| Quantity: | |
|---|---|
The EOCR-3DE/3EZ Digital Overcurrent Relay is an advanced intelligent protection device engineered to safeguard industrial electric motors from overload, short circuit, phase failure, locked rotor and other abnormal operating conditions. Combining digital monitoring technology with precise tripping mechanisms, it features a backlit LCD display for real-time parameter visualization and menu-driven programming. Equipped with Hall-effect sensors offering ±1% current sensing accuracy, it eliminates thermal drift and ensures consistent protection performance. The built-in RS485 Modbus RTU communication interface enables seamless integration with PLCs and SCADA systems, supporting remote monitoring and control. With 35mm Din-rail mounting design, it is compact and easy to install, becoming an essential component for industrial motor control and protection systems.
This intelligent industrial motor protection relay provides full-scope fault protection, covering over-current, under-current, phase loss, phase unbalance, phase reversal and locked rotor faults. The EOCR-3EZ model adds ground fault protection, with ultra-fast tripping within 20ms for faults exceeding 6× rated current to minimize motor damage and production downtime.
Hall-effect sensing technology delivers ±1% accurate current measurement, and the relay monitors up to 8 key operating parameters including three-phase current, voltage, power factor and operating hours. This data support enables predictive maintenance and efficient equipment management for industrial users.
The RS485 Modbus RTU interface allows remote parameter configuration, status monitoring and fault record query. This RS485 Modbus digital overcurrent relay integrates smoothly into industrial control networks, realizing intelligent unmanned monitoring for motor drive systems.
The energy-saving mode reduces coil power consumption by 50% during normal operation, complying with international industrial energy efficiency standards. The intuitive programming interface and clear fault indication simplify on-site installation, debugging and troubleshooting work.
EOCR-3DE | EOCR-3EZ | ||
Protective Item | Trip Time | Protective Item | Trip Time |
Over-current | O-TIME | Over-current | O-TIME |
under-current | 0.5~30sec | Under-current | 0.5~30sec |
Phase Loss | 3 sec | Phase Loss | 3 sec |
Phase Unbalance | 8 sec | Phase Unbalance | 8 sec |
Phase Reversal | 0.1~0.3 sec | Phase Reversal | 0.1~0.3 sec |
Locked Rotor | D-TIME | Locked Rotor | D-TIME |
- | - | Ground Fault | 0.05~10 sec |
Model | EOCR-3DE | EOCR-3EZ | |
Over Current Setting Range | Refer Table #1 | ||
Ground Fault Current Setting | - | 0.02 ~ 3A | |
Alert Setting | 50 ~ 100% / OFF | - | |
Start Delay Time Setting (D-TIME) | 1 ~ 200 Sec | ||
Trip Delay Time Setting (O-TIME) | INV | 1 ~ 30 | |
DEF | 0.2 ~ 30 Sec | ||
Control Voltage | 24VAC/DC, 110VAC±15%, 220VAC±15% | ||
Output Relay | OL | 2-SPST | 1-SPST |
AL/GR | AL Relay | Ground Fault Relay | |
Rating | 3A/250VAC Resistive | ||
Time Characteristic | In/”tc ”mode | Inverse (See Curve-1) | |
dE/”tc ”mode | Definite (See Curve-2) | ||
Troubleshooting / Trip Indication | LED Display (SSD+LED) | ||
Current Sensing | 3-CT | ||
Mounting | 35mm Din-rail | ||
Current Setting Range (Amps) | Number of Conductors thru CT windows | Extermal CT Ratio | Setting of CT Ratio | Remark |
0.5 ~ 60A | 1 | - | OFF(Mode : --) | Wide Range |
0.25 ~ 3.0A | 2 | - | 2t | |
0.1 ~ 1.2A | 5 | - | 5t | |
1 ~ 12A | 1 | 10 : 5 | 10 | |
1.5 ~ 18A | 1 | 15 : 5 | 15 | |
2.0 ~ 24A | 1 | 20 : 5 | 20 | |
2.5 ~ 30A | 1 | 25 : 5 | 25 | |
3.0 ~ 36A | 1 | 30 : 5 | 30 | |
4.0 ~ 48A | 1 | 40 : 5 | 40 | |
5 ~ 60A | 1 | 50 : 5 | 50 | |
6 ~ 72A | 1 | 60 : 5 | 60 | |
7.5 ~ 90A | 1 | 75 : 5 | 75 | |
10 ~ 120A | 1 | 100 : 5 | 100 | |
12 ~ 144A | 1 | 120 : 5 | 120 | |
15 ~ 180A | 1 | 150 : 5 | 150 | |
20 ~ 240A | 1 | 200 : 5 | 200 | |
25 ~ 300A | 1 | 250 : 5 | 250 | |
30 ~ 360A | 1 | 300 : 5 | 300 | |
