Finder 77.D1.9.024.8650 – 77 Series Modular solid state relays

Why Choose the Finder 77.D1.9.024.8650 Solid State Relay?

The Finder 77.D1.9.024.8650 is a 60 A single-phase solid state relay (SSR) designed for contactless switching of AC electrical loads in industrial automation, process heating and machinery control applications. Part of the Finder Series 77, this relay features a compact hockey puck-style housing suitable for mounting onto a control cabinet surface or appropriately sized heatsink.

Featuring a 3–32 V DC control input and a 24–660 V AC load switching range, the Finder 77.D1.9.024.8650 provides an interface between low-voltage DC control equipment and industrial AC loads. Its single normally open semiconductor output (1 NO / SPST-NO) supports a maximum load current of 60 A, subject to suitable heatsinking, thermal derating and installation conditions.

The relay incorporates zero-cross switching, enabling conduction to begin near the AC voltage zero crossing to help reduce switching disturbances with suitable loads. Its silent, contactless operation, protective screw terminal cover and IP20 degree of protection make it suitable for integration into professionally designed industrial electrical control systems.

Key Advantages

• 60 A maximum load current for appropriately rated single-phase AC loads.
• 24–660 V AC load switching range for industrial electrical applications.
• 3–32 V DC control input for compatible PLC outputs and electronic controllers.
• 24 V DC nominal control voltage for integration into common industrial control systems.
• Zero-cross switching helps reduce electrical switching disturbances with suitable loads.
• Contactless semiconductor operation eliminates mechanical contact bounce.
• Silent switching without mechanical relay operating noise.
• High switching endurance without mechanical contact wear.
• Hockey puck-style housing for panel or heatsink mounting.
• Folding screw terminal cover provides additional protection around electrical connections.
• Input and output terminals on opposite sides for organised control panel wiring.
• Compact 45 mm × 59 mm × 29.4 mm housing for industrial installations.
• IP20 protection rating for installation within suitable electrical enclosures.

Key Features

• Finder Series 77 solid state relay.
• Type 77.D1 single-phase hockey puck-style construction.
• Maximum load current: 60 A.
• Nominal control voltage: 24 V DC.
• Control voltage range: 3–32 V DC.
• Load switching voltage range: 24–660 V AC.
• Output configuration: 1 NO (SPST-NO).
• Number of switched phases: 1.
• Switching method: Zero-cross switching.
• Semiconductor switching technology for contactless operation.
• Panel or heatsink mounting for flexible installation.
• Folding protective screw terminal cover.
• Control and load terminals positioned on opposite sides.
• Operating ambient temperature: −30 °C to +80 °C.
• Housing dimensions: 45 mm × 59 mm × 29.4 mm.
• IP20 degree of protection.
• RoHS-compliant construction.

Reliable 60 A AC Switching for Industrial Heating and Automation

The Finder 77.D1.9.024.8650 provides electronic switching of AC loads using semiconductor technology rather than mechanically operated contacts. Applying a compatible control signal within its 3–32 V DC input range activates the output, allowing PLCs, temperature controllers and other industrial automation equipment to control appropriately rated AC loads.

Its 24–660 V AC switching range supports a variety of industrial electrical applications. The zero-cross switching characteristic is particularly suitable for compatible resistive heating loads, where initiating conduction near the AC voltage zero crossing can help reduce electrical switching disturbances. The absence of moving contacts also eliminates mechanical contact bounce and switching noise.

As a 60 A solid state relay, the Finder 77.D1.9.024.8650 requires careful thermal management. The maximum current rating is dependent on the use of a suitable heatsink and the manufacturer's derating requirements. Ambient temperature, load characteristics, conductor sizing and upstream protective devices must all be considered during installation. Because solid state relays can exhibit off-state leakage current, a separate isolating device is required wherever safe electrical isolation is necessary.

Typical Applications

• Industrial electric heating systems.
• Resistance heating elements and heater banks.
• Industrial ovens and process heating equipment.
• Temperature-controlled manufacturing machinery.
• PLC-controlled AC load switching.
• Industrial automation and electrical control panels.
• Compatible lighting and lamp switching circuits.
• Solenoid and contactor driving applications.
• Packaging and production line equipment.
• Machinery requiring repeated contactless switching.
• OEM machinery and electrical panel manufacturing.
• Industrial applications requiring silent switching from a low-voltage DC control signal.