Product Description

Siemens 5SU1444-1RC63 RCBO – 63A, 4-Pole, 100mA, Type AC, C-Characteristic

The Siemens 5SU1444-1RC63 is a SENTRON / Betagard 5SU1 Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to combine overload, short-circuit and residual-current protection in a single device. The exact Siemens product is specified as a 63 A, 4-pole, 8-module, C-characteristic, Type AC, 100 mA RCBO. Siemens product data confirms 10 kA breaking capacity, while Indian product listings specify 415 V AC operation.

Siemens 5SU1444-1RC63 RCBO

The 5SU1444-1RC63 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family. Unlike a conventional RCCB, an RCBO combines multiple protective functions in one device:

• Overload protection

• Short-circuit protection

• Residual-current protection

This integrated design can simplify circuit-level protection and reduce the need for separate MCB and RCCB devices.

The exact Siemens product description identifies the article as RCBO 63 A, 4-pole, 8 modules, C characteristic, Type AC, 100 mA.

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 selection should consider cable capacity, connected load, installation method, ambient conditions and applicable electrical regulations.

C Tripping Characteristic

The 5SU1444-1RC63 uses a C tripping characteristic.

The C curve is intended for compatible circuits where normal operation may involve moderate starting or inrush current.

Potential applications include:

• Pumps

• Fans

• Motors

• Control transformers

• Contactors

• Solenoids

• Industrial auxiliary equipment

• Selected machinery

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

Type AC Residual Current Protection

The RCBO uses Type AC residual-current protection.

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

The actual leakage-current waveform of the connected equipment should be considered before selecting the RCBO type. For equipment capable of producing pulsating DC or other residual-current components, a different residual-current type may be required.

The exact article is identified as Type AC.

100 mA Residual Current Sensitivity

The 5SU1444-1RC63 has a rated residual operating current of 100 mA.

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

The 100 mA sensitivity should be selected according to the complete electrical protection design. It should not automatically be replaced with a 30 mA or 300 mA device because different residual-current thresholds serve different protection requirements.

The exact product data confirms 100 mA sensitivity.

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

415 V AC Application

Indian product information specifies the 5SU1444-1RC63 for 415 V AC applications.

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 product is specified with a 10 kA breaking capacity.

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

Because the device is an RCBO, its overcurrent section also provides short-circuit protection within its specified ratings.

Combined Overcurrent and Residual-Current Protection

The main advantage of the 5SU1444-1RC63 is its integrated protection arrangement.

A conventional circuit may use:

MCB + RCCB

An RCBO combines these functions:

RCBO = Overload + Short Circuit + Residual Current Protection

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

8-Module Product Designation

The supplied product description specifies 8 modules, and Indian product listings use the same market-facing designation.

The current Siemens technical data gives the device a physical width of 126 mm and lists 7 modular width units.

For the SB Smart product page, the market-facing 8-module description can be retained while the physical dimensions and modular-width data are shown separately.

Physical Dimensions

The current data sheet specifies approximately:

• Height: 90 mm

• Width: 126 mm

• Depth: 70 mm

• Installation depth: 70 mm

• Number of modular width units: 7

• Net weight: approximately 960 g

These dimensions are useful for panel builders when checking enclosure space.

Neutral Conductor Switching

The technical data confirms neutral conductor switching.

This supports the four-pole protection arrangement used in suitable three-phase-plus-neutral applications.

Flexible Power-Supply Connection

The current technical data specifies that the power supply can be connected from either the top or bottom.

This provides practical flexibility during panel wiring.

Overload Protection

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

The 63 A rating should be coordinated with:

• Cable ampacity

• Connected load

• Installation method

• Ambient temperature

• Protection-coordination requirements

Short-Circuit Protection

The integrated overcurrent section also provides short-circuit protection.

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

Residual-Current Protection

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

The RCBO monitors the residual-current condition and disconnects the circuit when the specified 100 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

• Control transformers

• Solenoids

• Contactors

• Industrial machinery

• Selected automation equipment

The actual suitability depends on the load starting characteristics and protection coordination.

Type AC Load Compatibility

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

The 5SU1444-1RC63 should therefore be selected where the connected equipment is compatible with Type AC residual-current detection.

For modern power-electronic equipment, the required residual-current type should be verified before selection.

