SSR-40AA Solid State Relay - Pack of 2

Key Features

• Model: SSR-40AA
• Quantity: 2 relays per pack
• Type: Single Phase AC-to-AC Solid State Relay
• Load Current: 40A
• Input Voltage Range: 70-280V AC
• Output Voltage Range: 24-480V AC
• Switching Method: Zero-Crossing
• Features a built-in LED status indicator
• Designed with a metal base plate for thermal management

Replaces / Cross-Reference Part Numbers

• SSR-40AA
• SSR 40AA

Compatibility & Fitment

• General-purpose component for applications requiring AC load switching.
• Commonly used in temperature control systems (PID), industrial automation, heating elements, lighting controls, and other machinery.
• Designed for use with resistive loads.
• Ensure your application's voltage and current requirements fall within this relay's specified operating range.

When to Replace

• The connected load does not turn on when control voltage is applied.
• The connected load remains on permanently, even with no control voltage.
• Operation is intermittent or unreliable.
• Visible signs of overheating, charring, or physical damage to the relay casing.

Installation Tips

• A heat sink is required for loads exceeding 10A to prevent overheating.
• Apply a thin layer of thermal compound between the relay's metal base and the heat sink for optimal heat transfer.
• Ensure all terminal connections are secure to prevent arcing.
• Use appropriately sized wiring to handle the intended load current.
• Verify correct wiring for input (control) and output (load) terminals before applying power.