Editorial Technical Reference

Protection Relay Module

This page explains how Protection Relay Module is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A specialized electronic module within a microgrid controller that monitors electrical parameters and triggers protective actions during fault conditions.

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Product Specifications

Technical details and manufacturing context for Protection Relay Module

Definition
The Protection Relay Module is a critical component of a Microgrid Controller responsible for continuously monitoring voltage, current, frequency, and other electrical parameters within the microgrid system. When it detects abnormal conditions such as overcurrent, under/over voltage, frequency deviations, or ground faults, it sends trip signals to circuit breakers or other protective devices to isolate the faulted section, preventing equipment damage and ensuring system stability. The module is designed for DIN rail mounting and operates within a specified ambient temperature range of -40 to 85 °C and non-condensing relative humidity of 5 to 95% RH. It features an ingress protection rating of IP54 to IP65, suitable for industrial environments. The rated voltage is 24 V DC ±10%, and the rated current for measurement inputs is 5 A, with a nominal frequency of 50/60 Hz. Overcurrent accuracy is ±0.5%, and the response time for overcurrent faults is ≤10 ms. The module withstands a dielectric strength of 2 kV between circuits and ground, and has a minimum insulation resistance of ≥100 MΩ at 500 V DC. Dimensions are 120×75×30 mm, and weight is ≤0.5 kg. The module is constructed with a printed circuit board, semiconductor components (microprocessors, memory chips), electromechanical or solid-state relays, copper conductors, and a plastic housing. It complies with IEC 60255-1 for relay protection and IEC 60068-2-1/2 for temperature testing, and IEC 60068-2-78 for humidity testing, and IEC 60529 for ingress protection. These standards serve as procurement references; actual compliance must be verified with the manufacturer. For specific applications, confirm model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The module operates by continuously sampling electrical signals through sensors (CTs, PTs). These signals are processed by analog-to-digital converters and analyzed by microprocessor-based algorithms. When measured values exceed predefined thresholds or match fault patterns, the module's logic circuits activate output relays that send trip commands to protective switching devices, while also providing alarm signals and event logging.
Common Materials
Printed Circuit Board (PCB), Semiconductor components (microprocessors, memory chips), Electromechanical relays or solid-state relays, Copper conductors, Plastic housing
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Voltage24 ±10% V DCOperating range for control and monitoringIEC 60255-1
Rated Current5 AContinuous current rating for measurement inputsIEC 60255-1
Frequency50/60 HzNominal system frequencyIEC 60255-1
Overcurrent Accuracy±0.5 %Accuracy class for overcurrent protectionIEC 60255-1
Operating Temperature-40–85 °CAmbient temperature range for reliable operationIEC 60068-2-1/2
Humidity5–95 % RHNon-condensing relative humidity rangeIEC 60068-2-78
Ingress ProtectionIP54–IP65Protection against dust and water jetsIEC 60529
Dielectric Strength2 kVWithstand voltage between circuits and groundIEC 60255-1
Insulation Resistance≥100 MΩMinimum insulation resistance at 500 V DCIEC 60255-1
Response Time≤10 msTime to trip for overcurrent faultsIEC 60255-1
Dimensions120×75×30 mmCompact module for DIN rail mounting
Weight≤0.5 kgLightweight for easy installation

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Signal Conditioning Circuit
    Filters and scales input signals from current/voltage transformers to appropriate levels for processing
    Material: PCB with precision resistors, capacitors, and operational amplifiers
  • Microprocessor Unit
    Executes protection algorithms, processes measurements, and makes trip decisions
    Material: Semiconductor chip with embedded firmware
  • Output Relay
    Electromechanical or solid-state switch that activates to send trip signals to circuit breakers
    Material: Copper contacts, electromagnetic coil, plastic housing
  • Power Supply Unit
    Converts input power to regulated DC voltages required by internal circuits
    Material: Transformer, rectifiers, voltage regulators, capacitors
  • Fault Patterns
    The stored fault signatures the measured values are matched against before tripping.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Protection Relay Module.

Protective Relay Module Microgrid Protection Module

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Microgrid Controller
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
current: Up to 5A continuous, 100A short-term
voltage: Up to 690V AC, 1000V DC
humidity: 0-95% non-condensing
frequency: 45-65Hz
temperature: -40°C to +85°C
Media Compatibility
✓ Clean indoor electrical cabinets ✓ Industrial control panels with filtered air ✓ Weatherproof enclosures with proper sealing
Unsuitable: Direct exposure to conductive dust, corrosive gases, or salt spray environments
Sizing Data Required
  • System nominal voltage and frequency
  • Maximum fault current available
  • Required protection functions (overcurrent, earth fault, etc.)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact Welding
Cause: Excessive current surges or short-circuit events causing relay contacts to fuse together, preventing proper opening/closing.
Coil Burnout
Cause: Overvoltage conditions, prolonged energization beyond rated duty cycle, or insulation degradation due to thermal stress or moisture ingress.
Maintenance Indicators
  • Audible buzzing or chattering from the relay during operation
  • Visible discoloration, charring, or melting on the relay housing or terminals
Engineering Tips
  • Implement regular infrared thermography scans to detect abnormal heating at connections and internal components before failure occurs.
  • Maintain clean, dry environments with proper ventilation and use voltage surge protection devices to prevent electrical stress on relay components.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60255 (International Electrotechnical Commission) - Electrical relays ANSI/IEEE C37.90 - Relays and relay systems associated with electric power apparatus EN 60255 (European Norm) - Measuring relays and protection equipment

Quoted from the published standard.

Manufacturing Precision
  • Operating time accuracy: +/- 2% of set value or +/- 10ms
  • Contact resistance: < 50 milliohms for main contacts
Quality Inspection
  • Dielectric strength test (high voltage withstand test)
  • Functional performance test with simulated fault conditions

Manufacturers of Protection Relay Module

Manufacturer profiles associated with Protection Relay Module.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

Technical documentation
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Frequently Asked Questions

What electrical parameters does the protection relay module monitor?

It monitors voltage, current, frequency, and other electrical parameters within the microgrid system, detecting overcurrent, under/over voltage, frequency deviations, and ground faults.

What is the response time for overcurrent faults?

The response time is ≤10 ms, as per the specified parameter, but actual performance should be verified for the specific model and application.

What are the environmental operating limits?

The module operates in ambient temperatures from -40 to 85 °C and non-condensing relative humidity of 5 to 95% RH, with an ingress protection rating of IP54 to IP65.

Which standards apply to this module?

Relevant standards include IEC 60255-1 for protection relays, IEC 60068-2-1/2 for temperature, IEC 60068-2-78 for humidity, and IEC 60529 for ingress protection. These are references; compliance must be confirmed with the manufacturer.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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