Home > Product > Electrical Protection Devices > Accessories > MCB auxiliary alarm contact


Built with a reliable changeover contact mechanism (typically 1NO + 1NC), the auxiliary alarm contact ensures stable and accurate signaling under various operating conditions. Its modular design allows for easy installation without additional wiring complexity, while maintaining compatibility with a wide range of MCB models. Commonly used in distribution panels, industrial control systems, and building automation setups, it enhances system safety and efficiency by enabling faster response to electrical faults.
| Use classes | Ue(V) | Ie(A) | Number of contacts |
| AC-12 | 230 | 2 | 2 groups of transfer contacts |
| AC-15 | 230 | 1 | |
| DC-12 | 110 | 0.5 |
The circuit breaker has the following accessories
Circuit breaker + auxiliary contact; circuit breaker + auxiliary alarm contact; circuit breaker +shunt trip;
circuit breaker + shunt trip + auxiliary contact; circuit breaker + shunt trip + auxiliary alarm contact; circuit breaker + undervoltage trip.
Installation and Use
1. This series of circuit breaker accessories are specially designed for use in conjnction with DAB7 (63 frame) circuit breakers and are not intended to be used alone.
2. The four accessories are installed on the left side of DAB7-63 miniature circuit breakers, the DAB7-OF, DAB7-FB, DAB7-QY are fixed with screws, the DAB7-FL is fixed to both sides with tape, and at the same time can be installed with the guide rail.
3. The mechanical connection between the circuit breaker and DAB7-, DAB7- FB, DAB7- FL, DAB7-QY transmission shaft should be flexible and compatible with the rest of the equipment.
4. After DAB7-QY circuit breaker has been installed, it can only be closed when press the test button. And installer should shut off the circuit breaker and release the test button immediately, thus ensure the installation safely and correctly. Besides, the rated voltage should pass through the undervoltage trip at same time.

Circuit breakers are essential for protecting power systems from overloads and short circuits. Modern advancements, such as multi-chip current sharing and IoT integration, enhance their efficiency, safety, and reliability. Smart circuit breakers enable real-time monitoring and predictive maintenance, reducing downtime. Future trends focus on intelligence and sustainability, leveraging AI and eco-friendly designs. By adopting these […]
Today, the industry faces new challenges and opportunities, driven by technological advancements, globalization, and changing consumer demands.
Building automation started with simple mechanical controls and has evolved into sophisticated digital systems that integrate various technologies to enhance building performance and occupant comfort.
Circuit breakers are critical in rail transportation, ensuring the safety and reliability of electrical systems in trains and infrastructure. Modern circuit breakers feature advanced technologies like fast fault detection and IoT integration, enabling real-time monitoring and predictive maintenance. These innovations minimize downtime and enhance operational efficiency. Additionally, compact and durable designs are tailored to withstand […]
Server rooms are critical facilities that house computer servers, networking equipment, and data storage systems. They play a pivotal role in ensuring the smooth operation of IT infrastructure for businesses.
Drilling platforms are essential structures in the oil and gas industry, enabling the extraction of hydrocarbons from beneath the Earth's surface. These platforms can be fixed or floating and are designed to withstand harsh marine environments.
The mining industry involves the extraction of valuable minerals or other geological materials from the Earth. The industry plays a crucial role in providing raw materials for various sectors, including construction, manufacturing, and energy production. However, the mining industry faces several challenges
The development of mining equipment has been driven by the need to extract resources from increasingly difficult-to-reach locations and to process larger quantities of ore with greater efficiency.

Do you need a professional team to provide you with solutions? Contact us for a quote
No.171 Yezhuang Road, Zhuanghang, Fengxian, Shanghai, China
Copyright © 2025 Shanghai DaDa Electric Co.,Ltd. All rights reserved.
Designed by IWONDER