Used product. The ABB SACE Tmax T4D 250 is a molded-case circuit breaker (MCCB) designed for industrial applications and electrical power systems, with a rated current of 250 A and a rated operational voltage of up to 690 V AC.
The device is equipped with a YO shunt trip, with a control voltage of 24–30 V AC or 24–30 V DC, allowing the circuit breaker to be opened by means of a remote electrical command.
The component shows normal signs of previous use, including light abrasions and superficial marks on the external surfaces and hardware. The control wiring connected to the YO shunt trip is also present, as shown in the photographs.
⚙️ Technical Specifications
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Brand: ABB
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Series: SACE Tmax
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Model: T4D 250
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Type: Molded-Case Circuit Breaker (MCCB)
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Rated Current: 250 A
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Rated Operational Voltage Ue: up to 690 V
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Insulation Voltage Ui: 800 V
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Rated Impulse Withstand Voltage Uimp: 8 kV
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Standard: IEC 60947-3
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AC Utilization Category: AC-23A
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Frequency: 50–60 Hz
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Rated Current: 250 A
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Shunt Trip: YO
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YO Voltage: 24–30 V AC, 50–60 Hz
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YO DC Voltage: 24–30 V DC
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Construction: ABB SACE Tmax equipment
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Indicated Origin: Made in Italy
The nameplate also indicates configurations for DC applications, including DC23A and connection of 2 poles in series.
⚡ Function in the Electrical System
The Tmax T4D 250 is used for the protection and interruption of electrical power circuits.
The circuit breaker allows the user to:
- Interrupt the circuit under abnormal conditions covered by the protection system
- Manually open and close the circuit
- Integrate remote control and tripping systems
- Isolate electrical circuits during maintenance operations
- Protect lines and electrical equipment designed for currents up to 250 A, according to the specific system configuration
The YO shunt trip allows the circuit breaker to be electrically opened through an external control circuit operating at 24–30 V AC/DC.
🏭 Construction & Installation
The device features the typical compact construction of the ABB SACE Tmax family, with a high-strength insulating body and front ON/OFF operating mechanism.
The assembly also includes the connections associated with the YO shunt trip, with external control wiring visible in the photographs.
Installation must be carried out by qualified personnel, with prior verification of:
- Rated current of the circuit
- Operating voltage
- Connection diagram
- Conductor sizing
- Required breaking capacity of the electrical system
- Correct power supply for the 24–30 V AC/DC YO shunt trip
🌐 Applications
The ABB SACE Tmax T4D 250 is suitable for industrial electrical distribution and automation applications, including:
- Industrial electrical panels
- Low-voltage distribution
- Line and load protection
- Automation systems
- Industrial machinery
- Control systems with remote tripping
- Electrical systems requiring electrically commanded remote opening
Thanks to the YO shunt trip, it can be integrated into systems where the circuit breaker must be opened through a remote electrical command.
💡 Key Advantages
- 250 A rated current
- Operational voltage up to 690 V
- Ui 800 V
- Uimp 8 kV
- Industrial ABB SACE Tmax construction
- Integrated YO shunt trip
- YO control voltage 24–30 V AC/DC
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Remote tripping capability
- Suitable for AC and DC applications according to the specified configuration
- Robust construction for use in industrial electrical panels
🛡️ Safety & Product Condition
⚠️ WARNING: EQUIPMENT INTENDED FOR ELECTRICAL POWER CIRCUITS.
The circuit breaker must be installed and tested exclusively by qualified personnel, in accordance with the characteristics of the electrical system and applicable safety requirements.
The component is used and shows signs of previous installation, mainly on the external surfaces, terminals, and hardware.
The correct operation of the main contacts, opening/closing mechanism, and YO shunt trip cannot be certified from the photographs alone. Before selling it as a fully functional component, a complete mechanical and electrical inspection is therefore recommended, including a 24–30 V AC/DC shunt-trip test.
📦 Package Contents
- 1 × ABB SACE Tmax T4D 250
- 1 × YO Shunt Trip 24–30 V AC/DC
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Control wiring present, as shown in the photographs
🚀 Final Description
The ABB SACE Tmax T4D 250 is a 250 A molded-case circuit breaker, designed for industrial electrical distribution and protection applications with voltages up to 690 V.
The presence of the 24–30 V AC/DC YO shunt trip makes it particularly interesting as a replacement component for industrial electrical panels and systems requiring the possibility of electrically controlled remote opening.
The component is offered as used, with normal signs of previous installation. For sale as a fully operational device, a functional test of the operating mechanism and YO shunt trip is recommended.
