Digital Earth Leakage Relay, Din Rail
Digital Earth Leakage Relay (ELR), DIN Rail Mount, Adjustable mA & Delay Settings
A digital earth leakage relay for 1-phase and 3-phase systems, featuring adjustable leakage trip settings, programmable delays, and compatibility with CBCT toroids for high-accuracy protection.
This Digital Earth Leakage Relay (ELR) is designed for precise monitoring of leakage currents in single-phase and three-phase electrical systems. With adjustable trip settings, programmable delays, and a clear digital display, it provides fast and reliable protection for personnel, equipment, and electrical installations. The relay works in combination with an external CBCT (Core Balance Current Transformer), making it suitable for industrial, commercial, and residential protection panels.
Key Features
Digital leakage measurement with real-time mA indication
Adjustable trip current (30 mA to 30 A depending on model)
Configurable delays—trip delay, power-on delay, reset delay
DIN-rail mounting for easy integration into control panels
CBCT compatible (external toroid for accurate leakage sensing)
Relay output (SPDT) for tripping circuit breakers, MCCBs, or alarms
Works with 1-phase and 3-phase systems
LED indicators and digital display for status and settings
Prevents electric shock, insulation failure, and fire hazards
Technical Specifications
| Parameter | Specification |
|---|---|
| System Type | 1-phase or 3-phase |
| Measurement | Earth leakage current via CBCT |
| Leakage Trip Setting | Adjustable (30 mA – 30 A) |
| Trip Delay | Adjustable (0–10 sec or higher depending on model) |
| Power-On Delay | Adjustable (0–10 sec) |
| Reset Mode | Manual/Auto |
| Display | Digital LED/LCD depending on variant |
| Relay Output | 1 × SPDT (5A @ 250V AC typical) |
| Supply Voltage | 110–240V AC (model dependent) |
| Mounting | DIN rail 35 mm |
| Indicators | Leakage alarm, relay status, power ON |
| Accuracy | High sensitivity measurement for mA-level faults |
| Compatible CBCT | 30 mm, 60 mm, and 100mm toroids (model dependent) |
| Protection Type | Earth leakage detection & circuit isolation |
| Operating Temperature | –10°C to +55°C |
| Application Type | Industrial, commercial, residential |
Applications
Motor control centers (MCC)
Industrial machinery
HVAC & compressor panels
Commercial distribution boards
Residential protection panels
Pump panels
Insulation failure & fire hazard protection
Human safety against indirect contact
What’s in the Box?
1 × Digital Earth Leakage Relay
User manual
Mounting clips (if applicable)
Warranty leaflet
FAQ
Q1: Does this ELR work with any CBCT (toroid)?
Yes, it supports external CBCTs. Select the toroid size based on cable diameter and system current.
Q2: What trip current range can I set?
The typical range is 30 mA to 30 A depending on the model variant.
Q3: Can this ELR be used in 3-phase systems?
Yes, it supports both 1-phase and 3-phase leakage monitoring.
Q4: Does the relay automatically reset after a trip?
Yes, auto and manual reset modes are available.
Q5: Is it suitable for residential applications?
Yes, especially for high-sensitivity shock protection.
Q6: What type of relay output is provided?
1 × SPDT relay output for breaker tripping or alarm signaling.