Finder 77.D1.9.024.8250 – 77 Series Modular solid state relays

Why Choose the Finder 77.D1.9.024.8250 Solid State Relay?

The Finder 77.D1.9.024.8250 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. Part of the Finder Series 77 solid state relay range, this industrial switching device provides a durable semiconductor-based alternative to conventional electromechanical relays for electric heating, lighting, machinery and automated electrical installations.

Unlike mechanical relays, the Finder 77.D1.9.024.8250 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 reduce electrical interference and switching stress when controlling suitable loads. Contactless operation also eliminates mechanical contact bounce and supports high switching endurance in applications requiring frequent or repetitive switching.

Featuring a 60 A rated output current, a 24–280 V AC switched load voltage range and a 3–32 V DC control input, the Finder 77.D1.9.024.8250 is particularly suitable for industrial systems requiring low-voltage DC control of high-current AC loads. Its compact hockey-puck housing, relay-style terminal arrangement and panel or heatsink mounting design support straightforward installation within industrial electrical control cabinets.

Key Advantages

• High-capacity 60 A single-phase solid state relay for demanding industrial AC switching applications.
• 3–32 V DC control input suitable for compatible PLC outputs and electronic control circuits.
• 24–280 V AC load voltage range supports a wide variety of industrial electrical loads.
• Zero-crossing switching technology helps minimise electrical interference when switching suitable AC loads.
• Contactless semiconductor operation provides silent, spark-free and bounce-free switching.
• High operational endurance without mechanical contact wear.
• 4,000 V AC input-to-output dielectric strength provides electrical separation between control and load circuits.
• Compact hockey-puck housing with a protective folding screw cover.
• Relay-style terminal arrangement simplifies separation of control and load wiring.
• Flexible panel or heatsink mounting for industrial electrical assemblies.

Key Features

• Finder Series 77 industrial solid state relay.
• 60 A rated output current with appropriate heatsink selection and thermal management.
• 24–280 V AC switched load voltage.
• 3–32 V DC control voltage range.
• 24 V DC nominal control voltage.
• Single-phase, 1 normally open (SPST-NO equivalent) output.
• Zero-crossing switch-on technology for suitable AC load applications.
• Contactless semiconductor switching for high operational endurance.
• Silent operation without mechanical contact bounce.
• Low-power DC control input for industrial 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.
• IP20 protection rating.
• −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.D1.9.024.8250 use semiconductor components rather than 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 makes the relay particularly useful for frequent switching of electric heating elements and other compatible industrial equipment.

The Finder Series 77 is designed for applications where quiet operation, high switching endurance and dependable repetitive control are important. The 77.D1.9.024.8250 combines a substantial 60 A output rating with a wide AC switching voltage range and low-voltage DC control, making it suitable for industrial heating, automation and electrical process control. 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.