40 ~ 480A | 1 | 400 : 5 | 400 | |
50 ~ 600A | 1 | 500 : 5 | 500 | |
60 ~ 720A | 1 | 600 : 5 | 600 | |
75 ~ 900A | 1 | 750 : 5 | 750 | |
80 ~ 960A | 1 | 800 : 5 | 800 |
This high-precision motor fault protection relay is widely applied in key industrial fields. It protects induction motors in motor control centers for pumps, fans and compressors in manufacturing and water treatment plants. It collaborates with PLC systems in industrial automation lines to realize real-time fault detection and avoid unexpected shutdowns. It safeguards large motors in HVAC chillers and air handling units for commercial and industrial buildings, and protects drive motors in wind turbines and solar tracking systems against voltage fluctuations and overloads in renewable energy projects.
We offer personalized protection solutions for motor equipment manufacturers and engineering contractors. Customization options include adjustable current ranges, dedicated communication protocols, branded shell design and enhanced protection logic. Full OEM/ODM services are provided with compliance to international industrial electrical standards, perfectly adapting to the architecture and functional requirements of different motor control systems.
The relay monitors up to 8 core real-time parameters, including three-phase current, voltage, power factor and cumulative operating hours of the motor.
It supports induction motors, synchronous motors and DC motors, with adjustable settings for rated current and starting characteristics to fit various motor models.
Basic models store the last 10 fault records, while advanced versions provide trend logging and complete event history for predictive maintenance and fault analysis.
Phase failure protection acts quickly with a tripping time of 3 seconds to prevent motor burnout caused by single-phase operation.
The EOCR-3DE/3EZ Digital Overcurrent Relay is an advanced intelligent protection device engineered to safeguard industrial electric motors from overload, short circuit, phase failure, locked rotor and other abnormal operating conditions. Combining digital monitoring technology with precise tripping mechanisms, it features a backlit LCD display for real-time parameter visualization and menu-driven programming. Equipped with Hall-effect sensors offering ±1% current sensing accuracy, it eliminates thermal drift and ensures consistent protection performance. The built-in RS485 Modbus RTU communication interface enables seamless integration with PLCs and SCADA systems, supporting remote monitoring and control. With 35mm Din-rail mounting design, it is compact and easy to install, becoming an essential component for industrial motor control and protection systems.
This intelligent industrial motor protection relay provides full-scope fault protection, covering over-current, under-current, phase loss, phase unbalance, phase reversal and locked rotor faults. The EOCR-3EZ model adds ground fault protection, with ultra-fast tripping within 20ms for faults exceeding 6× rated current to minimize motor damage and production downtime.
Hall-effect sensing technology delivers ±1% accurate current measurement, and the relay monitors up to 8 key operating parameters including three-phase current, voltage, power factor and operating hours. This data support enables predictive maintenance and efficient equipment management for industrial users.
The RS485 Modbus RTU interface allows remote parameter configuration, status monitoring and fault record query. This RS485 Modbus digital overcurrent relay integrates smoothly into industrial control networks, realizing intelligent unmanned monitoring for motor drive systems.
The energy-saving mode reduces coil power consumption by 50% during normal operation, complying with international industrial energy efficiency standards. The intuitive programming interface and clear fault indication simplify on-site installation, debugging and troubleshooting work.
