AT Series – Split Core Current Transformers for Smart Grid & Automation
The AT Series split‑core current transformers are designed for the electronic measurement of AC current waveforms, providing galvanic isolation between the primary and secondary circuits. Based on air‑core current transformer technology, AT current sensors are well suited for applications requiring reliable and flexible current monitoring in energy, smart grid, and automation systems.
A key characteristic of the AT Series is its versatility in output configurations. AT current transformers are available with current or voltage outputs, including 4–20 mA, 0–5 V, and 0–10 V, enabling easy integration into a wide range of control and monitoring architectures. They provide an RMS (average‑responding) output, feature a terminal connection, and incorporate a 16 mm aperture, supporting straightforward installation in industrial environments.
AT – Features & Benefits
Main characteristics
- RMS output
- Split‑core current transformer, enabling non‑contact installation
- Multiple output formats including loop‑powered 4–20 mA and 0–5 V / 0–10 V voltage outputs
- 16 mm sensing aperture, suitable for common industrial conductors
- Terminal output
- Insulating plastic case recognized according to UL 94‑V0
Benefits
- High insulation between primary and secondary circuits
- Compact housing, optimized for space‑constrained panels
- Cost‑effective solution for AC current monitoring
- Easy installation
Typical applications
The AT Series is primarily intended for energy and automation systems, including:
- Automation & supervision: Current measurement for process regulation using PLCs or remote control systems (e.g. SCADA)
- Safety & condition monitoring: Load monitoring for protection systems and predictive maintenance (e.g. conveyors, pumps, HVAC motors)
- Energy management: Convenient connection to power consumption sub-meters
The AT Series is well adapted to applications where fixed wiring, panel integration, and centralized control are required.
LEM AT – Download & Technical Characteristic
| Product | Check Stock | Document | Nominal value | Output | Secondary nominal signal value | Op. Temp |
|---|---|---|---|---|---|---|
| AT 5 B420L | Datasheet 3D | 5 A | Current | 4-20mA | -20 to 60°C | |
| AT 5 B5 | Datasheet 3D | 5 A | Voltage | 0-5V | -20 to 60°C | |
| AT 5 B10 | Datasheet 3D | 5 A | Voltage | 0-10V | -20 to 60°C | |
| AT 10 B420L | Datasheet 3D | 10 A | Current | 4-20mA | -20 to 60°C | |
| AT 10 B5 | Datasheet 3D | 10 A | Voltage | 0-5V | -20 to 60°C | |
| AT 10 B10 | Datasheet 3D | 10 A | Voltage | 0-10V | -20 to 60°C | |
| AT 20 B420L | Datasheet 3D | 20 A | Current | 4-20mA | -20 to 60°C | |
| AT 20 B5 | Datasheet 3D | 20 A | Voltage | 0-5V | -20 to 60°C | |
| AT 20 B10 | Datasheet 3D | 20 A | Voltage | 0-10V | -20 to 60°C | |
| AT 50 B420L | Datasheet 3D | 50 A | Current | 4-20mA | -20 to 60°C | |
| AT 50 B5 | Datasheet 3D | 50 A | Voltage | 0-5V | -20 to 60°C | |
| AT 50 B10 | Datasheet 3D | 50 A | Voltage | 0-10V | -20 to 60°C | |
| AT 100 B420L | Datasheet 3D | 100 A | Current | 4-20mA | -20 to 60°C | |
| AT 100 B5 | Datasheet 3D | 100 A | Voltage | 0-5V | -20 to 60°C | |
| AT 100 B10 | Datasheet 3D | 100 A | Voltage | 0-10V | -20 to 60°C | |
| AT 150 B420L | Datasheet 3D | 150 A | Current | 4-20mA | -20 to 60°C | |
| AT 150 B10 | Datasheet 3D | 150 A | Voltage | 0-10V | -20 to 60°C |
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