The ABN403C 400A aptomat LS MCCB 3P 400A 42kA is a robust three-pole molded case circuit breaker designed for demanding protection in industrial and commercial installations. Its high breaking capacity and precise trip characteristics make it suitable for main switchboards where safety and continuity are critical.
This component combines proven electromechanical design with modern diagnostics support, providing reliable fault interruption and clear status indication. Engineers can rely on its standardized mounting and wiring options for seamless integration into new or retrofit projects.
| Model | Type | Rated Current | Breaking Capacity |
|---|---|---|---|
| ABN403C | MCCB 3P | 400 A | 42 kA |
| Frame Size | Aptomat LS | 400 A Frame | High energy limitation |
| Poles | Three-pole | Frequency | 50/60 Hz |
| Short-circuit rating | 42 kA | Enclosure | IP20 |
Electrical Performance and Operating Conditions
Voltage and Current Ratings
The ABN403C operates within standard voltage ranges for three-phase systems, with a nominal current of 400 A aligned to the 400A aptomat LS platform. It maintains stable performance under varying load conditions while preserving the 42kA breaking capacity.
Environmental Tolerance
Designed for demanding environments, the breaker tolerates wide temperature ranges and moderate humidity. Proper ventilation and adherence to installation guidelines ensure consistent operation and long service life.
Mechanical Installation and Wiring Guidelines
Mounting and Enclosure Fit
The compact design supports DIN rail and panel mounting, allowing efficient use of switchboard space. Verify enclosure dimensions and access clearance before finalizing the layout.
Wiring and Connection Methods
Use appropriately sized conductors and secure torque settings to match manufacturer specifications. Reliable connections reduce resistive heating and support optimal performance of the 400A aptomat LS system.
Protection Features and Diagnostics
Short-circuit and Overload Protection
The magnetic and thermal tripping units provide fast interruption for short-circuit events and gradual response for overloads. This dual protection strategy safeguards cables, motors, and downstream equipment.
Status Indicators and Communication
Position indicators and auxiliary contacts enable remote monitoring and integration with building management systems. Select optional communication modules where digital supervision is required.
Specifications and Final Recommendations
- Verify system voltage and frequency match the rated 400 A 3P configuration.
- Confirm available short-circuit energy at the point of installation.
- Ensure adequate ventilation and accessibility for maintenance.
- Use calibrated torque tools for terminal connections.
- Coordinate selective tripping with upstream devices.
FAQ
Reader questions
What is the main application for the ABN403C 400A aptomat LS MCCB 3P 400A 42ka?
It is primarily used in industrial and commercial panel boards where high short-circuit breaking capacity and reliable three-phase protection for 400 A loads are required.
Can this breaker be used in a multi-level power distribution system?
Yes, it is suitable for main distribution boards and feeder applications, provided upstream and downstream coordination is verified.
How does the 42 kA breaking capacity affect selection for my installation?
The 42 kA rating ensures safe interruption of prospective short-circuit currents, allowing use in installations with high available fault levels without additional series restriction.
What are the key dimensions and mounting options for the aptomat LS series?
Check the product datasheet for precise cutout dimensions, depth requirements, and DIN rail compatibility to ensure mechanical fit within your enclosure.