Finder 77.F1.9.024.8650 – 77 Series Modular solid state relays

Why Choose the Finder 77.F1.9.024.8650 Solid State Relay?

The Finder 77.F1.9.024.8650 is an industrial 80 A single-phase solid state relay (SSR) designed for high-current, contactless switching of AC electrical loads. Part of the Finder 77 Series, this relay provides a robust electronic switching solution for industrial heating, process control, automated machinery and electrical control systems.

Featuring a 3–32 V DC control input and a 24–660 V AC load switching range, the Finder 77.F1.9.024.8650 enables compatible low-voltage electronic controllers to operate higher-voltage AC equipment. Its single normally open semiconductor output (SPST-NO) is rated at 80 A when installed with appropriate thermal management, making it suitable for demanding applications requiring frequent switching.

The relay incorporates zero-crossing switching, which initiates conduction near an AC voltage zero crossing to help reduce electrical switching interference. Its hockey-puck-style housing, protective folding screw cover, screw terminals and panel or heat-sink mounting arrangement provide a practical installation format for industrial electrical assemblies.

Key Advantages

• 80 A rated load current for suitably rated single-phase AC applications.
• 3–32 V DC control input for integration with compatible PLCs and electronic controllers.
• 24–660 V AC switching range for a broad selection of industrial AC loads.
• 600 V AC rated output voltage for appropriate electrical installations.
• Zero-crossing switching helps reduce electrical interference during turn-on.
• Contactless semiconductor operation eliminates mechanical contact bounce.
• Silent switching for machinery and equipment requiring frequent operation.
• High switching endurance without mechanical output contact wear.
• 800 A maximum peak current for 10 ms under specified conditions.
• Hockey-puck-style housing with a folding protective screw cover.
• Relay-style terminal arrangement with input and output terminals on opposite sides.
• Panel or heat-sink mounting for flexible installation and thermal management.
• IP20 protection rating for use within suitable electrical enclosures.

Key Features

• Finder 77 Series industrial solid state relay.
• Model: 77.F1.9.024.8650.
• Single-phase AC load switching.
• Output configuration: 1 normally open equivalent (SPST-NO).
• Rated output current: 80 A.
• Rated output voltage: 600 V AC.
• Load switching voltage range: 24–660 V AC.
• Nominal control voltage: 24 V DC.
• Control input voltage range: 3–32 V DC.
• Switching mode: Zero-crossing turn-on.
• Maximum peak current: 800 A for 10 ms.
• Operating frequency range: 47–400 Hz.
• Ambient operating temperature: −30 to +80 °C.
• Hockey-puck-style housing with folding screw cover.
• Relay-style terminal layout with input and output connections on opposite sides.
• Screw terminal connections.
• Mounting: Control cabinet panel or suitable heat sink.
• Protection classification: IP20.
• RoHS-compliant construction.

High-Current Zero-Crossing Switching for Industrial AC Loads

The Finder 77.F1.9.024.8650 uses an electronic semiconductor output rather than conventional mechanical relay contacts. When a suitable 3–32 V DC control signal is applied, the relay initiates conduction near an AC voltage zero crossing, allowing current to flow through the connected load. When the control signal is removed, conduction ceases according to the semiconductor output's operating characteristics.

This zero-crossing switching method is particularly useful for suitable resistive loads, including industrial heating elements, where reduced switching interference and frequent operation are desirable. The relay's 80 A rating requires an appropriately selected heat sink and suitable installation conditions. Load characteristics, ambient temperature, ventilation, wiring and protective devices must be considered during design. As a semiconductor switching device, the relay may exhibit off-state leakage current and must not be used as a substitute for a mechanical isolating switch.

Typical Applications

• Industrial electric heating and temperature control systems.
• High-current resistive heating elements.
• Industrial ovens, furnaces and drying equipment.
• PLC-controlled AC load switching.
• Manufacturing and process automation equipment.
• Industrial lighting control applications.
• Solenoid and contactor driver circuits.
• Packaging and production machinery.
• OEM industrial electrical control assemblies.
• Applications requiring frequent, silent and contactless AC switching.