When customers choose a cabinet-level early fire warning detector, they often ask three practical questions:
Can the detector work alone?
Can it connect to a fire alarm panel?
Does it have dry contact or relay output?
These questions are important because cabinet fire detection is not only about detecting early fire risk. In real projects, the detector also needs to send signals to a monitoring system, a fire alarm control panel, a local alarm device or a suppression control system.
ANWETECH AT-AS03 is designed as an Electrical Micro-environment Thermal Overload Detector. According to the user manual, it actively analyzes air samples for particulate concentration, characteristic gas concentration and temperature, then provides alarms based on set thresholds. It is suitable for communication equipment cabinets, power system equipment, internet data center cabinets, power distribution cabinets, compact substations and other confined electrical spaces.
For engineering applications, two interfaces are especially important: RS485 communication and relay / alarm output.
Yes. AT-AS03 can work as an independent cabinet-level early warning detector.
It has its own power input, detection chamber, suction device, local indicators and function key. The manual shows that the detector has Power, Fault and Alarm indicators. The Alarm indicator lights when the fire parameters in the monitored area meet the alarm condition, and the function key can be used for mute, reset and parameter learning operation.
This means AT-AS03 can perform basic local detection and alarm indication by itself.
However, it is important to explain this clearly:
Standalone operation does not mean it replaces a complete fire alarm system.
AT-AS03 can independently monitor a cabinet microenvironment, but if the project requires remote monitoring, fire alarm panel display, local sounder linkage, shutdown logic or suppression system control, it should be connected to an external system through RS485 or relay output.
A simple explanation for customers is:
AT-AS03 can work alone for local cabinet early warning, but its full engineering value appears when it is connected to a monitoring system or fire alarm system.
RS485 is mainly used for data communication and centralized monitoring.
In many real projects, the customer does not monitor only one cabinet. A site may have many telecom cabinets, power distribution cabinets, control cabinets, data center racks, UPS cabinets or BESS battery cabinets. If each cabinet has one detector, the customer needs to know:
This is where RS485 becomes useful.
The AT-AS03 manual states that the system can include the detector and background monitoring software. The detector can actively sample air, perform analysis and alarm, and enable communication between detectors and monitoring computers. The monitoring computer can collect and summarize information from multiple sampling hosts and support remote monitoring and control.
In simple terms:
RS485 is used when the customer wants the control room or monitoring platform to know which cabinet has an alarm or fault.
For example:
AT-AS03 → RS485 → Monitoring Computer / BMS / EMS / SCADA
This is especially useful for projects with multiple cabinets or unmanned equipment rooms.
Yes, AT-AS03 can be connected to a fire alarm panel through its alarm/fault output or relay output, depending on the project wiring design.
The manual identifies:
For a fire alarm system, AT-AS03 should normally be used as an input signal device, not as the fire alarm control panel itself.
A practical project logic can be:
AT-AS03 detects early abnormal particles / gas / temperature
→ Relay or ALM output sends signal
→ Fire alarm control panel receives the input
→ Panel displays alarm or fault
→ Sounder beacon, control room alarm or other linkage is activated
This makes AT-AS03 useful for cabinet-level early warning while allowing the fire alarm panel to handle system-level alarm management.
Customers often ask: “Does it have dry contact?”
The most accurate answer is:
AT-AS03 provides relay output for alarm linkage. This relay output can be used as a contact signal for external systems, depending on the project wiring design.
The manual states that AT-AS03 has 1 pair of relay output and the relay load capacity is ALM1 AC 60V 1A / DC 60V 1A.
For website and customer communication, the safest professional wording is:
AT-AS03 provides relay output for alarm/fault linkage. It can be connected to external devices such as a fire alarm panel input, local alarm device, monitoring system input or suppression control system according to the project wiring design.
Avoid saying “universal NO/NC/COM dry contact” unless the exact terminal definition has been confirmed in the project wiring diagram.
Many customers confuse RS485 and relay output. They are not the same.
| Function | RS485 Communication | Relay Output |
|---|---|---|
| Main purpose | Data communication | Alarm/fault signal linkage |
| Best for | Monitoring computer, BMS, EMS, SCADA | Fire alarm panel, local alarm, relay module |
| Information type | Device/status data | Simple alarm or fault signal |
| Suitable for | Multiple cabinets centralized monitoring | Triggering external alarm or control input |
| Typical customer value | Know which cabinet alarms | Send alarm signal to another system |
The easiest way to explain it is:
RS485 is for monitoring. Relay output is for alarm linkage.
Or in customer language:
RS485 tells the system what is happening. Relay output tells another device to take action.
For a small telecom cabinet or electrical cabinet, AT-AS03 can be used as a local early warning detector.
Typical logic:
AT-AS03 detects abnormal particles / gases / temperature
→ Local Alarm indicator activates
→ Operator checks the cabinet
This is suitable for small projects where local inspection is enough.
However, for critical cabinets, remote monitoring or alarm linkage is strongly recommended.
For projects that already have a fire alarm system, AT-AS03 can provide an alarm/fault signal to the fire alarm panel.
Typical logic:
AT-AS03 Relay / ALM Output
→ Fire Alarm Panel Input Module or Zone Input
→ Fire Alarm Panel Display
→ Sounder Beacon / Control Room Alarm
This is useful for:
The benefit is that cabinet-level early warning can be included in the building or facility fire alarm system.
For projects with many cabinets, RS485 communication can help centralize information.
Typical logic:
Multiple AT-AS03 Detectors
→ RS485 Communication Line
→ Monitoring Computer / BMS / EMS / SCADA
→ Remote Alarm and Status Display
This helps operators identify which specific cabinet requires attention.
For example, in a telecom site, if there are 20 communication cabinets, the customer does not only need an alarm sound. They need to know which cabinet is abnormal. RS485 communication makes this kind of centralized monitoring possible.
AT-AS03 can also be used as an early detection layer in a wider cabinet fire protection system.
Typical logic:
AT-AS03 detects early fire indicators
→ Relay output sends alarm signal
→ Fire alarm panel or suppression control panel receives the signal
→ System activates local alarm
→ Project-defined shutdown, ventilation or suppression response can be triggered
This type of design is suitable for high-value or high-risk cabinets, such as:
Engineering note: AT-AS03 should provide early detection and signal output. Final suppression release logic should be handled by the approved fire alarm or suppression control panel according to project requirements.
Cabinet fire risks often begin inside the cabinet before visible smoke spreads into the room. AT-AS03 is designed to monitor these small electrical microenvironments. It can detect small particles, characteristic gases and temperature in the early stages of combustion, and it uses multi-parameter analysis to improve early warning accuracy.
But early detection is only one part of the solution.
In real engineering projects, the alarm signal must go somewhere:
This is why RS485 and relay output matter.
They turn AT-AS03 from a single detector into part of a complete cabinet fire detection and alarm solution.
