Finder 077.21 – 77 Series Modular solid state relays- Accessory

Why Choose the Finder 077.21 Heat Sink for Solid State Relays?

The Finder 077.21 is a compact aluminium heat sink designed for use with compatible Finder 77.A1 Series solid state relays (SSRs). Part of the Finder 77 Series accessories range, this passive cooling component helps dissipate heat generated during semiconductor switching, supporting effective thermal management in industrial electrical control systems.

Solid state relays generate heat during operation because their semiconductor switching elements have an inherent voltage drop. The Finder 077.21 heat sink provides an extended cooling surface to transfer heat away from the mounted relay and into the surrounding air. With a specified thermal resistance of 2.1 K/W, it is designed to support suitable single-phase solid state relay installations.

The Finder 077.21 is intended for use with Finder 77.A1 hockey-puck-style solid state relays and can be paired with compatible Finder 077.T1 or 077.T2 thermal interface pads. Its compact finned construction makes it suitable for industrial automation, temperature control and electrical switching applications where reliable heat dissipation is essential.

Key Advantages

• Purpose-designed heat sink for compatible Finder 77.A1 solid state relays.
• 2.1 K/W thermal resistance for effective passive heat dissipation.
• Helps transfer heat away from the solid state relay during operation.
• Supports thermal management in suitable industrial switching applications.
• Passive cooling design without a fan or external power supply.
• Compact finned construction provides an extended heat dissipation surface.
• Compatible with Finder 077.T1 and 077.T2 thermal pads.
• Suitable for single-phase solid state relay installations.
• Supports reliable operation when correctly selected for the relay load and ambient conditions.
• Useful in industrial heating, process control and automation equipment.
• Dedicated Finder accessory simplifies selection of a compatible cooling component.
• Suitable for new equipment installations and replacement of existing heat sinks.

Key Features

• Finder 077.21 solid state relay heat sink.
• Part of the Finder 77 Series accessories range.
• Designed for Finder 77.A1 solid state relays.
• Single-phase SSR cooling application.
• Thermal resistance: 2.1 K/W.
• Passive thermal management using natural air convection.
• Finned aluminium construction.
• Compact profile for suitable electrical equipment assemblies.
• Compatible with Finder 077.T1 thermal interface pad.
• Compatible with Finder 077.T2 adhesive thermal interface pad.
• Designed to provide a thermal path between the relay and surrounding air.
• Helps manage semiconductor heat generated during load switching.
• Does not require an electrical supply.
• No moving parts or integrated cooling fan.
• Requires appropriate mechanical mounting and thermal interface installation.
• Manufacturer part number 077.21.

Effective Thermal Management for Solid State Relay Applications

Solid state relays are widely used in industrial automation because they provide fast, silent switching without the mechanical contact wear associated with conventional electromechanical relays. They are particularly useful in electric heating, temperature regulation and repetitive switching applications. However, semiconductor switching devices generate heat during operation, making correct thermal management an important part of SSR selection and installation.

The Finder 077.21 provides a dedicated passive cooling solution for compatible Finder 77.A1 single-phase solid state relays. Its 2.1 K/W thermal resistance helps installers assess heat dissipation requirements when selecting a suitable cooling arrangement. The actual operating temperature depends on relay power dissipation, load current, ambient temperature, mounting orientation and available airflow.

For effective thermal transfer, the relay should be installed using an appropriate interface material such as the Finder 077.T1 or 077.T2 thermal pad. The complete assembly must be checked against the applicable Finder thermal derating information. The heat sink does not independently increase the relay's electrical rating or remove the need for suitable overcurrent protection.

Typical Applications

• Cooling compatible Finder 77.A1 solid state relays.
• Industrial electric heating control systems.
• Temperature regulation equipment.
• Process heating and thermal automation.
• Single-phase semiconductor switching assemblies.
• Industrial machinery control cabinets.
• Packaging and manufacturing equipment.
• OEM electrical control equipment.
• Automated production systems.
• Electrical panels using hockey-puck-style solid state relays.
• Maintenance and replacement of SSR cooling accessories.
• Industrial automation applications requiring passive thermal management.