Product Description

Siemens 5SU1444-1RC32 RCBO – 32A, 4-Pole, 100mA, Type AC, C-Characteristic

The Siemens 5SU1444-1RC32 is a SENTRON / Betagard 5SU1 Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to combine overload, short-circuit and residual-current protection in one device. The exact product data identifies it as a 32 A, 4-pole, C-characteristic, Type AC, 100 mA RCBO for compatible three-phase-plus-neutral electrical systems. Siemens technical data specifies 415 V AC, 50 Hz, and 10 kA short-circuit breaking capacity according to EN 61009-1.

Siemens 5SU1444-1RC32 RCBO

The 5SU1444-1RC32 belongs to the Siemens SENTRON / Betagard 5SU1 RCBO family. An RCBO combines overcurrent protection and residual-current protection in a single 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 MCB and RCCB devices required.

Siemens' product documentation lists the 5SU1444-1RC32 within the 4-pole 5SU1 RCBO range.

32 A Rated Current

The RCBO 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 cable capacity, connected load, installation method, ambient conditions and applicable electrical regulations.

C Tripping Characteristic

The 5SU1444-1RC32 uses a C tripping characteristic.

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

Potential applications include:

• Pumps

• Fans

• Small motors

• Control transformers

• Contactors

• Solenoids

• Industrial auxiliary equipment

• Selected machinery

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 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. Equipment capable of producing pulsating DC or other residual-current components may require a different residual-current protection type.

The exact 5SU1444-1RC32 product data identifies the residual-current type as AC.

100 mA Residual Current Sensitivity

The 5SU1444-1RC32 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 by a 30 mA or 300 mA device because each threshold provides a different protection characteristic.

The exact technical data confirms 100 mA rated tripping fault current.

4-Pole Configuration

The RCBO has 4 poles, making it suitable for compatible three-phase plus neutral 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

The exact technical data specifies a 415 V AC supply voltage and 50 Hz operating frequency.

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

10 kA Short-Circuit Breaking Capacity

The 5SU1444-1RC32 has a specified 10 kA short-circuit current breaking capacity according to EN 61009-1. The technical data also lists 15 kA according to IEC 60947-2 for the applicable switching-capacity parameter.

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

Combined Overcurrent and Residual-Current Protection

The principal advantage of the 5SU1444-1RC32 is its integrated protection arrangement.

A conventional installation may use:

MCB + RCCB

An RCBO combines these functions:

RCBO = Overload + Short Circuit + Residual Current Protection

This can simplify circuit-level protection and reduce the number of separate protection components.

8-Module Product Designation

The supplied product description identifies this article as an 8-module RCBO.

The 8-module designation refers to the product's market-facing modular installation description and does not indicate an 8 MW power rating.

Interestingly, the current technical data lists a physical width of 126 mm and 7 modular width units for the device.

For the SB Smart product page, the supplied market designation “8 modules” can be retained in the product title, while the physical dimensions and current technical modular-width data can be shown separately.

Physical Dimensions

The technical data specifies approximately:

• Height: 90 mm

• Width: 126 mm

• Depth: 70 mm

• Installation depth: 70 mm

• Modular width units: 7

• Net weight: approximately 924 g

These details are useful for electrical panel builders when checking enclosure space.

Neutral Conductor Switching

The product data specifies neutral conductor switching.

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

Flexible Power-Supply Connection

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

This provides useful flexibility during panel wiring and installation.

Overload Protection

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

The 32 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 specified 10 kA EN 61009-1 breaking capacity should be considered 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 circuit path, such as through an unintended earth-leakage route.

The RCBO monitors the residual-current condition and disconnects the circuit when the specified 100 mA threshold is reached.

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

C-Curve Industrial Applications

The C characteristic can be suitable for compatible loads with moderate starting or inrush current.

Potential applications include:

• Pumps

• Fans

• Small motors

• Control transformers

• Solenoids

• Contactors

• Industrial machinery

• Selected automation equipment

The final selection should be based on the actual load starting characteristics and protection coordination.

Type AC Load Compatibility

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

The 5SU1444-1RC32 should therefore be selected where the connected equipment is compatible with Type AC residual-current detection.

For modern equipment containing rectifiers, variable-speed drives or power electronics, the appropriate residual-current type should be verified before selection.

Three-Phase Distribution Applications

The 5SU1444-1RC32 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 arrangement can be:

Incoming Supply → RCBO → Protected Three-Phase Load

The complete protection 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 the residual-current protection function.

Regular testing helps confirm that the protective mechanism remains operational.

