WOODWARD IRI1ER1LD Earth Current Relay (Without Disc) – 24V, 50/60Hz
Product Overview
The WOODWARD IRI1ER1LD Earth Current Relay (Without Disc) is a precision protection relay designed for reliable earth fault detection in industrial power systems. Operating on 24V control voltage with 50/60Hz frequency compatibility, this relay monitors residual (earth) current and provides fast, stable tripping signals when fault thresholds are exceeded.
The disc-less design improves response accuracy, reduces mechanical wear, and ensures consistent performance over long service intervals. Built for demanding environments, the IRI1ER1LD integrates seamlessly into protection schemes for generators, motors, transformers, and distribution networks.
Key Features
- Disc-less earth current protection for high accuracy
- 24V control supply with 50/60Hz compatibility
- Stable pickup and repeatable trip characteristics
- Robust construction for industrial environments
- Low maintenance and long operational life
- Easy integration into existing protection panels
Product Parameters & Datasheet
| Parameter | Specification |
|---|---|
| Model | IRI1ER1LD |
| Product Type | Earth Current Relay (Residual Current) |
| Design | Without disc |
| Control Voltage | 24V AC/DC (system dependent) |
| Rated Frequency | 50/60Hz |
| Measuring Input | Residual current from CT |
| Pickup Setting Range | Adjustable (application dependent) |
| Time Delay | Definite / adjustable |
| Output Contacts | Relay changeover contacts |
| Contact Rating | Industrial control level |
| Accuracy Class | High-precision protection |
| Response Time | Fast tripping response |
| Mounting | Panel-mounted |
| Operating Temperature | -10°C to +55°C |
| Storage Temperature | -25°C to +70°C |
| Humidity | 5–95% RH, non-condensing |
| Housing | Industrial-grade enclosure |
| Protection Function | Earth fault / ground fault |
| Origin | USA |
Applications
The WOODWARD IRI1ER1LD Earth Current Relay is widely used in:
- Generator Protection Systems
- Industrial Motor Protection Panels
- Transformer Earth Fault Protection
- Power Distribution Networks
- Marine and Offshore Power Systems
- Energy and Utility Substations
Installation and Usage Instructions
- Power Off: Ensure the control circuit is fully isolated before installation.
- Mounting: Secure the relay firmly onto the control panel using standard mounting hardware.
- CT Connection: Connect the residual current transformer to the relay input terminals.
- Supply Wiring: Apply the 24V control supply to the designated terminals.
- Settings: Adjust pickup current and time delay according to system protection requirements.
- Commissioning: Energize the system and verify relay operation using secondary injection or test methods.
- Maintenance: Periodically check wiring tightness and functional response.
Technical Description
The IRI1ER1LD earth current relay continuously measures residual current derived from connected current transformers. When an earth fault occurs, the relay compares the measured current against a preset threshold and issues a trip signal once conditions are met.
Its disc-less electronic design eliminates mechanical inertia, enabling faster detection and improved sensitivity. Internal circuitry is optimized for noise immunity and stable operation across a wide frequency range, ensuring dependable protection in both steady-state and transient conditions.
Recommended WOODWARD Relay & Protection Models
| Model | Type | Voltage | Application |
|---|---|---|---|
| IRI1ER1LA | Earth Current Relay | 24V | Generator protection |
| IRI1ER1LB | Earth Current Relay | 48V | Motor systems |
| IRI1ER1LC | Earth Current Relay | 110V | Industrial panels |
| IRI1ER1LD | Earth Current Relay | 24V | Ground fault detection |
| IRI1ER2LA | Earth Fault Relay | 24V | Distribution systems |
| IRI1ER2LB | Earth Fault Relay | 48V | Transformer protection |
| IRI1ER2LC | Earth Fault Relay | 110V | Utility substations |
| IRI1OC1LA | Overcurrent Relay | 24V | Motor protection |
| IRI1OC1LB | Overcurrent Relay | 48V | Generator protection |
| IRI1OC1LC | Overcurrent Relay | 110V | Feeder protection |
| IRI1UV1LA | Undervoltage Relay | 24V | Power monitoring |
| IRI1UV1LB | Undervoltage Relay | 48V | Control systems |
| IRI1OV1LA | Overvoltage Relay | 24V | Grid protection |
| IRI1OV1LB | Overvoltage Relay | 48V | Industrial networks |
| IRI1FR1LA | Frequency Relay | 24V | Generator control |
| IRI1FR1LB | Frequency Relay | 48V | Power plants |
| IRI1PF1LA | Power Factor Relay | 24V | Energy systems |
| IRI1PF1LB | Power Factor Relay | 48V | Industrial automation |
| IRI1DF1LA | Differential Relay | 24V | Transformer protection |
| IRI1DF1LB | Differential Relay | 48V | High-reliability systems |
For sourcing, replacement, or technical support, visit:
www.dcsplcsystem.com
★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★
One year warranty, special discount after sale
The company focuses on DCS, PLC, robot, large servo four systems
The main products are all kinds of module/card, controller, touch screen, servo drive
The company’s advantages: the supply of imported original products, professional production of accessories
Fast delivery time, complete supply, The seller has more than $1526000 worth of industrial control products inventory
We Can transport to the world！！！
——————————————————————————————————————
[service contact information]
Purchase and consultation hotline: +8613365909307 (Whatsapp/ Wechat)
E-mail: dcsplcsales@gmail.com
Contact Person: Simon
① 24-hour email reply (12 hours);
② For shipment to countries outside Asia, please contact the seller.
E-mail:dcsplcsales@gmail.com
Wechat:+86 13365909307
Phone:+86 13365909307