ABB TMAX T4S 320A Molded Case Circuit Breaker (Industrial-Grade Overcurrent Protection)

The ABB 1SDA054126R1 TMAX T4S 320 is a high-performance molded case circuit breaker engineered to deliver robust overcurrent and short-circuit protection in industrial power distribution networks. Designed for 3-pole applications with 400V AC operation and an impressive 50kA breaking capacity, this MCCB combines advanced electronic trip technology with compact construction to safeguard critical electrical infrastructure across manufacturing plants, commercial facilities, and industrial installations.

Built for reliability in harsh operating environments, the TMAX T4S 320 addresses the growing demand for intelligent circuit protection that integrates seamlessly with modern building automation systems. Whether you're upgrading legacy switchgear or designing new distribution panels, this circuit breaker provides the precision, durability, and flexibility required for mission-critical applications.

With its electronic trip unit offering customizable protection curves and communication-ready architecture, the TMAX T4S 320 empowers facility managers and electrical engineers to optimize system coordination, reduce downtime, and maintain compliance with international safety standards including IEC 60947-2.

Core Features & Technical Advantages

→ 50kA Breaking Capacity at 400V
Exceptional fault interruption capability ensures safe disconnection even under severe short-circuit conditions, protecting downstream equipment and personnel from electrical hazards.

→ Electronic Trip Unit with Adjustable Settings
Precision current monitoring and programmable protection parameters enable selective coordination with upstream/downstream devices, minimizing nuisance tripping while maximizing system availability.

→ Compact Fixed-Terminal Design
Space-efficient footprint reduces panel real estate requirements by up to 30% compared to legacy MCCBs, while front-accessible terminals simplify installation and maintenance procedures.

→ 3-Pole Configuration for Balanced Load Protection
Simultaneous monitoring of all three phases prevents phase imbalance issues and ensures comprehensive protection for motors, transformers, and distribution feeders.

→ IP20 Protection Class
Suitable for indoor switchgear installations with protection against solid objects larger than 12.5mm, meeting standard electrical room requirements.

→ Communication Module Compatibility
Optional Ekip Com modules enable integration with SCADA systems, building management platforms, and remote monitoring solutions for predictive maintenance and energy management.

Industrial Application Scenarios

✓ Motor Control Centers (MCC)
Protects individual motor feeders in industrial automation systems, preventing costly equipment damage from overload conditions while enabling coordinated motor starting sequences. Reduces unplanned downtime by 40% through precise trip coordination.

✓ Main Distribution Boards
Serves as primary protection for building electrical distribution systems in commercial complexes, hospitals, and data centers. Ensures business continuity by isolating faults without affecting healthy circuits.

✓ Transformer Secondary Protection
Safeguards step-down transformers in industrial facilities, preventing thermal damage and extending transformer service life by 25-35% through accurate overload detection.

✓ Manufacturing Process Lines
Provides dedicated circuit protection for automated production equipment, CNC machines, and robotic systems where sudden power interruption could result in product defects or safety incidents.

✓ Renewable Energy Installations
Integrates into solar inverter systems and wind turbine control panels, offering reliable DC-rated protection options and compatibility with energy storage systems.

Technical Parameters & Selection Guide

Selection Criteria:
When specifying the TMAX T4S 320, verify that the prospective short-circuit current at the installation point does not exceed 50kA. For applications requiring higher breaking capacity, consider the TMAX T5 or T6 series. Ensure ambient temperature correction factors are applied when operating above 40°C. Consult ABB's DOCWin coordination software to validate selective discrimination with upstream protection devices and downstream branch circuit breakers.

Extended Functionality & Integration Options

Communication & Monitoring:
The TMAX T4S platform supports Ekip Com communication modules enabling Modbus RTU, Profibus DP, and Ethernet/IP connectivity. Real-time data acquisition includes current measurements, energy consumption, power quality parameters, and alarm notifications—critical for Industry 4.0 implementations and predictive maintenance strategies.

Auxiliary Contact Modules:
Expand functionality with auxiliary contacts (1NO+1NC configurations), shunt trip coils for remote disconnection, undervoltage releases for voltage-dependent protection, and motor operators for automated switching in load transfer applications.

Customization Capabilities:
ABB offers factory-configured solutions including custom trip settings, special terminal arrangements, and pre-wired control circuits to accelerate panel assembly and reduce field commissioning time by 50%.

Delivery Timeline & Service Commitment

Standard Lead Time: 3-5 business days for stock items
Custom Configurations: 10-15 business days for factory-programmed units
Express Shipping: Available for critical replacement scenarios

Warranty Coverage: 18-month comprehensive warranty covering manufacturing defects and performance deviations from published specifications

Technical Support: Lifetime access to our engineering team for application assistance, coordination studies, and troubleshooting guidance. Phone and email support available Monday-Friday, 8:00 AM - 6:00 PM CST.

Documentation Package: Each unit ships with installation manual, dimensional drawings, trip curve charts, and certificate of conformity. CAD files and BIM objects available for download.

Frequently Asked Questions

Q: How do I configure the electronic trip unit settings for my specific application?
A: The Ekip electronic trip unit is programmable via front-panel interface or ABB's Ekip Connect software. You can adjust long-time (L), short-time (S), instantaneous (I), and ground fault (G) protection parameters. We recommend consulting the trip unit manual or contacting our technical team for application-specific settings to ensure optimal coordination.

Q: Can this MCCB be used in DC applications or solar installations?
A: The standard 1SDA054126R1 is rated for AC applications only. For DC circuits (solar, battery systems), ABB offers DC-rated versions within the TMAX T4 family with appropriate voltage and current ratings. Contact us to specify the correct DC model for your renewable energy project.

Q: What is the difference between Icu and Ics breaking capacity ratings?
A: Icu (ultimate breaking capacity) is the maximum fault current the breaker can safely interrupt once. Ics (service breaking capacity) represents the fault current level the breaker can interrupt multiple times while remaining serviceable. The TMAX T4S 320 offers 100% Ics/Icu ratio (both 50kA), meaning it maintains full performance even after breaking maximum fault currents.

Q: How do I ensure proper selective coordination with downstream branch breakers?
A: Use ABB's free DOCWin software to perform time-current coordination studies. Input your system parameters, upstream and downstream protective devices, and the software will verify selective discrimination. Our engineering team can also provide coordination study services upon request.

Q: Is remote monitoring and control possible with this circuit breaker?
A: Yes, by adding an Ekip Com communication module, you can integrate the TMAX T4S into building management systems (BMS), SCADA networks, or cloud-based monitoring platforms. This enables remote status monitoring, energy metering, alarm notifications, and even remote trip/close operations when combined with a motor operator.

Q: What maintenance procedures are recommended for long-term reliability?
A: Perform annual visual inspections for terminal tightness, contact wear, and enclosure integrity. Every 3-5 years, conduct operational testing including manual trip tests and contact resistance measurements. The electronic trip unit is maintenance-free but should be functionally tested during scheduled outages. Detailed maintenance procedures are provided in the product manual.

Take the Next Step

Ready to enhance your electrical distribution system with proven ABB circuit protection technology? Our technical sales team is standing by to assist with product selection, coordination studies, and custom configuration requirements.

Contact us today:
→ Request a formal quotation with volume pricing
→ Schedule a technical consultation for your project
→ Download CAD drawings and technical documentation
→ Inquire about stock availability and expedited shipping

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