Pronto Energy 
KNB2-63S3 AC Miniature Circuit Breaker (MCB)
The KNB2-63S3 4P 32-63A AC miniature circuit breaker protects final and distribution circuits against overload and short circuit. Compliant with IEC/EN 60898-1, it delivers reliable breaking performance for residential, commercial and light-industrial electrical installations.
Wiring Diagram
Technical Parameter
| Parameter | Value |
| Compliant with standards | IEC/EN 60898-1 |
| Application | AC distribution circuits (protection against overload and short circuit; infrequent switching) |
| Number of product poles | 4P |
| Rated working voltage | 415 V AC |
| Rated frequency | 50/60 Hz |
| Frame current | 63 A |
| Rated working current | 32–63A |
| Release type | B, C, D |
| Making and breaking capacity | 10 kA |
| Mechanical life | 10,000 operations |
| Electrical life | 4,000 operations |
| Indication | OFF (green) / ON (red) / Fault trip (yellow) |
| Installation method | 35 mm standard DIN rail |
| Module width | 71.2 mm (4 × 17.8 mm module) |
| Protection level | IP20 |
| Certifications | CB, CE, SEMKO |
Standards & certifications
The KNB2-63S3 is designed in accordance with IEC/EN 60898-1 and is available with CB, CE, SEMKO certifications. Certification documentation can be provided according to project and destination-market requirements.
- Standard: IEC/EN 60898-1.
- Certifications: CB, CE, SEMKO.
- Protection level: IP20 (where applicable).
OEM & B2B supply support
KORLEN supports distributors, OEM manufacturers, electrical contractors and project buyers with product selection, samples, technical documentation and commercial quotations.
If the KNB2-63S3 configuration does not match your project, send us the required specifications, quantity and destination market. Our team can help identify a suitable configuration.
- Samples available for product evaluation.
- Flexible quantities for project and B2B purchasing.
- OEM and ODM support for suitable projects.
- Technical documentation and certification support available.
Frequently Asked Questions
The KNB2-63S3 AC MCB is designed for overload and short-circuit protection in compatible AC distribution circuits, protecting wiring, appliances and connected equipment.
The KNB2-63S3 provides 10kA breaking capacity under the applicable test conditions, which should be selected according to the prospective short-circuit current at the installation point.
Type B, C and D trip curves are available for different load and inrush-current requirements. The correct curve should be selected according to the connected load.
The KNB2-63S3 is designed for installation on standard 35mm DIN rail inside compatible modular distribution boards.
Yes. Samples and OEM/ODM support are available for suitable B2B projects. Send your electrical specifications and quantity for a quotation.
