[Lifetime Warranty] 3PCS Solid State Relay SSR-40DA DC

3PCS SSR-40DA Solid State Relay DC Input AC Output

Key Features

• Package Includes: 3 x SSR-40DA Solid State Relays
• Model: SSR-40DA
• Type: DC to AC Single Phase Solid State Relay (SSR)
• Input Control Voltage: 3-32V DC
• Output Load Voltage: 24-380V AC
• Maximum Load Current: 40A
• Insulation Resistance: 500M Ohm / 500VDC
• Terminals: 4 screw terminals for input and output
• Construction: High impact and shock resistance

Replaces / Cross-Reference Part Numbers

• SSR-40DA
• Fotek SSR-40 DA

Compatibility & Fitment

• Designed for switching high-power AC loads using a low-voltage DC control signal from sources like PLCs, microcontrollers (e.g., Arduino, Raspberry Pi), and other logic circuits.
• Common applications include temperature control systems, industrial automation, motor controls, and lighting control.
• A heat sink is required for loads exceeding 10A to ensure proper heat dissipation and prevent overheating.

When to Replace

• The relay fails to activate the AC load when a DC control voltage is applied.
• The relay remains stuck in the "on" state, powering the AC load even when the DC control signal is removed.
• Intermittent or unreliable switching of the connected load.
• Visible signs of physical damage, charring, or cracking on the relay housing.

Installation Tips

• Disconnect all power before beginning installation.
• Ensure the correct polarity (+/-) is observed for the DC input control terminals.
• Connect the AC output terminals in series with the load you intend to control.
• Mount the relay on a metal surface or a dedicated heat sink, especially for high-current applications.
• Apply a thin layer of thermal paste between the relay's metal baseplate and the heat sink for optimal thermal conductivity.
• Securely tighten all screw terminals to ensure a solid electrical connection.