Finder 77.A1.8.230.8650 – 77 Series Modular solid state relays

Why Choose the Finder 77.A1.8.230.8650 Solid State Relay?

The Finder 77.A1.8.230.8650 is a high-performance single-phase solid state relay (SSR) designed for reliable, silent and contactless switching of AC electrical loads in industrial automation and control systems. As part of the Finder Series 77 solid state relay range, it provides a durable semiconductor switching solution for heating equipment, industrial machinery, lighting circuits and automated electrical installations.

Unlike conventional electromechanical relays, this solid state relay uses semiconductor technology to switch electrical loads without moving contacts. Its zero-crossing switching function activates the output close to the AC voltage zero crossing, helping reduce switching interference and electrical stress in suitable applications. The absence of mechanical contacts also eliminates contact bounce and arcing associated with conventional relay operation.

With a rated output current of 25 A, a wide 24–660 V AC load voltage range and a 90–280 V AC control input, the Finder 77.A1.8.230.8650 is suitable for a broad range of industrial switching applications. Its compact hockey-puck housing, relay-style terminal arrangement and panel or heatsink mounting design provide straightforward integration into electrical control cabinets and industrial equipment.

Key Advantages

• Reliable 25 A single-phase solid state relay for industrial AC load switching.
• 24–660 V AC output voltage range supports a wide variety of electrical loads.
• 90–280 V AC control input enables operation from compatible industrial control circuits.
• Zero-crossing switching helps minimise electrical interference when switching suitable AC loads.
• Contactless semiconductor operation provides silent, spark-free and bounce-free switching.
• High switching endurance without mechanical contact wear.
• Compact hockey-puck housing with protective folding screw cover.
• Flexible installation on control cabinet mounting plates or suitable heatsinks.
• IP20 protection rating for installation inside appropriate electrical enclosures.

Key Features

• Finder Series 77 industrial solid state relay.
• 25 A rated output current with appropriate thermal management.
• 24–660 V AC switched load voltage.
• 90–280 V AC control voltage range.
• Single-phase, 1 normally open (SPST-NO) equivalent output.
• Zero-crossing switch-on technology.
• Contactless semiconductor switching for high operational endurance.
• Silent switching without mechanical contact bounce.
• Relay-style input and output terminals positioned on opposite sides of the housing.
• Hockey-puck construction with folding screw terminal cover.
• Screw terminals for secure electrical connections.
• Panel or heatsink mounting for industrial control assemblies.
• −30 to +80 °C ambient operating temperature range, subject to thermal derating.
• Suitable for heating loads, lighting systems, solenoids and contactor control applications.

Reliable Contactless Switching for Industrial Automation

Solid state relays such as the Finder 77.A1.8.230.8650 use electronic semiconductor devices rather than moving mechanical contacts to control electrical loads. When the specified AC control voltage is applied, the relay activates its output switching circuit. Its zero-crossing switching technology delays turn-on until the AC waveform approaches zero voltage, helping reduce switching disturbances in suitable resistive load applications.

The Finder Series 77 is designed for industrial switching systems where quiet operation, high switching endurance and reliable repetitive control are important. The 77.A1.8.230.8650 combines a 25 A output rating with a wide AC load voltage range, making it particularly suitable for electric heating, industrial lighting and other compatible AC loads. Because semiconductor devices generate heat during operation, an appropriately sized heatsink and correct thermal derating are essential. Solid state relays also exhibit off-state leakage current and must not be treated as safety isolation devices; suitable protective and isolation equipment must be provided separately.

Typical Applications

• Industrial electric heating and temperature control systems.
• Resistive heater banks and heating element switching.
• Industrial ovens, furnaces and process heating equipment.
• Packaging and automated production machinery.
• Industrial lighting and compatible lamp switching circuits.
• Solenoid and contactor control applications.
• PLC-controlled industrial automation equipment.
• Electrical control cabinets and switching assemblies.
• OEM machinery requiring silent, repetitive AC load switching.
• Industrial process control and automated electrical installations.