Product Description

Siemens 5SU1644-1RC32 RCBO – 32A, 4-Pole, 300mA, Type AC, C-Characteristic

The Siemens 5SU1644-1RC32 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 is 32 A, 4-pole, 8 modules, C characteristic, Type AC, 300 mA. Siemens documentation includes 5SU1644-1RC32 in the 5SU1 4-pole RCBO range, while Indian product data confirms the specific 32 A, Type AC, 300 mA and C-curve configuration.

Siemens 5SU1644-1RC32 RCBO

The 5SU1644-1RC32 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family. Unlike a conventional RCCB, an RCBO combines multiple protection functions within one device:

• Overload protection

• Short-circuit protection

• Residual-current protection

This integrated construction can simplify electrical-panel design and provide dedicated protection for a three-phase circuit.

Siemens' documentation lists the exact article 5SU1644-1RC32 within the 4-pole 5SU1 RCBO product family.

32 A Rated Current

The 5SU1644-1RC32 has a rated current of 32 A.

This makes it suitable for compatible three-phase circuits and feeders designed around a 32 A protective device.

The actual selection should consider:

• Connected load

• Cable ampacity

• Installation method

• Ambient conditions

• Prospective short-circuit current

• Protection coordination requirements

Indian product data confirms the 32 A rating for the exact article.

C Tripping Characteristic

The RCBO uses a C tripping characteristic.

A C-curve device is intended for circuits where normal operation can involve moderate starting or inrush current.

Potential applications include compatible:

• Motors

• Pumps

• Fans

• Control transformers

• Contactors

• Solenoids

• Industrial equipment

• Selected lighting and electronic loads

The C characteristic should be selected according to the actual load characteristics and protection-coordination requirements.

Type AC Residual Current Protection

The 5SU1644-1RC32 uses Type AC residual-current protection.

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

The residual-current waveform of the connected equipment should be considered before selecting the protection type. Equipment that produces pulsating DC or other residual-current components may require a different RCCB/RCBO type.

Indian product data confirms the exact article as Type AC.

300 mA Residual Current Sensitivity

The RCBO has a rated residual operating current of 300 mA.

When the residual-current condition reaches the applicable 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 replaced with a 30 mA device because the two values serve different protection requirements.

The exact product data confirms 300 mA residual-current sensitivity.

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 electrical panels

• Machine power circuits

• Factory electrical systems

• Sub-distribution boards

415 V AC Application

Indian product information for the exact 32 A article identifies the device for 415 V AC applications, while the product-family technical data uses the relevant IEC low-voltage ratings for the 5SU1 range.

For the SB Smart product page, the 415 V AC market designation can be retained. The actual installation voltage should always be checked against the applicable Siemens technical documentation and electrical-system design.

10 kA Short-Circuit Breaking Capacity

The exact Indian technical listing identifies the 5SU1644-1RC32 with a 10 kA breaking capacity.

The prospective short-circuit current at the installation point should still be checked during system design, along with upstream protection and coordination requirements.

Since this is an RCBO, the device incorporates overcurrent protection as part of its construction.

Combined Overcurrent and Residual-Current Protection

The main advantage of the 5SU1644-1RC32 is its integrated protection arrangement.

A conventional installation may use:

MCB + RCCB

An RCBO combines these protective functions:

RCBO = Overload + Short Circuit + Residual Current Protection

This can simplify circuit-level protection and reduce the need for separate overcurrent and residual-current devices.

8-Module Design

The supplied product description specifies 8 modules.

The module designation refers to the physical installation space required within a modular electrical panel and does not represent an 8 MW power rating.

The four-pole construction and integrated protection functions make adequate panel space important during installation.

Indian product information identifies the exact article as an 8-module RCBO.

DIN-Rail and Panel Installation

The 5SU1 RCBO family is designed for modular electrical-panel applications.

The 5SU1644-1RC32 can be integrated into appropriately sized:

• Distribution boards

• Electrical control panels

• PCC panels

• MCC panels

• Industrial switchboards

• Commercial electrical enclosures

• Machine panels

Panel builders should verify available space and compatibility with the selected installation accessories.

Overload Protection

The RCBO's overcurrent section provides protection against sustained excessive current resulting from circuit overload.

The 32 A rating should be coordinated with:

• Cable size

• Load current

• Installation method

• Ambient temperature

• Protection requirements

This helps ensure proper circuit protection during normal and abnormal operating conditions.

Short-Circuit Protection

The integrated overcurrent protection also provides short-circuit protection.

The 10 kA breaking capability should be evaluated against the prospective fault current at the installation point.

Correct coordination with the upstream electrical system remains important even though the RCBO incorporates overcurrent protection.

Residual-Current Protection

Residual current occurs when a portion of current flows outside its intended electrical path, such as through an unintended leakage path to earth.

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

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

C-Curve Industrial Applications

The C characteristic is suitable for selected loads with moderate starting or inrush currents.

Potential applications include:

• Pumps

• Fans

• Motors

• Control transformers

• Solenoids

• Contactors

• Industrial automation equipment

• Selected machinery

The actual tripping characteristic should be selected according to the load's starting current and protection-coordination requirements.

Type AC Load Compatibility

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

The 5SU1644-1RC32 should therefore be selected where the connected equipment is compatible with Type AC residual-current protection.

For modern power-electronic equipment, the leakage-current waveform should be checked before selecting Type AC instead of Type A, Type F or Type B protection.