Installation Considerations

Before selecting the 5SU1444-1RC32, verify:

• Rated current: 32 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: 50 Hz

• Short-circuit capacity: 10 kA according to EN 61009-1

• Panel space requirements

• Cable size and installation method

• Load inrush characteristics

• Applicable electrical regulations

Difference from 300 mA Version

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

Therefore:

5SU1444-1RC32 → 32 A, 100 mA

5SU1644-1RC32 → 32 A, 300 mA

The main difference is the residual-current operating threshold.

Difference from 30 mA Version

The 5SU1444-1RC32 is specifically a 100 mA RCBO.

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

Difference from D-Characteristic Version

The 5SU1444-2RC32 is the corresponding 32 A, 4-pole, Type AC, 100 mA RCBO with a D characteristic. Siemens' product data identifies the 2RC32 article as the D-characteristic counterpart.

Therefore:

5SU1444-1RC32 → C characteristic

5SU1444-2RC32 → D characteristic

The main difference is the overcurrent tripping characteristic.

Difference from Type A Version

The 5SU1444-7RC32 is a Type A variant in the same 5SU1 product family, while 5SU1444-1RC32 is specifically Type AC.

Therefore:

5SU1444-1RC32 → Type AC, 32 A, C, 100 mA

5SU1444-7RC32 → Type A, 32 A, C, 100 mA

The key difference is the residual-current type.

Difference from 40 A Version

The 5SU1444-1RC40 is the corresponding 40 A, 4-pole, Type AC, 100 mA, C-characteristic RCBO.

Therefore:

5SU1444-1RC32 → 32 A

5SU1444-1RC40 → 40 A

The main difference is the rated current.

Difference from 63 A Version

The 5SU1444-1RC63 is the corresponding 63 A, 4-pole, Type AC, 100 mA, C-characteristic RCBO.

Therefore:

5SU1444-1RC32 → 32 A

5SU1444-1RC40 → 40 A

5SU1444-1RC63 → 63 A

The correct rated current should be selected according to the protected circuit. Siemens documentation lists these 32 A, 40 A and 63 A Type AC variants within the 4-pole 5SU1 range.

Difference from 2-Pole Version

The 5SU1424 series includes 2-pole RCBO variants, whereas the 5SU1444-1RC32 is a 4-pole device.

Therefore:

5SU1444-1RC32 → 4-pole, suitable for compatible three-phase-plus-neutral systems

A 2-pole variant is intended for suitable single-phase protection applications.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 5SU1444-1RC32 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 and 100 mA sensitivity.

These specifications are based on the current technical data sheet for 5SU1444-1RC32.

Key Features

• Siemens SENTRON / Betagard 5SU1 RCBO

• Article number 5SU1444-1RC32

• 32 A rated current

• 4-pole configuration

• Type AC residual-current protection

• 100 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

• Integrated overload and short-circuit protection

• Integrated residual-current protection

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.

• 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 5SU1444-1RC32?

The Siemens 5SU1444-1RC32 combines 32 A overcurrent protection, C-curve tripping and Type AC 100 mA residual-current protection in a four-pole RCBO.

The exact technical data confirms 415 V AC, 50 Hz, 32 A, 4-pole configuration, C characteristic, Type AC, 100 mA residual-current sensitivity and 10 kA EN 61009-1 breaking capacity.

It is suitable for compatible three-phase electrical panels, distribution systems, equipment feeders and industrial circuits where the specified 100 mA Type AC residual-current protection is required.

For SB Smart, this product is best presented as a Siemens Betagard/SENTRON 5SU1 Type AC RCBO for 32 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 5SU1444-1RC32?

The 5SU1444-1RC32 is a Siemens SENTRON / Betagard 5SU1 RCBO rated at 32 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 32 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?

The exact technical data specifies 415 V AC.

9. What is the short-circuit breaking capacity?

The technical data specifies 10 kA according to EN 61009-1, with 15 kA according to IEC 60947-2 for the applicable switching-capacity parameter.

10. What is the difference between 5SU1444-1RC32 and 5SU1444-2RC32?

5SU1444-1RC32: 32 A, 4-pole, Type AC, 100 mA, C characteristic.

5SU1444-2RC32: 32 A, 4-pole, Type AC, 100 mA, D characteristic.

The main difference is the overcurrent tripping characteristic.

11. What is the difference between 5SU1444-1RC32 and 5SU1644-1RC32?

5SU1444-1RC32: 32 A, 4-pole, Type AC, C characteristic, 100 mA.

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

The main difference is the residual-current sensitivity.

12. Where can I buy Siemens 5SU1444-1RC32 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.