SSR-25AA Solid State Relay

Key Features

• Model: SSR-25AA
• Type: Single-Phase AC-to-AC Solid State Relay
• Control Input Voltage: 80-250V AC
• Load Output Voltage: 24-380V AC
• Maximum Load Current: 25A
• Switching Method: Zero-crossing trigger
• Operation: Silent, no-spark, high-speed switching
• Construction: Features an integrated metal baseplate for heat dissipation
• Dimensions: 5.8 x 4.5 x 2.2 cm

Replaces / Cross-Reference Part Numbers

• SSR-25AA
• SSR-25AA-L

Compatibility & Fitment

• Designed for general purpose AC load switching in industrial automation, process control systems, and machinery.
• Compatible with control circuits providing an 80-250V AC signal.
• Suitable for resistive and inductive AC loads up to 25A within a 24-380V AC voltage range.
• Requires a heat sink (not included) for operation near maximum rated current to prevent thermal damage.

When to Replace

• The connected load circuit remains permanently on or off.
• Relay fails to activate when control voltage is applied.
• Intermittent or unreliable switching performance.
• Visible signs of overheating, melting, or physical damage to the housing.

Installation Tips

• Disconnect all power to the circuit before installation or removal.
• Ensure correct wiring for input (control) and output (load) terminals.
• Apply a thin layer of thermal compound between the relay's metal base and the mounting heat sink.
• Securely fasten the relay to a heat sink appropriately sized for your specific load current.
• Verify that the control signal and load voltage/current are within the specified ratings of the relay.