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Views： 9 Author： Mark Zhang Publish Time： 2026-07-24 Origin： 本站
The DZ47 miniature circuit breaker (4.5kA) from SINGI is designed for overamperage and short-circuit protection in residential and commercial low-volt-level distribution systems. This article explains its core functions, choice criteria, and technical features to help engineers and procurement professionals make informed decisions. For the full product range, visit the DZ47 Miniature Circuit Breaker page.
Article Outline
A miniature circuit breaker is the first line of defense against electrical faults. The DZ47 (4.5kA) is rated to interrupt fault currents up to 4.5 kiloamperes under short-circuit conditions, in compliance with IEC 60947-2 and GB/T 14048.2-2020. Its primary roles are:
The 4.5kA breaking capacity suits most residential and light commercial installations where the prospective short-circuit amperage is below this threshold. Choosing a breaker with insufficient capacity risks weld contacts and fire.
Engineers and procurement managers face these concerns:
Note: Always verify the actual prospective short-circuit amperage at the installation point. A 4.5kA MCB is not suitable for industrial environments with high fault currents above 6kA.
The DZ47 uses a thermal-magnetic trip mechanism. The bimetallic strip responds to prolonged overloads, while the solenoid coil triggers instantaneous tripping on high currents. Arc extinguishing is aided by a grid of deion plates that split and cool the arc, a design supported by research on nanocrystalline arc-extinguishing grids (Wang & Liu, 2023). This ensures amperage limiting and reduced let-through energy.
, the DZ47 enclosure is made of flame-retardant PA66 material, resisting impact and heat. The contacts are silver alloy to minimize resistance and welding risk.
Key specifications of the DZ47 (4.5kA) include:
| Feature | DZ47 (4.5kA) | Generic 6kA MCB |
|---|---|---|
| Breaking capacity | 4.5kA | 6kA |
| Typical application | Residential, light commercial | Industrial, high-fault |
| Price per pole | Lower | Higher |
| Standard compliance | IEC, GB, CCC | IEC, UL |
For projects where fault amperage is below 4.5kA, the DZ47 offers a cost-effective solution without over-specifying.
Proper installation is critical. The DZ47 mounts on 35mm DIN rail with a clip-on mechanism. Ensure conductors are torqued to the specified value (2.0 N·m for 25mm²) to avoid overheating. Periodic testing of the trip mechanism (manual push-to-trip button) is recommended every six months to verify mechanical function.
Important: Always de-energize the circuit before installation or maintenance. Follow local electrical codes and manufacturer guidelines.
A: No. The breaker may fail to interrupt a fault above its rating, leading to catastrophic damage. Use a higher breaking capacity device (e.g., 6kA or 10kA) in such locations.
A: B curve trips at 3-5 times rated amperage (for resistive loads), C curve at 5-10 times (general purpose), and D curve at 10-20 times (motor starting). Choose based on load type.
A: The DZ47 is designed to IEC and GB standards. For UL 489 compliance, contact SINGI for UL-listed variants.
A: Check the laser-printed rating on the side, the SINGI logo, and the QR code for batch traceability.
Choose the DZ47 Miniature Circuit Breaker for reliable overamperage protection in your next project. View product details and request a quote from SINGI.