Three-Phase Distribution Applications

The 5SU1444-1RC63 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

Protection Coordination

A typical arrangement can be:

Incoming Supply → RCBO → Protected Three-Phase Load

The overall design should consider:

• Prospective short-circuit current

• Cable capacity

• Load current

• C-curve characteristics

• 100 mA residual-current sensitivity

• 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 correct residual-current operation.

Regular testing helps confirm that the protective mechanism remains operational.

Installation Considerations

Before selecting the 5SU1444-1RC63, verify:

• Rated current: 63 A

• Residual-current sensitivity: 100 mA

• Residual-current type: Type AC

• Tripping characteristic: C

• Pole configuration: 4-pole

• Rated voltage: 415 V AC

• Operating frequency

• Short-circuit breaking capacity: 10 kA

• Required panel space

• Cable size and installation method

• Load inrush characteristics

• Applicable electrical regulations

Difference from 30 mA Version

The 5SU1444-1RC63 is specifically a 100 mA RCBO.

A 30 mA version is a different product configuration and should not be used as a direct replacement unless the protection design requires a 30 mA threshold.

Difference from 300 mA Version

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

Therefore:

5SU1444-1RC63 → 63 A, 100 mA

5SU1644-1RC63 → 63 A, 300 mA

The principal difference is the residual-current operating threshold.

Difference from Type A Version

The 5SU1444-7RC63 belongs to the Type A variant of the 5SU1 family, while the 5SU1444-1RC63 is specifically Type AC.

Therefore:

5SU1444-1RC63 → Type AC, 63 A, 100 mA, C

5SU1444-7RC63 → Type A, 63 A, 100 mA, C

The key difference is the residual-current type.

Difference from D-Characteristic Version

A D-characteristic RCBO is intended for compatible circuits with higher starting or inrush currents.

The 5SU1444-1RC63 specifically uses a C characteristic, so the D-curve alternative should only be selected where the load characteristics justify it.

Difference from 40 A Version

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

The 5SU1444-1RC63 is specifically intended for a 63 A circuit-protection requirement.

Difference from 32 A Version

The corresponding 32 A variant has a lower rated current while retaining the relevant Type AC, C-characteristic and residual-current configuration.

Therefore, the correct rated current must be matched to the circuit and cable design.

Difference from 4-Pole RCCB

Unlike an RCCB, the 5SU1444-1RC63 is an RCBO, so it integrates overcurrent protection together with residual-current protection.

This can reduce the need for separate MCB and RCCB devices for the protected circuit.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 5SU1444-1RC63 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 and 100 mA sensitivity.

These values are taken from the current technical data for 5SU1444-1RC63.

Key Features

• Siemens SENTRON / Betagard 5SU1 RCBO

• Article number 5SU1444-1RC63

• 63 A rated current

• 4-pole configuration

• Type AC residual-current protection

• 100 mA residual-current sensitivity

• C tripping characteristic

• 415 V AC rated voltage

• 10 kA breaking capacity

• 50/60 Hz compatible product family

• Neutral conductor switching

• Top or bottom power-supply connection

• Compact modular construction

• Integrated overload and short-circuit protection

• Integrated residual-current protection

Benefits

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

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

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

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

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

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

• 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 5SU1444-1RC63?

The Siemens 5SU1444-1RC63 combines 63 A overcurrent protection, C-curve tripping and Type AC 100 mA residual-current protection in a four-pole RCBO.

The exact product data confirms the 63 A rating, 4-pole configuration, C characteristic, Type AC, 100 mA sensitivity and 10 kA breaking capacity.

For SB Smart, this product is best presented as a Siemens Betagard/SENTRON 5SU1 Type AC RCBO for 63 A, 100 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 5SU1444-1RC63?

The 5SU1444-1RC63 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 63 A, with 4 poles, C characteristic, Type AC residual-current protection and 100 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 100 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?

Indian product information specifies 415 V AC.

9. What is the short-circuit breaking capacity?

The specified breaking capacity is 10 kA.

10. What is the difference between 5SU1444-1RC63 and 5SU1644-1RC63?

5SU1444-1RC63: 63 A, 4-pole, Type AC, C characteristic, 100 mA

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

The main difference is the residual-current sensitivity.

11. What is the difference between 5SU1444-1RC63 and a Type A version?

5SU1444-1RC63: Type AC, 100 mA.

A Type A equivalent has different residual-current detection characteristics and should be selected based on the connected equipment.

12. Where can I buy Siemens 5SU1444-1RC63 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.