Relay Output Board for Humidity Control Systems

Product Specifications

Technical details and manufacturing context for Relay Output Board

Definition

The Relay Output Board is a critical component within the Humidity Control Module. It receives low-power control signals from the system's processor and uses electromechanical or solid-state relays to switch higher-power circuits. This enables the module to activate or deactivate external devices such as humidifiers, dehumidifiers, fans, or alarms based on humidity sensor readings and programmed setpoints. The board is designed for reliable operation in industrial environments, with a typical configuration of 4 to 8 relay channels. Each relay contact can switch AC voltages up to 250 V and currents in the range of 5 to 10 A, depending on the model. The control signal voltage for relay coil activation is typically 24 V DC with a tolerance of ±10%. The board operates within an ambient temperature range of -40 to 85 °C and a non-condensing relative humidity range of 0 to 95% RH. It offers ingress protection ratings from IP54 to IP65, as per IEC 60529, indicating protection against dust and water jets. The contact material is silver tin oxide (AgSnO2) for high switching endurance. The board substrate is flame-retardant glass epoxy (FR-4) conforming to IEC 61249. Typical dimensions are 100×80×20 mm, and weight ranges from 150 to 200 g, depending on the number of channels and components. The board includes protection components such as flyback diodes, fuses, and surge suppressors to ensure reliable operation. For specific applications, it is essential to verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The board receives digital control signals from the main controller via communication interfaces, typically 5-24 V DC. These signals energize the relay coils, causing the relay contacts to close or open. This creates or breaks electrical connections to external AC or DC loads, allowing the humidity control system to physically operate connected equipment. The board typically includes protection components like flyback diodes, fuses, and surge suppressors to ensure reliable operation.

Common Materials

FR-4 PCB substrate, Copper traces, Relay components (electromechanical or solid-state), Electronic components (resistors, capacitors, diodes)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Channels	4–8	Number of relay outputs for controlling external devices.
Switching Voltage	250 V AC	Maximum AC voltage per relay contact.
Switching Current	5–10 A	Maximum current per relay contact.
Control Signal Voltage	24 ±10% V DC	Input voltage for relay coil activation.
Operating Temperature	-40–85 °C	Ambient temperature range for reliable operation.
Humidity Range	0–95 % RH	Non-condensing relative humidity.
Ingress Protection	IP54–IP65	Protection against dust and water jets.IEC 60529
Contact Material	AgSnO2	Silver tin oxide for high switching endurance.
Board Material	FR-4	Flame-retardant glass epoxy.IEC 61249
Dimensions	100×80×20 mm	Typical board size; custom sizes available.
Weight	150–200 g	Depends on number of channels and components.

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 mounting surface and electrical connections for all components

Material: FR-4 fiberglass
Relays
Electromechanical or solid-state switches that open/close circuits to control external devices

Material: Various (copper contacts, plastic housing, semiconductor materials)
Terminal Blocks
Provide secure connection points for input control signals and output load wiring

Material: Plastic with metal contacts
Driver Circuitry Part
Amplifies control signals to provide sufficient current to activate relay coils

Material: Semiconductor components (transistors, ICs)
Protection Components Part
Protect against voltage spikes, surges, and overload conditions

Material: Diodes, fuses, varistors, optocouplers

Applied To / Applications

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

Humidity Control Module

View system integration details

Manufacturers of Relay Output Board

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Frequently Asked Questions

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

The typical number of relay channels is 4 to 8, depending on the specific model. Always confirm the exact channel count with the manufacturer for your application.

What are the maximum switching voltage and current per relay contact?

The maximum switching voltage is 250 V AC, and the maximum switching current is 5 to 10 A per contact. These values are reference ranges; verify the exact ratings for the specific model.

What is the control signal voltage required to activate the relays?

The control signal voltage for relay coil activation is typically 24 V DC with a tolerance of ±10%. Ensure your controller provides a compatible signal.

What environmental conditions can this board operate in?

The board operates in an ambient temperature range of -40 to 85 °C and a non-condensing relative humidity range of 0 to 95% RH. It has an ingress protection rating of IP54 to IP65, but verify the specific rating for your model.

Data Basis

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

Preliminary Technical Classification

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current:	10A max per relay, 30A total board current
voltage:	5V DC to 24V DC control voltage, 250V AC/30V DC max switching voltage
humidity:	5% to 95% RH non-condensing
temperature:	0°C to 70°C (operating), -40°C to 85°C (storage)

Relay Output Board

Product Specifications

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