SSR-25DD Solid State Relay 25A DC to DC

The SSR-25DD is a single-phase DC-controlled DC solid state relay that uses a small 3-32VDC signal to switch DC loads up to 25A, with no mechanical contacts. It is a natural fit for hobbyists who need to switch DC fans, heater elements, LED strips, pumps, and motors from a microcontroller, PLC, or PID temperature controller output without the clicking, wear, and arcing of a mechanical relay.

The optically isolated input keeps your control circuit separate from the load side, and switching is silent and fast, which suits frequent on/off cycling and slow PWM control. The load side handles 5-60VDC, so it works with 12V, 24V, and 48V systems such as battery-powered projects, 3D printer heated beds, and DIY power controllers.

Four screw terminals and a status LED make wiring and troubleshooting simple, and bolt-down mounting lets you fix it to a heat sink for higher current loads. Observe polarity on the output terminals, use a flyback diode across inductive DC loads, and choose a heat sink suited to your load current.

Specification:

• Model : SSR-25DD
• Control Type : DC to DC
• Input Voltage : 3-32VDC
• Load Voltage : 5-60VDC
• Load Current : 25A
• Turn-On / Turn-Off Time : 10ms Max
• Off-State Leakage Current : 2mA Max
• Terminals : 4 Screw Terminals
• Mounting : Bolt Fixing
• Indicator : LED