ALP220-EF Earth Fault Relay

ALP220-EF Earth Fault Relay is designed for low-voltage applications (up to 380 V) where it is necessary to monitor the system's ground current and provide protection when the ground current exceeds the permissible limit. This relay features an LCD display, Modbus-RTU communication capability, system current measurement, three-phase current overcurrent protection, ground current overcurrent protection, residual current measurement, residual current overcurrent protection, fault logging, and event logging functions.

Acrel ALP500 Low voltage protection measurement and control device

ALP500 low-voltage protection measurement and control device is suitable for low-voltage power distribution circuit with rated voltage to AC660V , integrating power monitoring, feeder protection, opening and closing control, communication networking, node temperature measurement, operation and maintenance management and other functions. It has various protection functions such as inverse time overcurrent, three-stage overcurrent, overpower, zero sequence overcurrent, undervoltage, overvoltage, unbalance (voltage, current), neutral line overcurrent, and leakage current. Different communication modules can be selected to meet the needs of on-site communication. The product adopts embedded installation and consists of a main body, a transformer and optional functional modules.

Acrel ATC600-PD Wireless Partial Discharge Transceiver

The ATC600-PD is a wireless partial discharge (PD) receiver designed for Acrel's online insulation monitoring system. It collects data from APD300-W and APD300-WP wireless PD sensors and transmits it to SCADA or monitoring platforms via RS485 Modbus-RTU, enabling real-time condition monitoring of 3–35kV medium-voltage switchgear, ring main units (RMUs), and distribution cabinets. Operating in the 470–510MHz wireless frequency band, the ATC600-PD provides stable and reliable communication with multiple wireless sensors while reducing installation costs by eliminating complex communication wiring. One receiver supports up to 40 wireless PD sensors and 240 wireless temperature sensors, making it suitable for integrated equipment health monitoring. It also features two relay alarm outputs for timely fault notification and preventive maintenance. With 35mm DIN rail installation, wide power supply options (AC/DC 100–265V or DC 12–48V), low power consumption, and industrial-grade reliability, the ATC600-PD is an ideal communication gateway for intelligent partial discharge monitoring systems, helping improve equipment reliability, reduce maintenance costs, and prevent unexpected power failures.

Acrel APD300-WP Wireless Partial Discharge Sensor

The APD300-WP is a wireless 3-in-1 partial discharge sensor designed for continuous online condition monitoring of medium-voltage switchgear. It detects partial discharge signals using Acoustic Emission (AE), Transient Earth Voltage (TEV), and Ultra High Frequency (UHF) technologies, enabling early identification of insulation defects and helping prevent insulation deterioration and unexpected equipment failures. It also measures ambient temperature, humidity, and noise to provide comprehensive operating data for equipment condition assessment. The APD300-WP is powered by DC 12–36V and transmits monitoring data via LoRa wireless communication to the ATC600-PD wireless receiver, which then forwards data to the monitoring system through RS485. The sensor adopts a strong magnetic mounting design for installation on the inner wall of the switchgear cable compartment, allowing fast and reliable deployment. With continuous online monitoring and real-time data transmission, the APD300-WP provides effective insulation status evaluation and early fault warning, improving the safety and reliability of power distribution systems. It is suitable for metal-enclosed switchgear, ring main units, and other medium-voltage electrical equipment in power utilities and industrial facilities.

Acrel APD300-W Wireless Partial Discharge Sensor

The APD300-W is a wireless 3-in-1 partial discharge (PD) sensor designed for online condition monitoring of medium-voltage switchgear. Integrating Acoustic Emission (AE), Transient Earth Voltage (TEV), and Ultra High Frequency (UHF) detection technologies, it provides comprehensive PD monitoring for early identification of insulation defects and potential equipment failures. Powered by a built-in replaceable lithium battery with a typical service life of 3–4 years, the sensor communicates wirelessly via LoRa, eliminating the need for communication wiring and enabling fast, non-intrusive installation using a magnetic mounting method. In addition to PD detection, the APD300-W monitors ambient temperature, humidity, and noise to support accurate equipment condition assessment. It is widely used in ring main units, metal-clad switchgear, and other MV distribution equipment across power utilities, industrial plants, data centers, renewable energy facilities, and transportation systems, helping improve operational reliability while reducing maintenance costs and unplanned downtime.

Acrel APD300-L Wired Partial Discharge Sensor

The APD300-L Wired Partial Discharge Sensor is an intelligent online monitoring device developed for the condition monitoring of medium-voltage switchgear. It integrates partial discharge detection, temperature monitoring, and humidity monitoring into a single compact unit, enabling continuous assessment of the insulation status and operating environment inside switchgear. By detecting early insulation defects before they develop into serious failures, the sensor helps improve power system reliability, reduce unplanned outages, and support predictive maintenance.