Relay Board for Backwash Control Module

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

Parameter	Typical range	Notes & selection driver
Number of Channels	4–32	Number of relay outputs on the board.
Switching Voltage	24–240 V AC/DC	Maximum voltage each relay can switch.
Switching Current	2–10 A	Maximum current per relay contact.
Coil Voltage	5–24 V DC	Control voltage for relay coils.
Contact Resistance	≤50 mΩ	Initial contact resistance per relay.
Insulation Resistance	≥100 MΩ	Between coil and contacts at 500 V DC.
Dielectric Strength	1500 V AC	Withstand voltage between coil and contacts for 1 min.
Operating Temperature	-40–85 °C	Ambient temperature range for reliable operation.
Storage Temperature	-40–100 °C	Temperature range for non-operating storage.
Humidity	5–95 % RH	Non-condensing relative humidity range.
Ingress Protection	IP20–IP65	Degree of protection against dust and water.IEC 60529
Board Material	FR-4	Glass epoxy laminate for PCB.IPC-4101
Copper Thickness	35–70 µm	Thickness of copper foil on PCB traces.IPC-6012
Board Dimensions	100×80–300×200 mm	Length × 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

Applied To / Applications

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

Backwash Control Module

View system integration details

Manufacturers of Relay Board

1 company lists 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

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

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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.

Preliminary Technical Classification

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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)

Relay Board

Product Specifications

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