Product Description

Siemens 5SU1644-1RC63 RCBO – 63A, 4-Pole, 300mA, Type AC, C-Characteristic

The Siemens 5SU1644-1RC63 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 product designation identifies it as a 63 A, 4-pole, Type AC, 300 mA, C-characteristic RCBO for three-phase-plus-neutral applications. The current product datasheet specifies 415 V AC, 10 kA breaking capacity according to EN 61009-1, and Type AC residual-current protection.

Siemens 5SU1644-1RC63 RCBO

The 5SU1644-1RC63 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family. Unlike an RCCB, which primarily provides residual-current protection and normally requires separate overcurrent protection, an RCBO combines multiple protective functions in one device.

It provides protection against:

• Overload

• Short circuit

• Residual or earth-leakage current

This integrated design can simplify circuit-level protection and reduce the number of separate protective devices required in an electrical panel.

The exact Indian product designation identifies the device as a 63 A, 4-pole, 8-module, C-characteristic, Type AC, 300 mA RCBO.

63 A Rated Current

The RCBO has a rated current of 63 A.

This makes it suitable for compatible three-phase circuits and feeders designed around a 63 A protective device.

The final current rating should be selected according to the connected load, conductor capacity, installation method, ambient conditions and applicable electrical regulations.

C Tripping Characteristic

The 5SU1644-1RC63 uses a C tripping characteristic.

The C curve is intended for circuits where normal operation can involve moderate starting or inrush currents.

Suitable applications may 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.

Type AC Residual Current Protection

The RCBO uses Type AC residual-current protection.

Type AC devices are intended for compatible sinusoidal alternating residual currents. The residual-current characteristics of the connected equipment should always be considered before selecting the protection type.

For equipment that can produce pulsating DC or other residual-current waveforms, a different RCBO type may be required.

The exact product data identifies the residual-current type as AC.

300 mA Residual Current Sensitivity

The 5SU1644-1RC63 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 residual-current operating thresholds.

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 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

415 V AC Application

The exact technical datasheet specifies a 415 V AC supply voltage and 50 Hz operating frequency for the 5SU1644-1RC63.

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 Breaking Capacity

The technical data specifies a 10 kA short-circuit breaking capacity according to EN 61009-1. It also specifies 15 kA according to IEC 60947-2 for the relevant switching-capacity parameter.

The prospective short-circuit current at the installation point should still be evaluated during system design, and the RCBO should be installed according to the manufacturer's coordination requirements.

Combined Overcurrent and Residual-Current Protection

One of the main benefits of the 5SU1644-1RC63 is the integration of several protection functions.

A conventional circuit may use:

MCB + RCCB

An RCBO combines these functions:

RCBO = Overload + Short Circuit + Residual Current Protection

This can simplify electrical-panel architecture and provide dedicated protection to an individual three-phase circuit.

8-Module Product Designation

The supplied product description identifies the article as an 8-module RCBO. Indian listings also describe the product as an 8-module unit.

There is an important dimensional distinction in the current technical datasheet: it lists 7 modular width units and a physical width of 126 mm for the corresponding article.

Therefore, for the SB Smart product page, the official article description "8 modules" should be retained in the product title, while the physical modular-width specification should be stated separately as per the current datasheet.

Compact Industrial Panel Installation

The device is designed for modular electrical-panel installation.

With its four-pole construction and integrated RCBO functions, it can be used in appropriately sized:

• Distribution boards

• Industrial control panels

• PCC panels

• MCC panels

• Machine panels

• Commercial switchboards

• Factory electrical enclosures

The available panel space should be checked before installation.

Overload Protection

The RCBO's overcurrent protection function protects the circuit against excessive current caused by sustained overload.

The 63 A rating should be coordinated with the cable size, connected load and installation conditions.

Correct circuit coordination helps avoid both inadequate protection and unnecessary nuisance tripping.

Short-Circuit Protection

The RCBO also provides short-circuit protection.

Its specified breaking capacity should be considered against the prospective fault current at the point of installation. The current datasheet specifies 10 kA according to EN 61009-1.

Residual-Current Protection

Residual current occurs when part of the electrical current flows outside its intended circuit path, such as through an unintended earth-leakage path.

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

This provides residual-current protection in addition to the integrated overload and short-circuit protection.

Three-Phase Distribution Applications

The 5SU1644-1RC63 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 be determined according to the electrical design and applicable standards.

C-Curve Industrial Applications

The C characteristic makes the device suitable for compatible loads where moderate starting current or inrush current can occur.

Potential applications include:

• Small and medium motor circuits

• Pumps

• Fans

• Control transformers

• Solenoids

• Industrial machinery

• Selected automation equipment

The actual suitability depends on the load's starting characteristics and protection-coordination requirements.

Type AC Load Compatibility

Type AC protection is intended for compatible sinusoidal AC residual currents.

The 5SU1644-1RC63 should therefore be selected where the connected equipment is compatible with Type AC residual-current detection.

