, 50 Hz applications, depending on the particular configuration.

6. Are 2-pole and 4-pole versions available?

Yes. Siemens documentation lists both 2-pole and 4-pole Type AC C-characteristic variants.

7. Which residual-current sensitivities are available?

Depending on the exact model, the Betagard Type AC C-characteristic range includes 30 mA, 100 mA and 300 mA variants.

8. What is the short-circuit rating?

The 5SU1 Betagard range is specified as a 10 kA RCBO family.

9. Can Type AC be used for every electronic load?

No. Electronic equipment may generate residual-current waveforms that require Type A, Type F or Type B protection. The connected equipment characteristics should be checked before selecting the RCBO type.

10. What should I check before ordering?

Check the complete Siemens article number, rated current, pole configuration, residual-current sensitivity, Type AC characteristic, C curve, rated voltage and required module width.

11. Is this suitable for industrial applications?

Yes, suitable variants can be used in compatible industrial control panels, equipment feeders, automation systems, machine auxiliaries and distribution boards.

12. Where can I buy Siemens Betagard Type AC C-characteristic RCBOs in India?

SB Smart supplies Siemens Betagard/SENTRON RCBOs and industrial electrical protection products across India for panel builders, electrical contractors, OEMs, industrial buyers and maintenance requirements.