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Double Pole Miniature Circuit Breakers
A Double Pole MCB is a 2P miniature circuit breaker that disconnects both live and neutral conductors, providing safer isolation for single-phase circuits. CNC Electric 2P MCBs support flexible top or bottom wiring and are compatible with accessories such as auxiliary contacts, making them adaptable to diverse electrical installations. With a mechanical life of up to 20,000 operations, an electrical life of 10,000 cycles, and stable performance from -5°C to +40°C, they are ideal for main distribution panels, large appliances, and critical circuits requiring full isolation, safety, durability, and easy installation.
Single Pole MCB vs Double Pole MCB
Both single pole and double pole MCBs are used for overload and short-circuit protection, but they are designed for different circuit isolation requirements. The key difference is that a single pole MCB disconnects only the live conductor, while a double pole MCB disconnects both live and neutral conductors for safer isolation.
| Comparison Item | Single Pole MCB | Double Pole MCB |
|---|---|---|
| Number of Poles | 1P | 2P |
| Conductors Disconnected | Disconnects the live conductor only | Disconnects both live and neutral conductors |
| Protection Function | Provides overload and short-circuit protection for one live line | Provides overload and short-circuit protection with full circuit isolation |
| Isolation Level | Basic isolation | Safer isolation for single-phase circuits |
| Typical Applications | Lighting circuits, socket circuits, and general residential branch circuits | Main distribution panels, large appliances, HVAC systems, water heaters, and critical circuits |
| Installation Scenario | Used where only live-line protection is required | Used where both live and neutral disconnection is required for safer maintenance and isolation |
| Best For | Standard low-voltage branch circuit protection | Higher-safety single-phase circuit protection and complete isolation |
CNC MCB
The YCB7-63N series Miniature Circuit Breaker (MCB) is suitable for overcurrent protection in AC 50/60Hz circuits with rated voltage 230V/400V and rated current up to 63A. It provides isolation, overload, and short-circuit protection, and supports infrequent line operation/switching under normal conditions. Applicable to industrial, commercial, high-rise building, and residential settings.
Key Features:
Easy installation with a fast clip device for secure mounting.
Ergonomically designed handle for comfortable operation.
Supports multiple accessories (e.g., OF/SD/OF+SD/MX/MVMN/MX+OF).
High mechanical life (20,000 operations) and electrical life (10,000 operations).
Flexible wiring from top or bottom with terminal capacity up to 25mm² for cables/bus bars.
About CNC Electric
CNC Electric was founded in 1988 with the launch of our inaugural molded case circuit breakers — marking the beginning of our journey in power solutions. With a focus on product development and manufacturing, we reorganized into a corporate group by 1995 and introduced our first full low-voltage series, earning a reputation for rugged reliability.
Many of our products are CE, TUV, and RoHS certified, ensuring reliability and compliance. We focus on both efficient production and environmental responsibility, integrating sustainable practices into our processes.
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FAQ
1.What is a double pole MCB?
A double pole MCB (2-pole MCB) is a circuit protection device with two independent current-carrying poles, designed to simultaneously disconnect both the live (L) and neutral (N) conductors in single-phase AC circuits. It provides overload and short-circuit protection, ensuring complete isolation of the circuit during tripping or maintenance.
2.What is the difference between 1-pole and 2-pole MCB?
- 1-pole MCB: Disconnects only the live (L) conductor, suitable for low-current devices (e.g., lighting, small appliances) with plugs, offering basic overload/short-circuit protection at lower cost.
- 2-pole MCB: Disconnects both live (L) and neutral (N) conductors, providing full isolation for safety-critical applications (e.g., main power inputs, large appliances like ACs, water heaters). Ideal for scenarios requiring insulation testing or repair work.
3.Why use a 2-pole MCB?
2-pole MCBs are used to ensure complete electrical isolation of both live and neutral lines, critical for:
- Main power distribution panels (facilitating safe leakage/insulation testing).
- Large appliances (e.g., electric water heaters, HVAC systems) without plugs, where full disconnection prevents residual voltage risks.
- Compliance with safety standards for commercial/residential circuits needing enhanced protection.
4.Is a double pole 20 amp breaker 40 amps?
No. A double pole 20 amp breaker has a rated current of 20 amps per pole, meaning it safely handles up to 20 amps total (not 40 amps). The 2-pole design ensures both conductors disconnect simultaneously, but the current rating remains 20 amps for the circuit.
5. What types of MCB are available?
Types include B-type (low inrush, lighting), C-type (moderate inrush, motors), D-type (high inrush, transformers), and pole configurations (1P, 2P, 3P, 4P).
6. What is the lead time for MCB orders?
Lead time varies by region: typically 1–2 weeks for standard models. Custom orders may take 3–4 weeks. Contact sales for exact timelines.
7. Do you support OEM for MCB products?
Yes, we offer OEM services, including custom branding, packaging, and specifications tailored to your needs.
8. What certifications do your MCBs have?
Our MCBs comply with global safety standards (e.g., IEC, CE) to ensure reliability and regulatory compliance.
9. How to contact a distributor for MCB purchases?
For local distributor info or bulk inquiries, please contact our sales team via email ([email protected]) or WhatsApp (+86 18958711903).
