Finder 77.D1.8.230.8650 – 77 Series Modular solid state relays

Why Choose the Finder 77.D1.8.230.8650 Solid State Relay?

The Finder 77.D1.8.230.8650 is a high-capacity 60 A single-phase solid state relay (SSR) designed for reliable, silent and contactless switching of AC electrical loads in industrial automation and process control systems. As part of the Finder Series 77 solid state relay range, it provides a robust semiconductor switching solution for electric heating, industrial machinery, lighting equipment and automated electrical installations.

Unlike conventional electromechanical relays, the Finder 77.D1.8.230.8650 uses semiconductor technology to control electrical loads without moving contacts. Its zero-crossing switching function activates the output close to the zero-voltage point of the AC waveform, helping minimise electrical interference and switching stress in suitable applications. Contactless operation also eliminates mechanical contact bounce and supports high switching endurance in systems requiring frequent or repetitive switching.

Featuring a 60 A rated output current, a wide 24–660 V AC load voltage range and a 90–280 V AC control input, the Finder 77.D1.8.230.8650 is suitable for demanding industrial switching applications. Its compact hockey-puck housing, relay-style terminal arrangement and panel or heatsink mounting design provide convenient integration into electrical control cabinets and industrial equipment.

Key Advantages

• High-capacity 60 A single-phase solid state relay for industrial AC load switching.
• 24–660 V AC switched load voltage range supports a broad range of industrial electrical applications.
• 90–280 V AC control input enables operation from compatible industrial AC control circuits.
• Zero-crossing switching technology helps reduce electrical interference when controlling suitable AC loads.
• Contactless semiconductor operation provides silent, spark-free and bounce-free switching.
• High operational endurance without mechanical contact wear.
• Compact hockey-puck housing with a protective folding screw cover.
• Relay-style terminal arrangement separates input and output connections for convenient wiring.
• Panel or heatsink mounting provides flexible installation options.
• IP20 protection rating supports installation within suitable industrial electrical enclosures.

Key Features

• Finder Series 77 industrial solid state relay.
• 60 A rated output current with appropriate heatsink selection and thermal management.
• 24–660 V AC load switching range.
• 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.
• Low control power compared with many electromechanical switching arrangements.
• Relay-style input and output terminals positioned on opposite sides of the housing.
• Hockey-puck construction with folding screw terminal cover.
• Screw terminal connections for secure electrical wiring.
• Mounting on control cabinet sheet metal or a suitable heatsink.
• IP20 enclosure protection.
• −30 to +80 °C ambient operating temperature range, subject to thermal derating.
• Suitable for heater control, compatible lighting circuits, solenoids and contactor driver applications.

Reliable High-Current Solid State Switching for Industrial Automation

Solid state relays such as the Finder 77.D1.8.230.8650 use semiconductor components rather than moving mechanical contacts to control electrical loads. When the specified 90–280 V AC control signal is applied, the relay activates its AC output switching circuit. Its zero-crossing switching technology delays turn-on until the AC waveform approaches zero voltage, helping reduce switching disturbances when controlling suitable resistive loads. This makes the relay particularly useful in applications requiring frequent switching of electric heating elements and other compatible industrial loads.

The Finder Series 77 is designed for industrial applications where quiet operation, high switching endurance and dependable repetitive control are essential. The 77.D1.8.230.8650 combines a substantial 60 A output rating with a wide AC switching voltage range, providing a practical solution for demanding industrial heating and automation systems. Because semiconductor switching generates heat during operation, an appropriately sized heatsink and correct thermal derating are essential. Solid state relays also exhibit off-state leakage current and do not provide mechanical isolation, so correctly rated protective and isolation devices must be installed separately.

Typical Applications

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