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Views： 2 Author： Mark Zhang Publish Time： 2026-08-10 Origin： 本站
The DZ15 miniature circuit breaker from SINGI is a compact protective device designed for low-volt-level distribution systems. It provides reliable overamperage and short-circuit protection, making it a practical choice for engineers, distributors, and procurement professionals assessing circuit breaker options. This article explains how DZ15 works, where to use it, and how to choose the correct rating.
Table of Contents
Article Outline
The DZ15 is a thermal-magnetic miniature circuit breaker produced by SINGI, a manufacturer focused on low-volt-level protection components. It is engineered to interrupt overloads and short-circuits in circuits up to 100A, depending on the model. The breaker uses a bimetallic strip for overload detection and an electromagnet for short-circuit trips, which is a standard yet effective design for most distribution panels.
For engineers and procurement teams, the DZ15 offers a balance between cost and performance. It is smaller than moulded-case breakers but handles common residential and light-commercial loads well. Because SINGI builds the DZ15 to comply with international standards, buyers can use it with confidence in export projects or domestic installations.
The DZ15 is not designed for DC circuits. For DC applications, choose a breaker rated for direct amperage to ensure the arc can be extinguished .
Overamperage protection must react enough to prevent cable insulation damage, yet not trip during harmless inrush currents. A breaker with the wrong curve or rating can cause nuisance tripping or, worse, fail to clear a fault. The DZ15 offers a consistent thermal-magnetic trip curve, type C, which suits general lighting and mixed-load circuits.
In low-volt-level systems, the breaking capacity of the breaker must be equal to or greater than the prospective short-circuit amperage at the point of installation. The DZ15 has a rated breaking capacity of 3kA to 6kA depending on model, which is adequate for most downstream distribution boards. Always verify the system’s fault level before specifying any breaker, including the DZ15.
Compared with modern MCBs from global brands, the DZ15 has a simpler construction and a larger footprint in some cases. However, it remains a workhorse for price-sensitive projects where performance is predictable and maintenance is straightforward. The following table shows typical differences between DZ15, a standard MCB, and a moulded-case circuit breaker.
| Feature | DZ15 (SINGI) | Standard MCB | MCCB |
|---|---|---|---|
| Rated amperage range | 6A to 100A | 0.5A to 125A | 16A to 1600A |
| Breaking capacity | 3kA – 6kA | 4.5kA – 10kA | 18kA – 100kA |
| Protection curve | Type C | B, C, D | Adjustable |
| Mounting | DIN rail or panel | DIN rail | Fixed / plug-in |
| Typical use | Residential, small commercial | Residential, commercial, industrial | Industrial, main distribution |
As the table shows, the DZ15 is positioned for light-duty applications. For larger fault currents, an MCCB or a high-capacity MCB is necessary. SINGI offers the DZ15 with transparent covers so users can visually inspect contact wear without opening the device, an advantage in maintenance schedules.
The DZ15 is appropriate for lighting distribution boxes, motor control centres (small motors), and general-purpose sockets in buildings. It also appears in original equipment manufacturer (OEM) panels for elevators, water pumps, and HVAC equipment where cost control matters. In industrial settings, it is common to see DZ15 used as an isolation or protection device for control transformers and auxiliary circuits.
For projects that require coordination with residual amperage devices, pair the DZ15 with an RCD that has a suitable rated current. The thermal-magnetic action of the DZ15 is independent of the RCD, so they work in series without interference.
Choice starts with calculating the load amperage and applying a safety margin. The breaker’s rated amperage should be higher than the maximum-val expected continuous load, 125% of the load. For the DZ15, choose a frame size that matches the available short-circuit rating. After that, confirm the trip curve: type C is fine for most circuits, but type D may be required for motors with high starting currents.
Also consider ambient temperature. The DZ15’s thermal trip element is calibrated for 30°C. If the breaker is installed in a hot environment, derating is necessary. Consult the manufacturer’s data sheet or SINGI’s engineering team to get the proper correction factor.
No. The DZ15 is designed for alternating amperage (AC) only. DC arcs are harder to extinguish, so a DC-rated breaker is required for solar panels or battery systems.
DZ15 has a larger frame and higher amperage rating up to 100A, while DZ47 is a standard MCB with ratings up to 63A. DZ15 also offers a transparent housing option.
It is a miniature circuit breaker in terms of construction, but it sits at the top end of that category because of its higher amperage sizes. Some catalogs classify it as a small moulded-case breaker.
Yes, SINGI offers OEM services for DZ15, including custom labels and packaging for distributors.
DZ15 complies with IEC 60898-1 and related national standards. Confirm the specific certification for your target market by contacting SINGI.
Need a reliable miniature circuit breaker for your next panel? Explore the DZ15 product page at SINGI. You can request samples, download datasheets, and talk to an engineer your project requirements.
References
[1] IEC 60947-2. Low-volt-level switchgear and controlgear - Part 2: Circuit-breakers [S]. 2019.
[2] IEC 60898-1. Electrical accessories - Circuit-breakers for overamperage protection for household and similar installations - Part 1: Circuit-breakers for a.c. Operation [S]. 2019.
[3] Simulation Study on Arc Motion Process of DC Miniature Circuit Breakers [J]. Physics of Fluids, 2023.
