Pronto Energy 
KNB1-125 AC Miniature Circuit Breaker (MCB)
The KNB1-125 2P 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.
Applications & circuit protection
The KNB1-125 is designed for AC distribution circuits requiring dependable overload and short-circuit protection. Its compact modular construction suits distribution panels, commercial buildings, industrial equipment and OEM electrical assemblies.
- Final and branch circuit protection in distribution boards
- Residential and commercial lighting and socket circuits
- Light-industrial equipment and control panels
- OEM modular electrical assemblies
Construction & operating reliability
The KNB1-125 combines robust terminals, high-conductivity contacts and an arc-control chamber for dependable operation. A clear status indication helps electricians identify ON, OFF and fault-trip states quickly.
- High-conductivity silver-alloy contacts with tin-plated copper conductors
- Multi-plate arc extinguishing chamber for fast arc suppression
- 3-colour status window for fast fault identification
- Flame-retardant housing with IP20 protection
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 | 2P |
| Rated working voltage | 415 V AC |
| Rated frequency | 50/60 Hz |
| Frame current | 125 A |
| Rated working current | 63A |
| Release type | 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 | 35.6 mm (2 × 17.8 mm module) |
| Protection level | IP20 |
| Certifications | CB, CE, SEMKO |
Standards & certifications
The KNB1-125 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 KNB1-125 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 KNB1-125 AC MCB is designed for overload and short-circuit protection in compatible AC distribution circuits, protecting wiring, appliances and connected equipment.
The KNB1-125 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 KNB1-125 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.
