Solid State Relay Module HFS4-2A-05DM SSR with Resistive Fuse 5V, 2-Channel

Specifications

• Product Type: 2-Channel Solid State Relay Module
• Relay Model: HFS4-2A-05DM
• Number of Channels: 2
• Input Voltage: DC 5V
• Trigger Type: Low-Level Trigger
• Load Type: AC
• Rated Load Current: 2A per channel
• Rated Load Voltage: Up to 250VAC
• Relay Technology: Solid State Relay
• Switching Method: Electronic / Non-Mechanical
• Terminal Type: Screw Terminal
• Protection: Onboard Protection Components / Fuse Arrangement
• Control Application: Microcontrollers, Automation Controllers, Embedded Systems
• Mounting: PCB Mounting Holes
• Operation: Silent Switching
• Contact Type: Solid-State, No Mechanical Contacts

Features

• 2 independent solid-state relay channels
• 5V DC control input
• Low-level trigger operation
• Up to 2A load rating per channel
• 250VAC maximum marked load voltage
• Silent switching with no mechanical relay clicking
• Faster switching than conventional mechanical relays
• Screw-terminal connections for convenient installation
• Compact PCB construction 

Applications 

• Arduino and microcontroller projects
• Raspberry Pi interface projects with appropriate driver circuitry
• AC lighting control
• LED and lamp switching
• Heating element control
• Temperature-control systems
• Small AC fans and compatible motors
• Home automation projects
• Industrial automation prototypes
• Laboratory equipment
• Test and measurement equipment

Package Includes :

• 1 x Solid State Relay Module HFS4-2A-05DM SSR with Resistive Fuse 5V, 2-Channel

Frequently Asked Questions

• What is the HFS4-2A-05DM?
  The HFS4-2A-05DM is a 2-channel solid-state relay module used to control AC loads using a 5V DC control signal.
• How many relays are included on the module?
  The board contains two independent solid-state relay channels.
• What is the input voltage?
  The relay module is designed for a 5V DC input/control voltage.
• Is this module low-level triggered?
  Yes. The module is marked as a low-level trigger type, meaning the control behavior is activated by a low-level control signal.
• What is the maximum load rating?
  The relay is marked 2A at 250VAC. The actual permissible load depends on the load type, switching conditions, wiring, and installation.
• Can it switch AC loads?
  Yes. The module is intended for switching AC loads, with the relay marked for up to 250VAC.
• Can I use it to control a heater?
  It can be suitable for compatible resistive heating loads provided the load remains within the relay's electrical rating and the installation is properly designed.
• Can I control lights with this SSR module?
  Yes. It can be used for compatible AC lighting applications, provided the load current and inrush characteristics remain within the module's capabilities.
• Does the relay make a clicking sound?
  No. Because it uses solid-state switching rather than mechanical relay contacts, it operates without the characteristic clicking sound of a mechanical relay.
• Does an SSR have mechanical contacts?
  No. A solid-state relay uses electronic semiconductor switching rather than mechanical contacts.
• Can I control both channels independently?
  Yes. The two channels are designed to provide independent switching control.
• Is this module suitable for Arduino projects?
  Yes. Its 5V control interface and low-level trigger design make it suitable for many Arduino-based projects, provided the control signal and grounding/wiring arrangement are compatible with the specific controller.
• Can I use it with a Raspberry Pi?
  It may be used in Raspberry Pi projects with suitable interface circuitry. Because Raspberry Pi GPIO operates at 3.3V, verify that the module reliably recognizes the available control signal before connecting it directly.
• Is the module suitable for DC load switching?
  This module is intended for AC load switching. It should not be assumed to be suitable for DC loads unless the specific relay manufacturer's datasheet explicitly confirms a DC load rating.
• Does the module require an external relay driver?
  For a compatible 5V control system, the module is designed to accept the specified control input. However, the electrical compatibility of the controller should always be checked before direct connection.
• Does the module provide electrical isolation?
  Solid-state relay modules commonly use an optically isolated control stage, but the exact isolation construction and rating should be verified against the manufacturer's datasheet for this specific HFS4-2A-05DM version.
• What is the purpose of the onboard protection component?
  The board includes protective components intended to help protect the switching circuit. The exact protection behavior and rating should be confirmed from the manufacturer's technical documentation.