Reliable and Accurate Monitoring Relays for Electrical Protection

A monitoring relay plays a crucial role in modern electrical and industrial systems, ensuring that voltage levels and phase conditions remain within safe operating limits. PCP electric offers a complete range of monitoring relays engineered to deliver precise voltage supervision, fault detection, and protection for sensitive electrical and electronic equipment and protecting circuits and Contactors .

These relays continuously monitor parameters such as overvoltage, undervoltage, phase failure, phase sequence, and phase asymmetry, ensuring that connected systems remain safe from electrical anomalies. Whether used in industrial automation, building management, or renewable energy systems, ELKO EP monitoring relays provide dependable protection and performance.

Key Features of Monitoring Relays

1. Wide Voltage Monitoring Range

ELKO EP monitoring relays are designed to monitor a broad range of voltage levels, making them suitable for single-phase and three-phase applications. This flexibility ensures compatibility with various electrical networks commonly used in Singapore’s commercial and industrial sectors.

• Supports both AC and DC inputs(24V, 48V, 110V, 230V, and 400V).
• Ideal for use with motors, pumps, compressors, and building automation systems.

2. Adjustable Thresholds for Precision Control

Every application has its own voltage tolerance requirements. That’s why ELKO EP monitoring relays come equipped with adjustable upper and lower thresholds, allowing users to set custom voltage limits for optimal protection.

• User-defined voltage limits enhance precision.
• Prevents false tripping in minor voltage fluctuations.

3. Multi-Functionality in One Device

Many ELKO EP models provide multi-functional protection, combining several monitoring features into a single unit.

• Overvoltage & Undervoltage Monitoring
• Phase Sequence & Phase Failure Detection
• Phase Asymmetry Monitoring

This multi-functional capability reduces the need for multiple devices, saving space and simplifying system design.

4. LED Indicators for Status Monitoring

Built-in LED indicators provide a clear, instant visual reference of relay status and voltage conditions. This feature simplifies troubleshooting and monitoring in complex electrical systems.

• LED display indicates normal operation, fault conditions, and delay timing.
• Aids maintenance personnel in quick diagnostics.

5. DIN Rail Mounting for Easy Installation

ELKO EP monitoring relays are designed with DIN rail mounting capability, ensuring simple and quick installation within control panels and switchboards.

• Compatible with standard 35mm DIN rails.
• Compact design saves valuable space in electrical enclosures.

6. Relay Output for Control Integration

Most models include SPDT (Single Pole Double Throw) relay outputs, enabling them to control other equipment or activate alarms based on detected voltage conditions.

• Switching capacity up to 5A at 250V AC.
• Integrates easily into automation and protection circuits.

7. Protection Features

Time-delay and hysteresis settings are included to prevent nuisance tripping caused by minor voltage variations. This ensures smooth and reliable operation, even in fluctuating supply environments.

• Adjustable time delay (0.1–10s) to prevent false alarms.
• Adjustable hysteresis improves stability during small voltage changes.

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Technical Specifications

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Popular ELKO EP Monitoring Relay Models

ELKO EP HRN-43

• Monitoring: Overvoltage and undervoltage
• Voltage Range: 3×400V AC
• Relay Output: 1 SPDT
• Key Features: Adjustable thresholds, LED indicators, and built-in delay

ELKO EP HRN-54

• Monitoring: Phase failure, sequence, and asymmetry
• Voltage Range: 3×400V AC
• Relay Output: 1 SPDT
• Key Features: Adjustable asymmetry percentage, visual LED display, and time delay setting

ELKO EP HRN-100

• Monitoring: Overvoltage, undervoltage, and phase failure
• Voltage Range: 3×400V AC
• Relay Output: 2 SPDT
• Key Features: Multi-function protection, LED indicators, phase sequence detection

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Applications of Monitoring Relays

ELKO EP monitoring relays are used across multiple sectors to enhance equipment safety and operational reliability.

1. Industrial Automation

In manufacturing and automation systems, monitoring relays protect motors, conveyors, and pumps from voltage irregularities that can cause downtime or damage.

2. Building Automation

Building systems such as HVAC, elevators, and lighting networks rely on voltage monitoring relays to maintain a stable power supply and protect equipment from electrical faults.

3. Renewable Energy Systems

Used in solar and wind power plants, monitoring relays maintain voltage balance and detect fluctuations that can affect inverter and controller performance.

4. Telecommunications

Sensitive telecom equipment requires clean and stable power. Monitoring relays ensure that voltage anomalies do not interrupt data transmission or network operations.

5. General Electrical Protection

From small control cabinets to large industrial plants, monitoring relays form a vital part of electrical protection systems, ensuring consistent voltage delivery and enhanced operational safety.

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Benefits of Using Monitoring Relays

• Enhanced Protection: Safeguards motors, control panels, and sensitive devices from voltage and phase irregularities.
• Operational Reliability: Prevents costly downtime by detecting and responding to faults immediately.
• Flexible Configuration: Adjustable settings allow customization for any electrical system.
• Compact Design: Saves space and integrates easily into existing systems.
• Ease of Installation: DIN rail mounting ensures a quick and efficient setup process.

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Why Choose ELKO EP Monitoring Relays in Singapore

• European Quality, Local Availability: ELKO EP products are globally recognized for performance and reliability, with local distributors and support in Singapore.
• Comprehensive Product Range: Choose from multiple models to suit your application requirements.
• Durability: Designed to withstand Singapore’s tropical climate and industrial environments.
• After-Sales Support: Local technical support ensures seamless integration and operation.

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Frequently Asked Questions (FAQs)

1. What is a monitoring relay, and what does it do?

A monitoring relay is an electrical device used to supervise voltage, phase sequence, and other parameters in electrical systems. It helps protect equipment from damage caused by overvoltage, undervoltage, or phase failure.

2. How do I select the right monitoring relay for my application?

The right choice depends on the system’s voltage type (single or three-phase), required monitoring functions, and control load. Always check compatibility with your system voltage and environmental conditions before selecting a model.

3. Where are monitoring relays used in Singapore?

Monitoring relays are commonly used in industrial automation, building management, HVAC systems, renewable energy plants, and manufacturing facilities to maintain reliable voltage levels and equipment safety.

4. What are the benefits of using ELKO EP monitoring relays?

ELKO EP relays offer multi-function protection, adjustable settings, robust construction, and easy DIN-rail installation, ensuring reliability and safety across a variety of industrial and commercial applications.

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Conclusion

ELKO EP’s monitoring relays provide the reliability and precision required to safeguard electrical systems from voltage anomalies. Their robust design, flexible configuration, and advanced monitoring features make them ideal for modern automation, renewable energy, and building management systems.

With a focus on performance, durability, and safety, ELKO EP continues to be a trusted choice for monitoring relay solutions in Singapore and across the globe — ensuring stability, protection, and peace of mind in every electrical installation.