Overview
ASD300 is a high-performance device for 3-35kV switchgear. It combines mimic diagram, HV live display, intelligent climate control (two heating, one fan), precision power measurement (class 0.5), optional wireless temperature (up to 12 points), voice prompts, human body induction, trip/close supervision, and RS485 Modbus. Ideal for applications requiring both electrical measurement and environmental monitoring.
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Precision Power Measurement
- 3P3L/3P4L selectable wiring
- Voltage, current, power, energy
- Class 0.5 accuracy
- True RMS measurement
- Primary side values displayed
Comprehensive Status & Safety
- Dynamic LED mimic diagram
- HV live display & phase check
- Voice error-prevention prompts
- Human body induction (auto backlight)
- Trip/close circuit supervision & voltage measurement
Flexible Temperature Monitoring
- Wireless temperature option (P3/P6/P9/P12)
- Range -50～+125℃, ±1℃ accuracy
- Sensor battery life ≥5 years
- Over-temperature alarm
- Wireless frequency 470MHz
Intelligent Environment Control
- 2 temp/humidity sensors (optional)
- 2 heating + 1 fan outputs
- Forced heating mode
- Heating circuit fault alarm
- Adjustable thresholds
Function
| Function | Description |
| Mimic Diagram | Dynamic LED display showing breaker, disconnector (trolley), earthing switch, and spring status. |
| HV Live Display | Phase-by-phase LED indication for live voltage; supports external phase matching via test holes. |
| Electromagnetic Lock | One lock output, controlled by live voltage; unlocks when all phases dead. |
| Power Parameter Measurement | Measures voltage, current, active/reactive power, power factor, energy. Accuracy class 0.5. 3P3L/3P4L selectable. |
| Wireless Temperature Monitoring (optional) | Supports up to 12 points (P3/P6/P9/P12). Measures temperature from -50℃ to +125℃ with ±1℃ accuracy. Over-temperature alarm. |
| Temperature/Humidity Control | Up to two external sensors (optional); controls two heating outputs and one fan output based on user-set thresholds. |
| Heating Circuit Alarm | Detects open circuit or overload of heating loads and reports alarm. |
| Voice Error–Prevention | Voice prompts when unsafe operation is attempted (e.g., moving trolley with breaker closed). Two selectable modes. |
| Human Body Induction | Automatically turns on backlight and cabinet lighting when operator approaches. |
| Trip/Close Supervision | Monitors continuity of trip and close circuits; indicates circuit health via LEDs. |
| Trip/Close Voltage Meas. | Measures control voltage on trip and close circuits (accuracy class 1). |
| Breaker Operation Counter | Records number of breaker operations; can be reset via menu. |
| RS485 Communication | Modbus-RTU protocol, baud rate 2400-19200, for remote monitoring and parameter setting. |
| Power–off Alarm | Relay output closes upon auxiliary power loss. |
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Specification
| Parameter | Value |
| Auxiliary Power | AC 85～265V or DC 100～300V |
| Power Consumption | ≤8 VA |
| Communication | RS485, Modbus-RTU, 2400-19200 bps |
| Power Measurement | Class 0.5 (voltage, current, power, energy) |
| Voltage Input | Rated 100V, consumption ≤0.5VA |
| Current Input | Rated 5A, consumption ≤1VA |
| Frequency | 50Hz |
| Wiring Modes | 3P3L or 3P4L selectable |
| Wireless Temperature (optional) | |
| – Number of Points | Up to 12 (P3/P6/P9/P12) |
| – Measuring Range | -50℃ ～ +125℃ |
| – Accuracy | ±1℃ |
| – Sensor Battery Life | ≥5 years |
| – Starting Current | ≥5A |
| Temperature Measurement | ±1℃ |
| Humidity Measurement | ±3% RH |
| Trip/Close Voltage Accuracy | Class 1 |
| Digital Inputs | 8 opto-isolated (passive contacts) |
| Relay Outputs | Heating I, Heating II, Fan, Alarm, Lock, Lighting (depending on model) |
| Operating Temperature | -10℃ ～ +55℃ |
| Relative Humidity | ≤95% (no condensation) |
| MTBF | ≥50,000 hours |
| Dimensions (W×H×D) | 238 mm × 178 mm × 83 mm |
| Panel Cut–out | 220 mm × 165 mm |
| Mounting | Panel flush mounting |
| Weight | Approx. 1.2 kg |
| Front Panel Protection | IP40 |
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FAQ
No, wireless temperature measurement is optional (P3, P6, P9, P12). Please specify when ordering.
It measures three-phase current, voltage, active/reactive power, power factor, frequency, and energy, all with class 0.5 accuracy.
You can set CT and PT ratios via the front panel menu (Parameter → Definite value) or via RS485 communication.
Optional. This function only works when the device is equipped with a switch that has pre-trip/pre-close contacts. Please confirm when ordering.
Sensors are powered by battery (ATE200) or CT-inductive (ATE400). Battery life ≥5 years at 25℃, CT-powered life ≥10 years.
ASD300 comes standard with power parameter measurement and optional wireless temperature; ASD320 comes standard with 3-point wireless temperature and no power measurement.
Summary
ASD300 integrates power metering, temperature monitoring, and safety features into one unit. Class 0.5 measurements eliminate separate meters, and optional wireless temperature prevents overheating. Voice prompts and trip/close supervision enhance safety. It simplifies panels and enables predictive maintenance.
