LED
LCD
Solid State Relay 3V~32V DC to 24V~380V AC SSR-25DA
Product Overview
The SSR-25DA from Pro Tronix represents the modern evolution of the traditional mechanical relay. Unlike mechanical relays, the SSR has no moving parts, which means no contact wear, no clicking noise, and zero risk of electrical sparking. This makes it exceptionally reliable for high-frequency switching applications, such as maintaining precise temperatures in 3D printer heat beds or industrial ovens.
With a control input range of 3V to 32V DC, it can be driven directly by an Arduino, ESP32, or PLC. It can safely manage AC loads up to 25A at voltages between 24V and 380V AC, providing a robust bridge between low-power logic and high-power industrial equipment.
Technical Specifications
| Feature | Specification |
| Model | SSR-25DA |
| Control Input Voltage | 3V – 32V DC |
| Load Output Voltage | 24V – 380V AC |
| Rated Load Current | 25A |
| Switching Type | Zero Cross Trigger |
| On-state Voltage Drop | ≤ 1.6V |
| Response Time | ≤ 10ms |
| Dielectric Strength | 2500V AC |
| Supplier | Pro Tronix |
Key Features
Silent & Reliable: No mechanical movement ensures a silent operation and a significantly longer lifespan than traditional electromagnetic relays.
Optically Isolated: Features internal opto-isolation to protect your sensitive microcontroller from high-voltage AC surges.
LED Status Indicator: Includes a built-in red LED that illuminates when the input signal is active, allowing for easy troubleshooting.
Fast Switching: Capable of high-speed toggling, making it perfect for Pulse Width Modulation (PWM) and PID control loops.
Common Applications
3D Printer Heat Beds: Controlling large silicone heaters or high-power AC heat beds for stable printing temperatures.
Industrial Ovens & Heaters: Used in PID temperature controllers for precise thermal management.
CNC & Motor Control: Safe switching of AC spindles or heavy-duty industrial fans.
Home Automation: Controlling high-wattage appliances like water heaters or AC motors via smart controllers.
Note: For continuous operation at high currents, it is highly recommended to mount the SSR on an aluminum heat sink to ensure proper heat dissipation.
You can see the rest of our available relays from here: Relay | Pro Tronix