For modern equipment incorporating rectifiers, variable-speed drives or power electronics, the appropriate residual-current type should be verified from the equipment documentation.

Protection Coordination

A typical circuit arrangement can be:

Incoming Supply → RCBO → Protected Three-Phase Load

Because the RCBO already integrates overcurrent protection, the complete installation still needs to be coordinated with the upstream protective arrangement and system fault level.

Correct coordination should consider:

• Prospective short-circuit current

• Cable capacity

• Load current

• RCBO characteristics

• Upstream protection

• Applicable electrical standards

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 testing helps confirm that the protective mechanism remains operational.

Installation Considerations

Before selecting the 5SU1644-1RC63, verify:

• Rated current: 63 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

• Required panel space

• Cable size and installation method

• Connected equipment characteristics

• Applicable electrical regulations

Difference from D-Characteristic Version

The 5SU1644-2RC63 is the corresponding 63 A, 4-pole, Type AC, 300 mA RCBO with a D characteristic.

Therefore:

5SU1644-1RC63 → C characteristic

5SU1644-2RC63 → D characteristic

The principal difference is the overcurrent tripping characteristic.

The C curve is intended for moderate inrush applications, while the D curve is intended for circuits with higher starting or inrush currents.

Difference from Type A Version

A Type A variant should be selected where the installation requires detection of suitable residual currents containing pulsating DC components.

The 5SU1644-1RC63 is specifically Type AC, so it should not be directly substituted with a Type A or Type B device without checking the residual-current characteristics of the connected equipment.

Difference from 300 mA / Type A Version

The Siemens 5SU1 range contains Type A RCBO variants with similar current and characteristic combinations.

The key distinction for this article is:

5SU1644-1RC63 → Type AC + C characteristic + 63 A + 300 mA

This combination should be checked carefully when sourcing an exact replacement.

Difference from 30 mA Version

The 5SU1644-1RC63 is specifically a 300 mA residual-current device.

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

Difference from 32 A Version

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

Therefore:

5SU1644-1RC32 → 32 A

5SU1644-1RC63 → 63 A

The principal difference is the rated current.

Difference from C-Characteristic 40 A Version

A lower-current variant should be selected where the protected circuit requires less than 63 A.

The 5SU1644-1RC63 is specifically selected for circuits requiring a 63 A C-characteristic Type AC RCBO with 300 mA sensitivity.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 5SU1644-1RC63 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 63 A three-phase circuit protection with C characteristic.

Technical Specification

The exact product datasheet provides these technical values for 5SU1644-1RC63. Indian product listings identify the marketed product as 63 A, 4-pole, 8 modules, Type AC, 300 mA, C characteristic, 415 V AC.

Key Features

• Siemens SENTRON / Betagard 5SU1 RCBO

• Article number 5SU1644-1RC63

• 63 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

• Modular electrical-panel installation

Benefits

• Combined protection: Provides overload, short-circuit and residual-current protection in one RCBO.

• 63 A rating: Suitable for compatible higher-current three-phase circuits.

• 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 configuration: Suitable for compatible three-phase-plus-neutral circuits.

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

• Neutral switching: Supports phase and neutral circuit switching.

• Flexible power supply: Power can be connected from the top or bottom according to the product design.

Why Choose Siemens 5SU1644-1RC63?

The Siemens 5SU1644-1RC63 combines 63 A overcurrent protection, C-curve tripping and Type AC 300 mA residual-current protection in a four-pole RCBO.

The exact technical datasheet confirms 415 V AC operation, 50 Hz frequency, 300 mA residual-current sensitivity, C characteristic, 4-pole configuration and 10 kA EN 61009-1 short-circuit breaking capacity.

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

For SB Smart, this product is best presented as a Siemens Betagard/SENTRON 5SU1 Type AC RCBO for 63 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 5SU1644-1RC63?

The 5SU1644-1RC63 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 63 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 and overcurrent protection in one device.

3. What is the rated current?

The rated current is 63 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 is the rated voltage?

The exact datasheet specifies 415 V AC rated supply voltage and 50 Hz frequency.

9. What is the short-circuit breaking capacity?

The datasheet specifies 10 kA according to EN 61009-1 and 15 kA according to IEC 60947-2 for the relevant switching-capacity specification.

10. What is the difference between 5SU1644-1RC63 and 5SU1644-2RC63?

5SU1644-1RC63: 63 A, 4-pole, C characteristic, Type AC, 300 mA.

5SU1644-2RC63: 63 A, 4-pole, D characteristic, Type AC, 300 mA.

The main difference is the overcurrent tripping characteristic.

11. What is the difference between 5SU1644-1RC63 and 5SU1644-1RC32?

5SU1644-1RC63: 63 A, 4-pole, Type AC, 300 mA, C characteristic.

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

The main difference is the rated current.

12. Where can I buy Siemens 5SU1644-1RC63 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.