Electrical cabinets are used in power distribution, automation control, data centers, telecom systems, battery systems and industrial equipment. Inside these cabinets, electrical components operate continuously under load. A small fault such as loose wiring, overloaded cable, poor contact, insulation aging or abnormal heating can develop into a serious fire risk.
For this reason, a cabinet-level fire safety system should not only detect smoke after a fire has already developed. A better solution is to detect the early signs of fire inside the cabinet and then link the alarm signal to a suppression system.
A complete cabinet-level fire detection and suppression system should include four parts:
early detection, alarm confirmation, system linkage and local fire suppression.
The first step is to monitor the cabinet microenvironment.
A normal ceiling smoke detector is designed for room-level fire alarm. It may detect smoke after smoke spreads out of the cabinet and reaches the room ceiling. However, electrical cabinet fire risk often starts inside the cabinet first.
ANWETECH AT-AS03 is designed for this type of application. It is an Electrical Micro-environment Thermal Overload Detector that actively analyzes air samples for particulate concentration, characteristic gas concentration and temperature. The product is suitable for communication equipment cabinets, power system equipment, internet data center cabinets, power distribution cabinets, compact substations and other confined electrical spaces
This makes AT-AS03 suitable as the first detection layer in a cabinet-level fire protection system.
For electrical cabinets, early fire risk may appear before visible smoke. The first signs may include:
AT-AS03 uses laser cavity detection technology and gas sensitivity technology to detect fine particles and characteristic gases released in the early stage of material combustion. It samples mixed air into the detection core, analyzes particulate concentration and gas concentration, and issues an alarm when the air parameters reach the set threshold.
This is the key difference between a simple smoke detector and a cabinet-level early warning detector.
A cabinet fire detection system should not only have one alarm level. Electrical faults often develop step by step, so the alarm logic should also be step by step.
AT-AS03 supports multiple alarm levels, including:
A cabinet-level fire detection system should be able to communicate with other systems.
AT-AS03 provides RS485 communication and alarm/fault output. It can actively sample air, perform analysis and alarm, and communicate between detectors and monitoring computers. The monitoring computer can collect and summarize information from multiple detectors for remote monitoring and control.
The system can be connected to:
For engineering projects, RS485 can be used for monitoring and data communication, while relay output can be used for alarm linkage.
After early detection and alarm confirmation, the next step is suppression linkage.
For cabinet-level applications, the suppression system can be designed according to the cabinet type, volume, risk level and customer requirement.
Possible suppression options include:
The basic linkage logic can be:
AT-AS03 detects abnormal particles / gases / temperature
→ Alarm signal sent by RS485 or relay output
→ Fire alarm panel or extinguishing control panel receives signal
→ Warning / pre-alarm / fire alarm is displayed
→ Sounder beacon activates
→ Optional power shutdown signal is triggered
→ Suppression system releases extinguishing agent after confirmed logic
For safety, the detector should normally not directly release extinguishing agent by itself. The better engineering design is to connect the detector signal to a fire alarm control panel or extinguishing control panel, then release the agent according to confirmed alarm logic and project requirements.
This cabinet-level fire detection and suppression solution is suitable for:
The best cabinet fire protection strategy is not only to extinguish the fire. It is to detect the risk early, warn the operator in time, and activate suppression before the fire causes serious damage.
