Editorial Technical Reference

Relay Board

This page explains how Relay Board 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 printed circuit board assembly containing multiple electromechanical or solid-state relays for switching electrical circuits in industrial control systems.

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Relay Board in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Relay Board

Definition
The Relay Board is a specialized printed circuit board assembly used within the Backwash Control Module of filtration systems. It houses and interconnects multiple relays to control the activation and sequencing of valves, pumps, and other electrical devices during backwash cycles. As the primary switching interface between the module's controller and field devices, it receives low-voltage control signals from a microprocessor or PLC, which energize the relay coils. When energized, the relay contacts close or open to switch higher-voltage AC or DC power to connected loads such as solenoid valves, motor starters, or indicator lights, enabling automated control of backwash sequences.

The board is constructed on an FR-4 glass epoxy laminate substrate with copper traces, populated with electromechanical relays, terminal blocks, and solder connections. It offers a range of configurations, with 4 to 32 relay output channels, switching voltages from 24 to 240 V AC/DC, and switching currents from 2 to 10 A per contact. The relay coils operate on control voltages from 5 to 24 V DC. Key electrical specifications include a contact resistance of ≤50 mΩ, insulation resistance of ≥100 MΩ at 500 V DC, and a dielectric strength of 1500 V AC for one minute between coil and contacts. The board operates within an ambient temperature range of -40 to 85 °C and can be stored at -40 to 100 °C, with non-condensing humidity from 5% to 95% RH. Depending on the enclosure, it offers ingress protection from IP20 to IP65 per IEC 60529. The PCB material is FR-4 per IPC-4101, with copper thickness from 35 to 70 µm per IPC-6012, and board dimensions ranging from 100×80 mm to 300×200 mm.

These values are directory reference ranges and must be confirmed for the specific model and application. Verify all specifications and standards with the legal manufacturer or supplier before procurement.
Working Principle
The Relay Board operates by receiving low-voltage control signals from the module's microprocessor or PLC. These signals energize the relay coils, which in turn close or open the relay contacts. This switching action controls higher-voltage AC or DC power to connected loads such as solenoid valves, motor starters, or indicator lights, enabling automated control of backwash sequences. The board provides electrical isolation between the control circuit and the switched circuit, ensuring safe and reliable operation.
Common Materials
FR-4 PCB substrate, Copper traces, Electromechanical relays, Terminal blocks, Solder
Technical Parameters
ParameterTypical rangeNotes & selection driver
Number of Channels4–32Number of relay outputs on the board.
Switching Voltage24–240 V AC/DCMaximum voltage each relay can switch.
Switching Current2–10 AMaximum current per relay contact.
Coil Voltage5–24 V DCControl voltage for relay coils.
Contact Resistance≤50 mΩInitial contact resistance per relay.
Insulation Resistance≥100 MΩBetween coil and contacts at 500 V DC.
Dielectric Strength1500 V ACWithstand voltage between coil and contacts for 1 min.
Operating Temperature-40–85 °CAmbient temperature range for reliable operation.
Storage Temperature-40–100 °CTemperature range for non-operating storage.
Humidity5–95 % RHNon-condensing relative humidity range.
Ingress ProtectionIP20–IP65Degree of protection against dust and water.IEC 60529
Board MaterialFR-4Glass epoxy laminate for PCB.IPC-4101
Copper Thickness35–70 µmThickness of copper foil on PCB traces.IPC-6012
Board Dimensions100×80–300×200 mmLength × width of the PCB.

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
  • PCB
    Provides mechanical support and electrical interconnection between components
    Material: FR-4 glass epoxy
  • Relays
    Electromechanical switches that open/close electrical circuits when control signals are applied
    Material: Copper coils, silver alloy contacts, plastic housing
  • Terminal Blocks
    Provide secure connection points for field wiring to relay contacts and control inputs
    Material: Polyamide plastic, brass terminals
  • LED Indicators Part
    Visual status indication for each relay channel (energized/de-energized)
    Material: LED chips, plastic lenses

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (sealed relays) or ambient (open-frame)
other spec: Switching capacity: 2A to 30A per channel, Control voltage: 5VDC to 240VAC, Isolation: 1500V to 4000V
temperature: -40°C to +85°C (operating), -55°C to +125°C (storage)
Media Compatibility
✓ Dry contact switching (resistive loads) ✓ Inductive loads (motors, solenoids) ✓ Capacitive loads (power supplies, lighting)
Unsuitable: Explosive atmospheres (unless specifically rated for hazardous locations)
Sizing Data Required
  • Load current per channel (A)
  • Control voltage type and level (VDC/VAC)
  • Number of switching channels required

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact Welding/Sticking
Cause: Excessive inrush current or arcing due to inductive loads, leading to contacts fusing together and failing to open
Coil Burnout/Open Circuit
Cause: Overvoltage, voltage spikes, or prolonged energization causing insulation breakdown or wire breakage in the solenoid coil
Maintenance Indicators
  • Audible buzzing or chattering from the relay during operation
  • Visible discoloration, charring, or melting on the relay housing or terminals
Engineering Tips
  • Install snubber circuits or surge suppressors across relay coils and contacts to protect against voltage transients and reduce arcing
  • Implement regular contact resistance testing and cleaning to prevent oxidation buildup, and ensure proper load derating for inductive/capacitive applications

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 61810-1:2015 - Electromechanical elementary relays CE Marking - EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU

Quoted from the published standard.

Manufacturing Precision
  • Contact Resistance: +/- 10% of rated value
  • Terminal Pin Alignment: +/- 0.5mm from nominal position
Quality Inspection
  • Dielectric Strength Test (Hi-Pot Test) - Insulation resistance verification
  • Operational Life Test - Contact endurance under rated load cycles
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
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Supplier transparency
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Manufacturers of Relay Board

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Xiamen Maxwell Automation Limited
Fujian, CN
Founded 2011
CE
Also makes: PID Temperature Controller, Signal Processor, Temperature Controller and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “IO relay board”
View source page ↗ maxwell-fa.com · recorded 2026-08-22
View profile Send enquiry
PCBWay
Shenzhen, Guangdong, CN
Also makes: Printed Circuit Boards, Rf Pcb, Heavy Copper PCB and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Relay Board DPST Assembly”
View source page ↗ pcbway.com · recorded 2026-09-02
View profile Send enquiry

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Frequently Asked Questions

What is the typical number of relay channels on this board?

The board is available with 4 to 32 relay output channels, depending on the specific model. Confirm the exact channel count with the manufacturer for your application.

What are the maximum switching voltage and current?

The relays can switch voltages from 24 to 240 V AC/DC and currents from 2 to 10 A per contact. These are reference ranges; verify the exact ratings for the specific relay board model.

What is the operating temperature range?

The board is designed to operate reliably in ambient temperatures from -40 to 85 °C. Storage temperature range is -40 to 100 °C. Ensure your installation environment stays within these limits.

What standards apply to the board material and ingress protection?

The PCB material is FR-4 per IPC-4101, and copper thickness follows IPC-6012. Ingress protection ranges from IP20 to IP65 per IEC 60529, depending on the enclosure. These standards are references; verify compliance with the manufacturer.

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

Related equipment

Applied To / Applications

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

Backwash Control Module
View system integration details

Industrial Ecosystem & Supply Chain Structure

Specialized Tooling

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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 13 October 2026

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