Description

Used product. The ABB SACE S3N is a 3-pole molded-case circuit breaker (MCCB) designed for the protection and isolation of power circuits in industrial applications and distribution switchboards.
Based on the photographs and technical nameplate, the unit has a rated current of Iu = 250 A and a rated operating voltage of up to 690 V AC. The device is equipped with an adjustable trip unit, with thermal protection adjustable from 175–250 A and a magnetic threshold specified as Im = 2500 A.
The compact and robust construction of the ABB SACE S3N series is suitable for industrial installations requiring high operating currents, protection against overloads and short circuits, and manual circuit isolation.

⚙️ Technical Specifications

• Manufacturer: ABB SACE
• Series: S3N
• Type: Molded-case circuit breaker (MCCB)
• Poles: 3P
• Rated current Iu: 250 A
• Rated operating voltage Ue: up to 690 V AC
• Frequency: 50–60 Hz
• Standard: IEC 60947-2
• Additional standard indicated on nameplate: GB14048.2
• Utilization category: Category A
• DC voltage indicated on nameplate: 250 V
• Adjustable thermal protection: 175–250 A
• Magnetic threshold Im: 2500 A
• Ics: 100% of Icu
• Configuration: 3-pole
• Operating mechanism: Front rotary control
• Installation: Industrial electrical equipment and switchboards

⚡ Breaking Capacity

The nameplate of the photographed unit clearly indicates:

• 400/415 V AC: Icu = 35 kA
• 690 V AC: Icu = 14 kA
• Ics = 100% of Icu

Therefore, for the specific photographed configuration, the device has a short-circuit breaking capacity of 35 kA at 400/415 V AC and 14 kA at 690 V AC.

These values should not be extended to other operating voltages unless the corresponding rating is clearly confirmed by the nameplate or applicable ABB documentation.

🔧 Protection and Adjustments

The device features adjustable settings accessible on the lower section of the trip-unit assembly.

The visible markings indicate:

Ith (40°C): 175…250 A
Im: 2500 A

The adjustable thermal setting allows the protection to be adapted to the line current within the range provided by the device.

The circuit breaker provides protection against overloads and short circuits, together with the possibility of manual circuit isolation using the front rotary operating mechanism.

🏭 Construction and Installation

The ABB SACE S3N features a molded insulated housing, three independent poles, and front power terminals.

The front rotary mechanism provides practical operation for opening and closing the circuit breaker and incorporates a visual indication of its operating position.

The construction is intended for installation inside electrical switchboards, distribution systems, industrial installations, and power equipment.

🌐 Applications

The ABB SACE S3N 250 A, subject to verification of electrical compatibility and trip-unit configuration, can be used for:

• Industrial electrical switchboards
• Three-phase line protection
• Low-voltage electrical distribution
• Industrial motor and machinery protection, when correctly coordinated
• Automation and distribution panels
• Power supply systems for high-consumption equipment
• Isolation of circuits up to 690 V AC

🛡️ Safety and Product Condition

The component is used and shows normal signs of previous installation and use visible in the photographs, with no obvious structural damage to the housing.

Before recommissioning, professional inspection is recommended, including:

• Continuity testing of all three poles
• Electrical insulation testing
• Verification of correct opening and closing mechanism operation
• Correct reset operation
• Trip-unit operation
• Verification of the 175–250 A / Im 2500 A settings
• Terminal condition and tightening
• Inspection for signs of overheating or internal deterioration

Electrical operation is not confirmed solely on the basis of the photographs. As a protective device intended for high currents, it must be installed and tested exclusively by qualified personnel.

📦 Package Contents

• 1 × ABB SACE S3N
• 3-pole, 250 A molded-case circuit breaker
• Front rotary operating mechanism, as shown in the photographs

🚀 Final Description

The ABB SACE S3N 250 A is a 3-pole, 250 A molded-case circuit breaker (MCCB) designed for the protection and isolation of industrial low-voltage circuits up to 690 V AC. The unit features Iu 250 A, Category A, compliance with IEC 60947-2, adjustable thermal protection from 175–250 A, and a magnetic threshold of Im 2500 A.

The specific nameplate indicates a breaking capacity Icu of 35 kA at 400/415 V AC and 14 kA at 690 V AC, with Ics equal to 100% of Icu.

It is suitable as a protection and isolation device for industrial switchboards, three-phase lines, and power equipment, and may be particularly useful as an original ABB SACE replacement component for existing installations, subject to compatibility verification.

Used component, sold in the configuration and cosmetic condition shown in the photographs.