Finder 77.G1.9.024.8250 – 77 Series Modular solid state relays

Why Choose the Finder 77.G1.9.024.8250 Solid State Relay?

The Finder 77.G1.9.024.8250 is a high-performance 100 A single-phase solid state relay (SSR) designed for reliable, silent and efficient switching of AC electrical loads in industrial automation and control systems. As part of the established Finder 77 Series solid state relay range, it provides contactless semiconductor switching for applications requiring frequent operation, long service life and dependable electrical control.

This industrial solid state relay features zero-crossing switching technology, which activates the output close to the AC voltage zero crossing to help minimise electrical interference and switching transients. Unlike conventional electromechanical relays, the Finder 77.G1.9.024.8250 operates without moving contacts, eliminating mechanical contact wear and contact bounce while providing silent, spark-free switching during normal operation.

With a 100 A rated load current, a 24–280 V AC switching voltage range and a 3–32 V DC control input, the Finder 77.G1.9.024.8250 is ideal for industrial heating systems, resistive loads, lighting control and automated electrical equipment. Its compact hockey puck-style housing, screw terminals and panel or heatsink mounting arrangement enable straightforward integration into industrial control cabinets.

Key Advantages

• High-capacity 100 A solid state relay designed for industrial AC load switching.
• 24–280 V AC load voltage range suitable for industrial and commercial electrical applications.
• 3–32 V DC control input compatible with suitable PLC outputs and low-voltage DC control circuits.
• Integrated zero-crossing switching helps reduce electrical noise and switching interference.
• Contactless semiconductor technology eliminates mechanical contact wear and contact bounce.
• Silent operation makes the relay suitable for equipment requiring frequent switching cycles.
• Compact hockey puck-style construction supports panel and heatsink installation.
• Low control power requirements support efficient integration with automation equipment.
• High switching endurance reduces maintenance associated with mechanical relay contacts.
• Suitable for industrial heating, lighting and automated process control applications.

Key Features

• Finder 77 Series industrial solid state relay.
• 100 A rated output current with appropriate thermal management.
• 24–280 V AC switching load voltage.
• 3–32 V DC control voltage.
• Single-phase switching configuration.
• 1 normally open (1 NO) electronic output.
• Zero-crossing switching mode for controlled AC load activation.
• Semiconductor switching without mechanical moving contacts.
• 1500 A maximum peak current for 10 ms.
• 47–400 Hz load operating frequency range.
• −30 to +80 °C ambient operating temperature range.
• Hockey puck-style housing with folding screw cover.
• Screw terminal connections with input and output terminals on opposite sides.
• Designed for mounting on a suitable heatsink or control cabinet mounting surface.

Reliable Solid State Switching for Industrial Automation

Solid state relays such as the Finder 77.G1.9.024.8250 use semiconductor components to switch electrical loads without mechanical contacts. This technology enables rapid, silent and repeatable switching, making solid state relays particularly suitable for industrial equipment operating with frequent switching cycles. The absence of mechanical contact movement eliminates contact bounce and reduces maintenance requirements associated with conventional electromechanical relays.

The Finder 77 Series incorporates zero-crossing switching technology for AC load control. By initiating conduction close to the AC voltage zero crossing, the relay helps limit switching disturbances in suitable applications, particularly resistive heating and lighting systems. The 3–32 V DC control input allows the 77.G1.9.024.8250 to interface with compatible PLC transistor outputs, electronic controllers and low-voltage DC automation circuits.

For dependable high-current operation, the relay must be installed with suitable thermal management. Its 100 A rated load capacity requires appropriate heatsinking and consideration of ambient temperature, load characteristics and manufacturer derating guidance. Correct installation helps maintain reliable semiconductor operation and supports long-term performance in demanding industrial environments.

Typical Applications

• Industrial electric heating and temperature control systems.
• Resistive heater banks and heating elements.
• Industrial ovens, furnaces and drying equipment.
• Packaging and production machinery requiring frequent AC load switching.
• Industrial lighting and lamp control circuits.
• Automated manufacturing and process control equipment.
• PLC-controlled electrical switching systems.
• Electrical control panels and machine automation systems.
• Solenoid and contactor control applications, subject to load compatibility.
• OEM machinery requiring silent, contactless electrical switching.