Product Description

Siemens 5SU1644-2RC32 RCBO – 32A, 4-Pole, 300mA, Type AC, D-Characteristic

The Siemens 5SU1644-2RC32 is a SENTRON / Betagard 5SU1 Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to provide overload, short-circuit and residual-current protection in a single device. The exact Siemens India product listing identifies the article as RCBO 32 A, 4-pole, 8 modules, D characteristic, Type AC, 300 mA. Siemens currently lists 5SU1644-2RC32 as an active product.

Siemens 5SU1644-2RC32 RCBO

The 5SU1644-2RC32 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family. An RCBO combines the functions of an overcurrent protective device and a residual-current protective device in one integrated product.

The device therefore provides protection against:

• Overload

• Short circuit

• Residual or earth-leakage current

This integrated construction can simplify electrical-panel design compared with using separate MCB and RCCB devices.

The exact product description from Siemens India confirms the configuration as 32 A, 4-pole, 8 modules, D characteristic, Type AC and 300 mA.

32 A Rated Current

The RCBO has a rated current of 32 A.

This makes it suitable for compatible three-phase circuits where the protective device is required to carry a nominal current of 32 A.

The circuit design should consider cable size, connected load, installation conditions, ambient temperature and applicable electrical requirements.

D Tripping Characteristic

The 5SU1644-2RC32 uses a D tripping characteristic.

A D-curve protective device is intended for circuits that can experience comparatively high short-duration inrush currents during normal operation.

Potential applications can include compatible:

• Motors

• Transformers

• Compressors

• Solenoid loads

• Industrial machinery

• High-inrush equipment

The D characteristic should be selected only where the load's starting current and the complete protection-coordination design justify it.

Type AC Residual Current Protection

The RCBO uses Type AC residual-current protection.

Type AC devices are intended for compatible sinusoidal alternating residual currents.

For equipment that can produce pulsating DC or other residual-current waveforms, a different residual-current type may be required. The connected equipment characteristics should therefore be considered before selecting the RCBO.

The exact Siemens India article is specified as Type AC.

300 mA Residual Current Sensitivity

The 5SU1644-2RC32 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 electrical protection design. It should not automatically be replaced with a 30 mA device because different residual-current thresholds serve different protection requirements.

4-Pole Configuration

The RCBO 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 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

8-Module Design

The supplied product description specifies 8 modules.

This means the device occupies an 8-module-wide space in a standard modular distribution arrangement. The designation refers to physical installation width and does not indicate an 8 MW power rating.

The larger width reflects the integrated four-pole RCBO construction and its protection components.

415 V AC Application

Indian product information identifies the 5SU1644-2RC32 as a 32 A, 4-pole, 415 V AC RCBO.

This makes it suitable for compatible three-phase low-voltage distribution systems where the system voltage and protection requirements match the device.

10 kA Short-Circuit Rating

The exact product listings identify the 5SU1644-2RC32 with a 10 kA breaking capacity.

The 10 kA rating should be evaluated against the prospective short-circuit current at the installation point and the complete upstream protection arrangement.

Because the RCBO includes overcurrent protection, it provides short-circuit protection as part of its integrated function.

Combined Overcurrent and Residual-Current Protection

The principal benefit of the 5SU1644-2RC32 is the combination of protection functions in one device.

A conventional arrangement can involve:

MCB + RCCB

An RCBO provides the equivalent integrated functions:

RCBO = Overload + Short Circuit + Residual Current Protection

This can simplify panel construction and provide dedicated protection for an individual three-phase circuit.

Three-Phase Distribution Applications

The 5SU1644-2RC32 can be considered for compatible applications such as:

• Industrial distribution boards

• Three-phase equipment feeders

• MCC panels

• PCC panels

• Machine power circuits

• Factory electrical systems

• Commercial three-phase panels

• Sub-distribution boards

The actual application must be determined according to the electrical design and applicable standards.

D-Curve Industrial Applications

The D characteristic makes this RCBO particularly relevant to circuits where normal equipment operation can produce high starting or inrush currents.

Potential applications include:

• Motor feeders

• Compressor circuits

• Transformer feeders

• Industrial machines

• High-inrush equipment

• Selected automation equipment

The D curve should not be chosen merely because the connected load is industrial; the actual starting-current profile and fault-protection requirements must be considered.

Type AC Load Compatibility

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

It can be appropriate for installations where the connected equipment does not generate residual-current components requiring Type A, Type F or Type B protection.

For modern power-electronic equipment, the required residual-current type should be verified from the equipment manufacturer's documentation.

Protection Against Overload

The overcurrent section of the RCBO protects the circuit from sustained excessive current.

The 32 A rating should be coordinated with the cable ampacity and connected load.

Correct selection helps ensure that the protective device operates as intended while preventing unnecessary tripping under normal operating conditions.

Short-Circuit Protection

The RCBO also incorporates short-circuit protection.

The 10 kA short-circuit capacity provides the specified interruption capability when the device is installed within its rated conditions.

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

Residual-Current Protection

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

The RCBO monitors the relevant residual-current condition and disconnects the circuit when the specified 300 mA threshold is reached.

This provides an additional protection function beyond conventional overload and short-circuit protection.

Panel and Control Applications

The 5SU1644-2RC32 can be considered for:

• Electrical control panels

• Machine panels

• Industrial distribution boards

• Commercial switchboards

• Motor-control applications

• Equipment feeders

• Automation panels

• Factory electrical systems

The final selection should be based on voltage, current, residual-current characteristics, inrush current and protection coordination.