Three-Phase Distribution Applications

The 5SU1644-1RC32 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 circuit arrangement can be:

Incoming Supply → RCBO → Protected Three-Phase Load

Because the RCBO integrates overcurrent protection, the design should still consider:

• Prospective short-circuit current

• Cable capacity

• Load current

• C-curve characteristics

• Residual-current sensitivity

• Upstream protection

• Applicable standards

Maintenance and Testing

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

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

Regular testing helps confirm that the protective mechanism remains operational.

Installation Considerations

Before selecting the 5SU1644-1RC32, verify:

• Rated current: 32 A

• Residual-current sensitivity: 300 mA

• Residual-current type: Type AC

• Tripping characteristic: C

• Pole configuration: 4-pole

• System voltage compatibility

• Prospective short-circuit current

• Required panel space: 8 modules

• Cable size and installation method

• Load inrush characteristics

• Applicable electrical regulations

Difference from D-Characteristic Version

The 5SU1644-2RC32 is the corresponding 32 A, 4-pole, Type AC, 300 mA RCBO with a D characteristic. Siemens India product information confirms the D-curve variant with the same rated current, pole count, residual-current type and sensitivity.

Therefore:

5SU1644-1RC32 → C characteristic

5SU1644-2RC32 → D characteristic

The principal difference is the overcurrent tripping characteristic. The D curve is intended for compatible loads with higher starting or inrush currents.

Difference from 40 A Version

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

Therefore:

5SU1644-1RC32 → 32 A

5SU1644-1RC40 → 40 A

The main difference is the rated current.

Difference from 63 A Version

The 5SU1644-1RC63 is the corresponding 63 A, 4-pole, Type AC, 300 mA, C-characteristic version.

Therefore:

5SU1644-1RC32 → 32 A

5SU1644-1RC40 → 40 A

5SU1644-1RC63 → 63 A

The correct rated current should be selected according to the protected circuit.

Difference from Type A Version

The 5SU1644-7RC32 is a Type A variant in the same 5SU1 product family, while 5SU1644-1RC32 is specifically Type AC.

Therefore:

5SU1644-1RC32 → Type AC, C characteristic, 32 A, 300 mA

5SU1644-7RC32 → Type A, C characteristic, 32 A, 300 mA

The main difference is the residual-current type.

Difference from Type A D-Curve Version

The 5SU1644-8RC32 is a Type A, D-characteristic, 32 A, 300 mA variant with a different modular configuration. Indian product data identifies it as a Type A 32 A, 300 mA D-curve RCBO.

Therefore, the exact article number should be checked for both residual-current type and tripping characteristic.

Difference from 30 mA Version

The 5SU1644-1RC32 is specifically a 300 mA RCBO.

Where a circuit design requires a 30 mA residual-current threshold, a different article must be selected. A lower sensitivity should not be substituted without confirming the protection requirements.

Difference from 2-Pole Version

The 5SU1624 and 5SU1654 series contain other 2-pole RCBO configurations.

The 5SU1644-1RC32 is a 4-pole device intended for compatible three-phase-plus-neutral protection, so the pole configuration should be checked carefully when selecting an exact replacement.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 5SU1644-1RC32 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 C characteristic.

Technical Specification

The exact Indian product data confirms 32 A, 4-pole, 8 modules, C characteristic, Type AC, 300 mA and 10 kA for the article 5SU16441RC32.

Key Features

• Siemens SENTRON / Betagard 5SU1 RCBO

• Article number 5SU1644-1RC32

• 32 A rated current

• 4-pole configuration

• 8-module installation designation

• Type AC residual-current protection

• 300 mA residual-current sensitivity

• C tripping characteristic

• 415 V AC India-market designation

• 50 Hz operating frequency

• 10 kA breaking capacity

• Integrated overload protection

• Integrated short-circuit protection

• Integrated residual-current protection

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

• Suitable for industrial and commercial electrical panels

Benefits

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

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

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

• 8-module format: Provides a dedicated modular solution for the four-pole RCBO.

• Siemens 5SU1 platform: Provides a standardized integrated circuit-protection solution.

Why Choose Siemens 5SU1644-1RC32?

The Siemens 5SU1644-1RC32 combines 32 A overcurrent protection, C-curve tripping and Type AC 300 mA residual-current protection in a four-pole RCBO.

The exact Indian product data confirms the combination of 32 A, 4-pole, 8 modules, C characteristic, Type AC and 300 mA, with a 10 kA breaking capacity.

It is suitable for customers looking to buy or source Siemens 5SU1 RCBOs for three-phase distribution boards, industrial feeders, machine circuits, electrical panels and commercial installations in India.

For SB Smart, this product is best presented as a Siemens Betagard/SENTRON 5SU1 Type AC RCBO for 32 A, 300 mA three-phase circuit protection with C 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 5SU1644-1RC32?

The 5SU1644-1RC32 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 32 A, with 4 poles, C 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 C tripping characteristic.

7. How many poles does it have?

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

8. What does 8 modules mean?

8 modules refers to the product's market-facing modular installation designation. It indicates panel space and does not mean an 8 MW power rating.

9. What is the rated voltage?

Indian product information identifies the article for 415 V AC applications.

10. What is the short-circuit breaking capacity?

The exact product listing specifies a 10 kA breaking capacity.

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

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

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

The main difference is the overcurrent tripping characteristic.

12. Where can I buy Siemens 5SU1644-1RC32 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.