C11B3TM063L Schneider Molded Case Circuit Breaker

C11B3TM063L is a 63A Molded Case Circuit Breaker (MCCB) of Schneider’s ComPacT NSXm series, a new generation of miniaturized power distribution protection component integrated with adjustable thermomagnetic trip protection and high-reliability breaking capacity. It is suitable for industrial/commercial low-voltage power distribution systems. Below is a comprehensive parameter analysis, scenari applicativi, installation and wiring instructions, and alternative models of this type, meeting the requirements for selection, replacement and operation in an all-round way.

1. Full Interpretation of Model Coding (Core Key for Quick Parameter Understanding)

The model coding of Schneider’s NSXm series consists of letters and numbers, with each segment corresponding to core performance. The breakdown of C11B3TM063L is as follows:

2. Parametri tecnici fondamentali (Complete Specifications)

3. Application Scenarios and Selection Adaptation

3.1 Core Application Scenarios

Protection of branch circuits in 400V three-phase low-voltage power distribution systems (per esempio., workshop power cabinets, building distribution boxes);

Protection of medium and small motor circuits (suitable for a single three-phase asynchronous motor ≤30kW or a circuit with the total power of multiple motors ≤30kW);

Power distribution protection for power equipment such as air conditioners and water pumps in commercial buildings (per esempio., centri commerciali, office buildings);

Switchgears requiring a compact design (per esempio., control boxes with limited space, outdoor box-type substations), where the NSXm series saves installation space.

3.2 Key Points for Selection Adaptation

The long-term operating current of the circuit ≤63A and the short-term starting current ≤10In (630UN) to avoid magnetic trip false operation;

The short-circuit fault current ≤25kA (at 415V). If the on-site short-circuit current ＞25kA, upgrade to a model with Class F breaking capacity (Icu=36kA) (per esempio., C11F3TM063L);

For motor circuits, it is recommended to set the thermal trip value to 0.95~1.0 times the motor’s rated current to ensure accurate overload protection;

If neutral line protection is required, select a 4P model (per esempio., C11B4TM063L) suitable for three-phase four-wire power distribution circuits.

4. Installation and Wiring Specifications (Key Operations for Accuracy and Safety)

4.1 Installation Requirements

1. Metodo di montaggio: For fixed installation, the thickness of the mounting plate ≥2mm and the screw tightening torque ≥12N·m; for plug-in/draw-out installation, ensure proper insertion and no looseness;
2. Installation Position: Install vertically inside the switchgear, keep a distance of ≥30mm from heating elements (per esempio., contattori, thermal overload relays) to ensure good heat dissipation;
3. Operation Space: The circuit breaker’s operating handle is exposed, and a minimum operation space of 50mm is reserved for convenient switching on/off and fault indication checking.

4.2 Specifiche di cablaggio

4.3 Commissioning Key Points for Protection Functions

Thermal overload protection: Set the value to 0.9~1.0 times the rated current of the circuit; the circuit breaker shall trip within 2h when simulating an overload (1.3In);

Protezione da cortocircuito: The circuit breaker shall trip instantly (≤0.1s) to interrupt the fault current when simulating a short circuit (10In);

Mechanical operation: Perform switching on/off operations 10 volte, check that the circuit breaker has no jamming or abnormal noise, and the trip indication is normal.

5. Extended Models of the Same Series (Optional as Required)

If the basic C11B3TM063L model cannot meet functional requirements, the extended models of Schneider’s NSXm series with the same specifications are as follows:

6. Cross-Brand Alternative Models (Direct Replacement with Matched Parameters)

The following are the direct replacement models of C11B3TM063L from brands such as ABB and Siemens, with completely matched current, breaking capacity and trip characteristics, adapting to the installation dimensions of the original switchgear:

7. Core Safety Notes
8. Power-off Operation for Installation/Maintenance: All installation, wiring and replacement operations must be carried out with the primary circuit completely powered off; hang a “No Switching On” warning sign to prevent electric shock;
9. Specification for Trip Unit Adjustment: Before adjusting the thermal overload setting value, confirm the load type of the circuit; the setting value for motor circuits ≤ the motor’s rated current, and the setting value for power distribution circuits ≤ the calculated current of the circuit;
10. Avoid Overload Operation: The long-term operating current of the circuit is strictly prohibited to exceed 63A, otherwise it will cause overheating and shortened service life of the circuit breaker, and even trigger safety accidents;
11. Regular Maintenance and Inspection: Check the temperature of wiring terminals monthly (≤60℃ is normal), inspect the reliability of switching on/off operations quarterly, and conduct a short-circuit protection test annually to ensure the effectiveness of protection functions.