● Integrate leakage, overload and earth fault protection
● Inverse-time Overcurrent & Earth-fault (51/51G)
● Three-stage Definite-time Overcurrent & Earth-fault (50/51 50N/51N)
● Current Unbalance Protection (46)
● Residual Current Monitoring (50G)
● Modbus-RTU communication; LCD display
● Suitable for AC 690V and below low-voltage switchgear, distribution panels and feeder circuits.
General
Acrel ALP220-EF Earth Fault Overcurrent 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.
Front Panel
Dimension
External Dimension & Side View Dimension & Installation Opening Dimension
Wiring
Three-Phase Four-Wire Connection
Three-Phase Three-Wire Connection
Application
| Technical parameter | Qualification | ||
| Accessory power supply | Voltage range | AC/DC 85～265V | |
| Power dissipation | |||
| Import | Current specifications | ABCN (4-channel): 1A/5A | 10%Ie～1000%Ie ±2% |
|
Residual current
specification
|
30mA-1000mA | ±2% | |
| Frequency | 45Hz-65Hz | ±0.2Hz | |
| Output | Output method | Dual-channel single-pole double-throw switch | |
| Output capacity | Resistive load; AC 250 V 5 A / DC 30 V 5 A | ||
|
Installation and
Usage Environment
|
Workplace Scenario | No direct exposure to rain or snow; no corrosive gases; no severe vibration | |
| Relative humidity | ≤95% RH, no condensation | ||
| Working temperature | -20℃~+70℃ | ||
| Storage temperature | -40℃~+70℃ | ||
| Height | ≤2000m | ||
| Way to install | Embedded installation: 88×88 (mm) | ||
| Levels of protection | Panel: IP54; Terminals: IP20 | ||
| Security classification | EMC | Level III | |
| Function | Standard configuration | Optional | |
| Measurement Function | Three-phase alternating current | √ | |
| Neutral conductor current | √ | ||
| Residual current | √ | ||
| Defencive function | Inverse-time overcurrent protection | √ | |
| Inverse Time Grounding | √ | ||
|
Three-stage time-delayed
overcurrent protection
|
√ | ||
|
Three-stage time-delayed
ground fault protection
|
√ | ||
| Current imbalance | √ | ||
| Leakage current | √ | ||
| Communication Function | Modbus-RTU | √ | |
| Digital output function | 2 Single-pole double-throw switch | √ | |
| Record Function | 20 Single fault record | √ | |
| 20 Event Record | √ | ||
| Display Function | Liquid-crystal display | √ | |
|
Setpoint Setting Function
|
Operation Panel Modification | √ | |
| Communication Amendment | √ | ||