EOCR-3DE | EOCR-3EZ | ||
Protective Item | Trip Time | Protective Item | Trip Time |
Over-current | O-TIME | Over-current | O-TIME |
under-current | 0.5~30sec | Under-current | 0.5~30sec |
Phase Loss | 3 sec | Phase Loss | 3 sec |
Phase Unbalance | 8 sec | Phase Unbalance | 8 sec |
Phase Reversal | 0.1~0.3 sec | Phase Reversal | 0.1~0.3 sec |
Locked Rotor | D-TIME | Locked Rotor | D-TIME |
- | - | Ground Fault | 0.05~10 sec |
Model | EOCR-3DE | EOCR-3EZ | |
Over Current Setting Range | Refer Table #1 | ||
Ground Fault Current Setting | - | 0.02 ~ 3A | |
Alert Setting | 50 ~ 100% / OFF | - | |
Start Delay Time Setting (D-TIME) | 1 ~ 200 Sec | ||
Trip Delay Time Setting (O-TIME) | INV | 1 ~ 30 | |
DEF | 0.2 ~ 30 Sec | ||
Control Voltage | 24VAC/DC, 110VAC±15%, 220VAC±15% | ||
Output Relay | OL | 2-SPST | 1-SPST |
AL/GR | AL Relay | Ground Fault Relay | |
Rating | 3A/250VAC Resistive | ||
Time Characteristic | In/”tc ”mode | Inverse (See Curve-1) | |
dE/”tc ”mode | Definite (See Curve-2) | ||
Troubleshooting / Trip Indication | LED Display (SSD+LED) | ||
Current Sensing | 3-CT | ||
Mounting | 35mm Din-rail | ||
Current Setting Range (Amps) | Number of Conductors thru CT windows | Extermal CT Ratio | Setting of CT Ratio | Remark |
0.5 ~ 60A | 1 | - | OFF(Mode : --) | Wide Range |
0.25 ~ 3.0A | 2 | - | 2t | |
0.1 ~ 1.2A | 5 | - | 5t | |
1 ~ 12A | 1 | 10 : 5 | 10 | |
1.5 ~ 18A | 1 | 15 : 5 | 15 | |
2.0 ~ 24A | 1 | 20 : 5 | 20 | |
2.5 ~ 30A | 1 | 25 : 5 | 25 | |
3.0 ~ 36A | 1 | 30 : 5 | 30 | |
4.0 ~ 48A | 1 | 40 : 5 | 40 | |
5 ~ 60A | 1 | 50 : 5 | 50 | |
6 ~ 72A | 1 | 60 : 5 | 60 | |
7.5 ~ 90A | 1 | 75 : 5 | 75 | |
10 ~ 120A | 1 | 100 : 5 | 100 | |
12 ~ 144A | 1 | 120 : 5 | 120 | |
15 ~ 180A | 1 | 150 : 5 | 150 | |
20 ~ 240A | 1 | 200 : 5 | 200 | |
25 ~ 300A | 1 | 250 : 5 | 250 | |
30 ~ 360A | 1 | 300 : 5 | 300 | |
40 ~ 480A | 1 | 400 : 5 | 400 | |
50 ~ 600A | 1 | 500 : 5 | 500 | |
60 ~ 720A | 1 | 600 : 5 | 600 | |
75 ~ 900A | 1 | 750 : 5 | 750 | |
80 ~ 960A | 1 | 800 : 5 | 800 |
This high-precision motor fault protection relay is widely applied in key industrial fields. It protects induction motors in motor control centers for pumps, fans and compressors in manufacturing and water treatment plants. It collaborates with PLC systems in industrial automation lines to realize real-time fault detection and avoid unexpected shutdowns. It safeguards large motors in HVAC chillers and air handling units for commercial and industrial buildings, and protects drive motors in wind turbines and solar tracking systems against voltage fluctuations and overloads in renewable energy projects.
We offer personalized protection solutions for motor equipment manufacturers and engineering contractors. Customization options include adjustable current ranges, dedicated communication protocols, branded shell design and enhanced protection logic. Full OEM/ODM services are provided with compliance to international industrial electrical standards, perfectly adapting to the architecture and functional requirements of different motor control systems.
The relay monitors up to 8 core real-time parameters, including three-phase current, voltage, power factor and cumulative operating hours of the motor.
It supports induction motors, synchronous motors and DC motors, with adjustable settings for rated current and starting characteristics to fit various motor models.
Basic models store the last 10 fault records, while advanced versions provide trend logging and complete event history for predictive maintenance and fault analysis.
Phase failure protection acts quickly with a tripping time of 3 seconds to prevent motor burnout caused by single-phase operation.
