Product Overview

The ALSTOM IR139-1​is an electromechanical overcurrent protection relay designed for reliable circuit protection in electrical distribution systems.This robust protection device forms part of ALSTOM’s comprehensive protection relay portfolio,providing time-delayed overcurrent and earth fault protection for feeders,transformers,and motors.The IR139-1​combines proven electromechanical technology with durable construction to deliver dependable performance in utility and industrial electrical networks where simplicity and reliability are paramount.

In electrical distribution systems,the ALSTOM IR139-1​typically serves as a fundamental protection component for medium-voltage circuits,implementing inverse-time overcurrent characteristics that coordinate with other protective devices in the network.The relay’s robust induction disk mechanism provides reliable time-current response characteristics,ensuring selective coordination while maintaining equipment protection.The IR139-1​demonstrates excellent performance in industrial plants,utility substations,and commercial power systems,where its straightforward operation and minimal maintenance requirements make it suitable for applications requiring long-term reliability.Its durable construction ensures consistent performance over decades of service in diverse environmental conditions.

Technical Specifications

Parameter Name

Parameter Value

Product Model

IR139-1​

Manufacturer

ALSTOM

Product Type

Electromechanical Overcurrent Relay

Rated Current

1A or 5A(configurable)

Current Setting

50-200%in steps

Time Multiplier

0.1-1.0 in 0.05 steps

Characteristic

Standard Inverse(IEC 60255)

Operating Time

0.5-10 seconds at 2x setting

Reset Time

<20 seconds

Burden

1VA at setting

Rated Frequency

50/60Hz

Rated Voltage

110V AC/DC auxiliary

Contacts

1 NO+1 NC

Mechanical Life

10,000 operations

Dielectric Strength

2kV RMS for 1 minute

Operating Temperature

-20°C to+55°C

Storage Temperature

-40°C to+70°C

Mounting

Flush panel mounting

Weight

2.1kg

Standards

IEC 60255,BS 142

Main Features and Advantages

The ALSTOM IR139-1​incorporates a precision induction disk mechanism that provides reliable inverse-time characteristics for overcurrent protection.The relay’s magnetic damping system ensures smooth disk rotation and consistent timing accuracy across the entire operating range.Transparent cover allows visual inspection of operation while providing protection from dust and contaminants.The IR139-1’s simple design ensures long-term reliability with minimal maintenance requirements,making it suitable for remote installations where regular servicing is challenging.

Operational flexibility is enhanced through the relay’s adjustable current setting and time multiplier dials,allowing precise coordination with other protective devices in the system.The IR139-1​features a flag indicator that provides clear trip indication,facilitating quick fault identification and system restoration.The relay’s robust construction with high-quality bearings and precision-machined components ensures consistent performance even after long periods of inactivity.Its compatibility with standard CT ratios and simple installation requirements make it ideal for both new installations and system upgrades.

Application Field

The ALSTOM IR139-1​finds extensive application in electrical distribution systems requiring reliable overcurrent protection.In utility networks,the relay protects distribution feeders and transformer circuits,providing graded protection that ensures selective fault clearance.Industrial plants utilize the IR139-1​for motor circuit protection,where its definite-time characteristics prevent damage during overload conditions.

The relay is particularly valuable in rural electrification projects,where its simplicity and reliability ensure continuous operation despite limited maintenance capabilities.Mining operations employ the IR139-1​for protection of conveyor systems and pumping stations,benefiting from its robust construction that withstands vibration and contaminated environments.Water treatment plants use the relay for pump protection,where its proven technology ensures long-term reliability in critical infrastructure applications.The relay’s affordability and ease of use make it suitable for educational and training facilities demonstrating power system protection principles.

Related Products

IR139-2:High-set instantaneous version

IR140:Earth fault protection version

IR150:Combined overcurrent and earth fault relay

CDG11:Advanced electromechanical relay

CDD11:Directional overcurrent relay

CAG14:Auxiliary relay units

Test Plug:Testing and maintenance accessory

Case:Mounting enclosure options

Installation and Maintenance

Installation preparation:Before installing the IR139-1,verify CT ratios and coordination requirements.Ensure proper mounting surface preparation and have appropriate test equipment ready for calibration.Check the relay settings against coordination study results.

Maintenance recommendations:Perform annual operation tests to verify timing characteristics.Regularly inspect for dust accumulation and clean the transparent cover.Test mechanical operation and contact alignment during routine maintenance.Maintain records of test results and setting changes for future reference.

Product Guarantee

We guarantee that every ALSTOM IR139-1​is a genuine product manufactured to the highest quality standards.Our technical team provides comprehensive support including coordination studies,installation guidance,and maintenance services to ensure optimal performance in your electrical protection system.All relays undergo rigorous testing to verify they meet original manufacturer specifications for reliability and performance in power system protection applications.

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