3PCS Solid State Relay SSR-40DA DC to AC

Key Features

• Model: SSR-40DA
• Quantity: 3 units
• Control Input: 3-32V DC
• Load Output: 24-380V AC
• Maximum Load Current: 40A
• Switching Mode: Zero-crossing
• Response Time: ≤10ms
• Dielectric Strength: ≥2500VAC
• Indicator: LED status light
• Terminals: Screw-type for secure connections
• Mounting: Panel mount

Replaces / Cross-Reference Part Numbers

• Generic replacement for single-phase solid state relays with a 40A rating.
• Interchangeable with other SSR-40DA models that match the input (3-32V DC) and output (24-380V AC) specifications.
• Can replace Fotek SSR-40 DA and other similarly specified relays.

Compatibility & Fitment

• Suitable for single-phase AC resistive loads like heaters and incandescent lighting.
• Commonly used in industrial automation, HVAC systems, and with PID temperature controllers.
• A heat sink is required for loads exceeding 10A to ensure proper thermal management.

When to Replace

• Relay is stuck in the ON position, powering the load continuously.
• Relay is stuck in the OFF position and does not activate the load with a control signal.
• Intermittent or unreliable switching.
• LED indicator does not function correctly.
• Physical signs of overheating, such as a melted or deformed housing.

Installation Tips

• Disconnect all power before installation.
• Apply a thin layer of thermal paste between the relay's metal base and the heat sink.
• Ensure the heat sink is adequately sized for the intended load to prevent overheating.
• Verify that input and load circuit voltages match the relay's specifications.
• Securely tighten all terminal screws to prevent arcing and ensure a solid electrical connection.