FOTEK SSR-40 DA Solid State Relay Module - 40A DC to AC (Input 3-32VDC, Output 24-380VAC) - Image 1

FOTEK SSR-40 DA Solid State Relay Module - 40A DC to AC (Input 3-32VDC, Output 24-380VAC) - Image 2

FOTEK SSR-40 DA Solid State Relay Module – 40A DC to AC (Input 3-32VDC, Output 24-380VAC)

₨950.00

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Overview

High-performance FOTEK SSR-40 DA Solid State Relay (40A DC to AC) designed for reliable, contactless switching in industrial automation and heating systems. Operating on an input control signal of $3\text{V} - 32\text{V DC}$ , it safely toggles high-voltage AC loads ranging from $24\text{V} - 380\text{V AC}$ without mechanical wear, sparking, or electrical noise. Built with a durable protective casing and an LED status indicator, it is ideal for PID temperature controllers, 3D printer heat beds, oven heaters, and motor control panels.

Key Features:

Contactless High-Speed Switching: Zero mechanical contacts ensure silent operation, long lifespan, and freedom from contact sparking or arcing.
Wide Input & Output Range: Accepts low-voltage DC inputs ( $3\text{V} - 32\text{V DC}$ ) to seamlessly switch standard AC grid loads ( $24\text{V} - 380\text{V AC}$ up to $40\text{A}$ ).
Optocoupler Isolation: Provides complete electrical isolation between low-voltage control signals (microcontrollers/PLCs) and high-voltage AC loads.
Visual Status Indicator: Features an integrated red LED light for real-time monitoring of signal input status.
Easy Mounting: Designed with a flat aluminum baseplate for efficient heat dissipation when mounted on a standard aluminum heatsink.

Detailed Description

FOTEK SSR-40 DA Solid State Relay Module (40A DC to AC)

The FOTEK SSR-40 DA is an industrial-grade Solid State Relay (SSR) designed for reliable, high-speed switching of high-voltage AC loads using low-voltage DC control signals. Capable of handling up to 40A load current, this module operates without mechanical contacts, eliminating common issues found in traditional electromagnetic relays such as contact arcing, mechanical wear, noise, and vibration.

Featuring a wide input control range of 3V to 32V DC and an output load rating of 24V to 380V AC, the SSR-40 DA is an ideal solution for PID temperature controllers, plastic extrusion lines, industrial ovens, 3D printer heated beds, and automated industrial machinery.

Key Features & Technical Highlights

Solid-State Reliability: Built without moving parts, making it immune to mechanical wear, contact bounce, and acoustic noise.
Optocoupler Optical Isolation: Complete isolation between low-voltage microcontrollers/controllers (Arduino, ESP32, PLC) and high-power AC loads ensures system safety and signal integrity.
Zero-Cross Switching: Reduces inrush currents and high-frequency electrical interference by turning on near the zero-voltage point of the AC waveform.
Integrated LED Indicator: Built-in red LED provides real-time visual feedback when the control input signal is active.
Heavy-Duty Construction: Features a flame-retardant ABS housing with a heavy-duty aluminum baseplate for efficient heat dissipation when paired with an external heatsink.

Technical Specifications

Parameter	Specification
Model	SSR-40 DA
Control Mode (Input to Output)	DC to AC (DC Control AC)
Input Control Voltage ( $V_{IN}$ )	$3\text{V} - 32\text{V DC}$
Input Control Current	$3\text{mA} - 25\text{mA}$
Output Load Voltage ( $V_{OUT}$ )	$24\text{V} - 380\text{V AC}$
Max Continuous Load Current ( $I_{LOAD}$	$40\text{A}$ (Requires Heatsink for $>10\text{A}$ )
On-State Voltage Drop	≤ 1.5V AC
Off-State Leakage Current	≤ 3mA
Switching Response Time	≤ 10ms
Dielectric Strength	$2500\text{V AC}$ (1 Minute)
Operating Temperature	-20°C to +80°C
Mounting Type	Panel Mount / Screw Terminals

Terminal Pinout & Connection Guide

Input Control Terminals (DC side)

Terminal 3 (+): Positive Control Input ( $+3\text{V}$ to $+32\text{V DC}$ from microcontroller GPIO, PID controller output, or external source).
Terminal 4 (-): Negative Control / Ground Input (GND).

Output Load Terminals (AC side)

Terminal 1 (~): Connect in series with one side of the AC Power Line (Live/Phase).
Terminal 2 (~): Connect to the AC Load (Heater, Motor, Element) line terminal.

Thermal Management Guidelines

Loads under 10A: Can operate standalone in open air for short durations.
Loads above 10A: Must be mounted on an aluminum heatsink to prevent thermal shutdown or permanent internal damage.
Loads above 20A: Use an aluminum heatsink with thermal grease/paste between the baseplate and heatsink, along with a dedicated cooling fan for heavy continuous cycles.

Recommended Applications

Temperature Control Systems: PID controllers, plastic injection molding, industrial ovens, and heat-sealing machines.
3D Printing & CNC: High-power AC heated bed switching and spindle speed control interfaces.
Lighting & Heating Controls: Commercial HVAC duct heaters, stage lighting arrays, and incubation chambers.
Industrial Automation: PLC output isolation and solid-state motor driving.