Finder 77.G1.9.024.8650 – 77 Series Modular solid state relays

Why Choose the Finder 77.G1.9.024.8650 Solid State Relay?

The Finder 77.G1.9.024.8650 is a high-capacity 100 A single-phase solid state relay (SSR) designed for reliable, silent and contactless switching of AC electrical loads. Part of the Finder Series 77 industrial solid state relay range, this semiconductor switching device is suitable for demanding industrial heating, process control, machinery and automation applications where frequent switching and dependable operation are essential.

Unlike conventional electromechanical relays, the Finder 77.G1.9.024.8650 uses semiconductor technology to switch electrical loads without moving contacts. Its zero-crossing switching function activates the output close to the zero-voltage point of the AC waveform, helping reduce switching interference and electrical stress when controlling suitable AC loads. The absence of mechanical contacts also eliminates contact bounce and mechanical switching noise, making the relay particularly useful for repetitive industrial switching operations.

Featuring a 100 A rated output current, a wide 24–660 V AC switched load voltage range and a 3–32 V DC control input, the Finder 77.G1.9.024.8650 provides high-current AC switching controlled by a low-voltage DC signal. Its compact hockey-puck housing, relay-style terminal arrangement and panel or heatsink mounting construction allow convenient integration into industrial electrical control cabinets and power switching assemblies.

Key Advantages

• High-capacity 100 A single-phase solid state relay for demanding industrial AC load switching.
• 24–660 V AC switching voltage range accommodates a wide variety of industrial electrical loads.
• 3–32 V DC control input supports integration with compatible PLC outputs and electronic control systems.
• Zero-crossing switching technology helps reduce electrical interference during suitable AC load switching.
• Contactless semiconductor operation provides silent, spark-free and bounce-free switching.
• High operational endurance without the mechanical contact wear associated with conventional relays.
• 1,500 A maximum peak current for 10 ms provides a defined short-duration surge capability.
• Compact hockey-puck housing with a protective folding screw cover.
• Relay-style terminal arrangement separates control and load connections for convenient installation.
• Panel or heatsink mounting supports integration into industrial power control assemblies.
• IP20 protection rating for installation within suitable electrical enclosures.

Key Features

• Finder Series 77 industrial solid state relay.
• Type 77.G1 high-current single-phase switching configuration.
• 100 A rated output current with suitable heatsink selection and thermal management.
• 24–660 V AC switched load voltage.
• 3–32 V DC control voltage range.
• 24 V DC nominal control voltage.
• 1 normally open (SPST-NO equivalent) output.
• Zero-crossing switch-on technology.
• High-speed semiconductor switching without moving electrical contacts.
• Silent operation without mechanical contact bounce.
• 1,500 A maximum peak current for 10 ms.
• 47–400 Hz operating frequency range.
• Low-power DC control input for compatible automation systems.
• 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.
• Panel or heatsink mounting for industrial control assemblies.
• −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.G1.9.024.8650 use electronic semiconductor components instead of moving mechanical contacts to control electrical loads. When a compatible 3–32 V DC control signal is applied, the relay activates its AC output switching circuit. Its zero-crossing switching technology delays turn-on until the AC voltage waveform approaches zero, helping reduce switching disturbances when controlling suitable resistive loads. This operating principle makes the relay particularly effective for frequent switching of electric heating elements and other compatible industrial equipment.

The Finder Series 77 is designed for industrial applications requiring quiet operation, high switching endurance and dependable repetitive control. The 77.G1.9.024.8650 combines a substantial 100 A output rating with a wide AC switching voltage range and low-voltage DC control, making it suitable for industrial heating, automated manufacturing and process control 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.