Overview
The ATE400 is a completely passive, battery‑free wireless temperature sensor. It is designed for thermal monitoring of critical electrical connections inside MV and LV switchgear – for example, busbar joints, cable terminations and breaker contacts.
How does it power itself?
It uses CT energy harvesting. An alloy strap is wrapped around the conductor. As soon as the primary current reaches about 5 amps, the sensor wakes up and starts measuring. No batteries, no maintenance – the design life is over ten years.
Highlight
Maintenance-free
- CT powered, no battery
- Starts at ≥5A current
- Max current 5000A
- Truly maintenance-free
Easy installation
- Alloy chip fixing
- Fits confined spaces
- Adapts to various shapes
- Quick and secure
Multi-band wireless
- 470/433/868-923MHz
- Range: 150m (470/868-923)
- Range: 50m (433MHz)
- Flexible networking
Fast & accurate
- 15s sampling & transmission
- ±1℃ accuracy
- Real-time monitoring
- Quick fault warning
Pain Points
Is Your Substation Facing These Fatal Hidden Dangers?
Traditional temperature monitoring methods are ruining your operational efficiency:
Risky & Costly Battery Replacements
- Traditional sensors run out of juice quickly. Power outages for battery swaps cost fortunes and involve high-voltage operational risks.
Delayed Manual Infrared Inspections
- Manual walk-throughs cannot provide 24/7 protection. Disasters often strike between inspection intervals.
Frequent False Alarms
- Low-end sensors lack anti-interference capabilities, triggering endless false alarms in strong electromagnetic fields.
Acrel Solution
Acrel ATE400: The Ultimate Battery-Free Wireless Solution for Heavy Industries & Smart Grids
Matches the Lifespan of Your Equipment
- Starts operating at currents as low as 5A. As long as the busbar is energized, the sensor never dies.
Alloy Strap, 5-Minute Rapid Installation
- Patented secure design. No damaging the busbars, no compromising insulation, tightly secured and high-temperature resistant.
Industrial-Grade Anti-Interference
- Passed rigorous flame-retardant and Electromagnetic Compatibility (EMC) tests. Performs flawlessly under strong magnetic fields, high humidity, and heavy dust.
Focus Areas
Medium-Voltage Switchgear (e.g., 10kV / 35kV)
- Location: Circuit breaker tulip contacts, fixed contacts, MV cable termination joints, and busbar connections.
- Pain Point: MV environments demand extreme insulation and present intense electromagnetic fields. Traditional active sensors with built-in batteries leak or fail rapidly under strong fields, and can even trigger catastrophic phase-to-phase short circuits due to insufficient insulation clearance.
- ATE400 Value: Utilizing RF technology and a battery-free design, it achieves absolute high-to-low voltage physical isolation. Eliminating battery-related hazards and resisting high-voltage creeping, it perfectly complies with the stringent insulation safety standards of MV switchgears.
Low-Voltage Switchgear (e.g., GGD / GCS / MNS)
- Location: Outgoing/incoming plug-in contacts of drawer units, capacitor bank wiring terminals, and main LV busbar joints.
- Pain Point: LV cabinets are packed with high-density circuits, offering extremely cramped spaces and complex wiring. Frequent operation of drawer units leads to poor contact wear. This causes hidden localized overheating during heavy loads, which is impossible to detect via standard manual inspections.
- ATE400 Value: Features an ultra-compact footprint tailored specifically for tight spaces. The patented alloy strap enables quick tool-free mounting without altering the existing layout, providing 24/7 invisible protection for every thermal-vulnerable contact.
Function
| Temperature Measurement | via alloy base, range -50°C ~ +125°C, accuracy ±1°C |
| CT Powered | harvests energy from primary current, starting current ≥5A, max 5000A |
| Wireless Communication | 470MHz/433MHz/868-923MHz, open area range: 150m (470/868-923), 50m (433) |
| Transmission Frequency | fixed at 15s for both sampling and transmission |
| Installation | alloy chip fixing, adapts to various conductor shapes |
| Pairing | factory pre-paired with display units (ASD/ARTM-Pn, ATC600-C); group number and code label guide installation |
Specification
| Parameter | Value |
| Wireless Frequency | 470MHz, 433MHz, 868-923MHz |
| Communication Distance | 150m (470MHz/868-923MHz), 50m (433MHz) in open area |
| Sampling Frequency | 15s |
| Transmission Frequency | 15s |
| Power Supply | CT powered, starting current ≥5A, max operating current ≤5000A |
| Temperature Range | -50°C ~ +125°C |
| Accuracy | ±1°C |
| Installation | Alloy chip fixing |
| Application | Electrical joints in HV/LV switchgears |
| Probe Type | Integrated alloy base |
| Dimensions | See outline drawing |
Show More
Optional Accessories
Extra Alloy Chips – For installations with circumference >270mm, order additional alloy chips (2 pcs per sensor).
Metal Hasp & Silicone Gaskets – Spare parts for fixing.
FAQ
No. It is powered by CT harvesting from the primary current. As long as the current is ≥5A, it operates continuously without any battery.
Wrap two alloy chips around the conductor, pass them through the sensor body and silicone gaskets, then tighten the metal hasp. Trim excess alloy chips. See installation drawings for details.
In open areas, up to 150m for 470MHz/868-923MHz versions, and up to 50m for 433MHz version. Actual range may vary depending on switchgear shielding.
The sensor is factory-paired with Acrel display units (ASD/ARTM-Pn, ATC600-C). Using it with other receivers may require custom frequency matching; please consult our technical support.
The sensor starts operating when the primary current reaches ≥5A. Below this value, it may not power up.
The accuracy is ±1°C over the entire range (-50°C ~ +125°C).
No. The sensor is electrically isolated from the primary conductor. The alloy chips and housing provide no conductive path, maintaining original insulation levels.
Yes. Each sensor has a unique code and group number. They can be paired with a single receiver (e.g., ATC600-C) to monitor multiple points simultaneously.
Summary
The ATE400 passive wireless temperature sensor offers a true maintenance-free solution for critical electrical joints in switchgear.
Its CT power-harvesting technology eliminates battery replacement, while the compact alloy-chip fixing fits almost any confined space.
With multiple frequency options and fast 15-second updates, it provides reliable, real-temperature data for preventive maintenance and fault early warning.
Factory pre-pairing with Acrel display units simplifies installation – simply match the labels.