DIN Modular Installation

The 5SU1 family is designed for modular electrical installation.

The 8-module format allows the four-pole RCBO to be integrated into appropriately sized distribution boards and electrical enclosures.

Panel builders should ensure sufficient module space and suitable busbar/accessory compatibility before installation.

Maintenance and Testing

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 inspection can help confirm that both the residual-current and overcurrent protection functions remain operational.

Installation Considerations

Before selecting the 5SU1644-2RC32, verify:

• Rated current: 32 A

• Residual-current sensitivity: 300 mA

• Residual-current type: Type AC

• Tripping characteristic: D

• Pole configuration: 4-pole

• System voltage compatibility

• Prospective short-circuit current

• Available panel space: 8 modules

• Cable size and installation method

• Load inrush characteristics

• Applicable electrical regulations

Difference from C-Characteristic Version

The 5SU1644-1RC32 is the corresponding 32 A, 4-pole, 8-module, C-characteristic, Type AC, 300 mA RCBO.

Therefore:

5SU1644-2RC32 → D characteristic

5SU1644-1RC32 → C characteristic

Both have the same 32 A, four-pole, Type AC and 300 mA configuration, but their overcurrent tripping characteristics differ.

Difference from Type A Version

The 5SU1644-8RC32 is a corresponding 32 A, 4-pole, 7-module, D-characteristic Type A, 300 mA RCBO in the Siemens range.

Therefore:

5SU1644-2RC32 → Type AC, D characteristic, 8 modules

5SU1644-8RC32 → Type A, D characteristic, 7 modules

The residual-current type and module width are both different.

Difference from 2-Pole D-Curve Version

The 5SU1624-2RC32 is a 32 A, 2-pole, 4-module, D-characteristic, Type A, 300 mA RCBO.

The 5SU1644-2RC32 is a 4-pole, 8-module, Type AC model.

Therefore, the pole configuration and residual-current type must be checked carefully before selecting a replacement.

Difference from 30 mA Version

The 5SU1644-2RC32 is specifically a 300 mA residual-current version.

Siemens 5SU1 RCBOs are available with other residual-current sensitivities, including lower thresholds.

A 30 mA RCBO should not be considered a direct replacement without confirming the protection requirement of the circuit.

Difference from 16 A and 32 A Single-Phase RCBOs

The earlier 5SU1654 RCBO variants are compact 2-pole devices for single-phase applications.

The 5SU1644-2RC32 is a 4-pole RCBO intended for compatible three-phase-plus-neutral protection, so it should not be confused with the smaller 1P+N models.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 5SU1644-2RC32 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 32 A three-phase circuit protection with D characteristic.

Technical Specification

The exact Siemens India listing confirms the article number and product description, while current Indian technical listings confirm 32 A, 4-pole, 8 modules, D characteristic, Type AC, 300 mA and 10 kA.

Key Features

• Siemens SENTRON / Betagard 5SU1 RCBO

• Article number 5SU1644-2RC32

• 32 A rated current

• 4-pole configuration

• 8-module installation width

• Type AC residual-current protection

• 300 mA residual-current sensitivity

• D tripping characteristic

• 415 V AC India product designation

• 10 kA breaking capacity

• Integrated overload and short-circuit protection

• Integrated residual-current protection

• Suitable for compatible three-phase distribution circuits

• Designed for modular electrical-panel installation

Benefits

• Combined protection: Integrates overcurrent and residual-current protection into one device.

• 32 A rating: Suitable for compatible three-phase circuits.

• D characteristic: Suitable for selected loads with higher starting or inrush current.

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

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

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

• 10 kA rating: Provides substantial short-circuit interruption capability within specified conditions.

• 8-module format: Provides a dedicated modular solution for four-pole circuit protection.

• Siemens 5SU1 platform: Provides a standardized solution for integrated electrical protection.

Why Choose Siemens 5SU1644-2RC32?

The Siemens 5SU1644-2RC32 combines 32 A overcurrent protection, D-curve tripping and Type AC 300 mA residual-current protection in a 4-pole, 8-module RCBO.

It is particularly relevant for compatible three-phase circuits where connected equipment can generate higher starting or inrush currents and where Type AC, 300 mA residual-current protection is specified.

For SB Smart, this product is best presented as a Siemens Betagard/SENTRON 5SU1 Type AC RCBO for 32 A three-phase electrical protection with D characteristic across India.

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.

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

Frequently Asked Questions

1. What is Siemens 5SU1644-2RC32?

The 5SU1644-2RC32 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 32 A, with 4 poles, 8 modules, D characteristic, Type AC residual-current protection and 300 mA sensitivity.

2. Is this an RCBO or RCCB?

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

3. What is the rated current?

The rated current is 32 A.

4. What is the residual-current sensitivity?

The rated residual operating current is 300 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 D tripping characteristic.

7. How many poles does it have?

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

8. What does 8 modules mean?

The device occupies 8 modular units of panel space. This is a physical installation-width designation and does not mean an 8 MW power rating.

9. What is the rated voltage?

The India product listing identifies the 5SU16442RC32 as 415 V AC.

10. What is the short-circuit rating?

The product is listed with a 10 kA breaking capacity.

11. What is the difference between 5SU1644-2RC32 and 5SU1644-1RC32?

5SU1644-2RC32: 32 A, 4-pole, 8 modules, D characteristic, Type AC, 300 mA.

5SU1644-1RC32: 32 A, 4-pole, 8 modules, C characteristic, Type AC, 300 mA.

12. Where can I buy Siemens 5SU1644-2RC32 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.