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Views： 2 Author： Mark Zhang Publish Time： 2026-06-05 Origin： 本站
This guide provides a comprehensive overview of the DZ47 (4.5KA) Miniature Circuit Breaker, a widely used overcurrent protection device in low-voltage distribution systems. It explains choice criteria, key performance features, and application considerations for electrical engineers and procurement professionals. For more product details, visit the DZ47 MCB category page on Singi.
The article begins by explaining the fundamental role of the DZ47 MCB, then discusses choice criteria, technical design principles, and typical applications. A dedicated FAQ section addresses common buyer questions, followed by a conclusion that recommends the product.
The DZ47 miniature circuit breaker, rated for 4.5 kA short-circuit capacity, is engineered for overcurrent protection in residential, commercial, and light industrial installations. It complies with international standards such as IEC 60898-1 and GB/T 14048.2, ensuring reliable performance under fault conditions. The compact modular design allows easy installation in distribution boards, making it a preferred solution for engineers seeking cost-effective yet robust protection.
Choosing the correct miniature circuit breaker impacts both equipment safety and regulatory adherence. Key parameters include rated current, breaking capacity, and trip characteristics. For example, the DZ47 series offers B, C, and D curves to match different load types—lighting, motors, or transformers. Using an undersized breaker can lead to nuisance tripping or failure to clear faults, while an oversized one may not protect against low-level short circuits. According to IEC 60898-1, the 4.5 kA breaking capacity of the DZ47 suits most low-voltage networks where prospective short-circuit currents do not exceed this value. Engineers must verify system short-circuit levels before choice to ensure coordination and selective isolation.
The DZ47 incorporates a current-limiting mechanism that reduces thermal and dynamic stress on downstream equipment during a fault. Its arc chamber uses deion plates to split and cool the arc, ensuring rapid extinction. The trip unit combines a bimetal strip for overload protection and an electromagnetic coil for short-circuit detection. This dual-technology design delivers precise response times while maintaining high mechanical endurance (over 20,000 operations). Finite element analysis and type testing per GB/T 14048.2 confirm its ability to interrupt faults within milliseconds, minimizing energy let-through.
Common applications include final distribution circuits in apartment buildings, lighting control panels, air conditioning systems, and small motor protection. The MCB's narrow width (18 mm per pole) saves panel space, and its standardized rail mounting simplifies installation. For OEM panel builders, the Singi DZ47 offers consistent quality and global certifications, reducing compliance risks. Additionally, its adaptability for use in DC circuits (with appropriate rating) broadens its utility in solar combiner boxes and battery systems. Procurement agents appreciate the long service life and low failure rate, which lower total cost of ownership.
| Parameter | DZ47 (4.5KA) |
|---|---|
| Rated Current (In) | 1A – 63A |
| Breaking Capacity (Icn) | 4.5 kA (IEC 60898-1) |
| Trip Curves | B, C, D |
| Poles | 1P, 2P, 3P, 4P |
| Mechanical Life | >20,000 cycles |
| Standards | IEC 60898-1, GB/T 14048.2 |
The DZ47 is a standard 4.5 kA breaking capacity MCB for general purpose. DZ158 typically offers higher breaking capacities (e.g., 6 kA or 10 kA) and larger size, while DZ267 is a thinner version for space-saving. The DZ47 strikes a balance between cost and performance for typical low-voltage circuits.
Yes, but only if rated for DC voltage (typically 48 V, 60 V, or 125 V per pole). The DZ47 DC version uses extended arc chambers and magnets to handle direct current interruption. Check the specific product label for DC ratings.
Use B-curve for resistive loads like lighting (3-5x In), C-curve for general inductive loads like small motors (5-10x In), and D-curve for high inrush loads like transformers or welding equipment (10-20x In).
4.5 kA is adequate for most residential and commercial low-voltage networks where the maximum prospective short-circuit current does not exceed 4.5 kA. For industrial settings with higher fault levels, a breaker with higher breaking capacity (e.g., 6 kA or 10 kA) should be chosen. Always perform a short-circuit calculation.
Singi's DZ47 series is certified to IEC 60898-1, GB/T 14048.2, and other national standards. It carries CE and CCC marks, ensuring quality and safety for global markets.
The DZ47 (4.5KA) Miniature Circuit Breaker from Singi provides reliable overcurrent protection, compliance with international norms, and versatile application in low-voltage distribution. Whether you are an engineer designing a new panel or a procurement agent sourcing quality components, the DZ47 offers proven performance and excellent value. For detailed specifications, drawings, and ordering information, visit the Singi DZ47 product page.
[1] IEC 60898-1. Electrical accessories – Circuit-breakers for overcurrent protection for household and similar installations – Part 1: Circuit-breakers for a.c. operation.
[2] GB/T 14048.2-2020. Low-voltage switchgear and controlgear – Part 2: Circuit breakers.
[3] Singi Electric Co., Ltd. DZ47 Miniature Circuit Breaker Technical Datasheet, 2024.
