67.23.9.024.4300S Finder Power relay 3 pole 50A DC 24VNO

Why Choose the Finder 67.23.9.024.4300S High Power Relay?

The Finder 67.23.9.024.4300S is a specialist 50 A high-power PCB relay from the Finder Series 67 range, designed for demanding electrical switching applications in photovoltaic inverters, solar energy systems, power generators and industrial power management equipment. Featuring a 24 V DC operating coil, three normally open contacts (3PST-NO) and silver tin oxide (AgSnO2) contact material, this relay provides a robust solution for high-current switching and power conversion equipment.

A distinguishing feature of the 67.23.9.024.4300S is its S-version construction, which Finder specifically recommends for applications requiring 100 A switching when all three contacts are connected in parallel. This is a manufacturer-defined application arrangement, not a 100 A rating for each individual contact. Correct current sharing, PCB layout, conductor sizing and the manufacturer's installation requirements are essential when using the parallel-contact configuration.

The relay also incorporates a contact gap of at least 3 mm, reinforced coil-to-contact insulation and a compact through-hole PCB mounting design. Its 24 V DC coil makes it suitable for integration with industrial electronic control systems, while the Series 67 energy-saving coil design can reduce holding power when operated using Finder's recommended coil-drive method.

Key Advantages

• 50 A nominal contact rating for demanding industrial power switching applications.
• Special S-version design recommended by Finder for 100 A switching with all three contacts connected in parallel.
• 24 V DC operating coil suitable for industrial electronic control circuits.
• 3PST-NO contact arrangement provides three normally open switching paths.
• Silver tin oxide (AgSnO2) contacts offer robust switching performance and resistance to contact welding.
• Contact gap of at least 3 mm supports electrical disconnection requirements in suitable power conversion equipment.
• Reinforced insulation between the operating coil and power contacts.
• High switching voltage capability suitable for appropriately rated industrial and renewable energy applications.
• PCB through-hole mounting enables integration into electronic power assemblies.
• Energy-saving coil operation can reduce holding power when used with a suitable coil-drive circuit.
• Three-pole construction offers flexibility for independent switching or the manufacturer's specified parallel-contact application.
• Finder Series 67 design is developed for high-power electrical switching, including photovoltaic inverter applications.

Key Features

• Finder Series 67 high-power electromagnetic relay.
• Manufacturer part number: 67.23.9.024.4300S.
• 24 V DC nominal coil voltage.
• 3PST-NO (3 Form A) contact configuration.
• Three normally open contacts.
• 50 A nominal contact current for the standard contact configuration.
• S-version recommended for 100 A switching when all three contacts are connected in parallel in accordance with Finder's requirements.
• Silver tin oxide (AgSnO2) contact material.
• Contact gap ≥ 3 mm.
• 690 V AC maximum switching voltage in the Series 67 specification.
• 400 V AC contact switching capability for the standard 50 A configuration.
• 340 Ω nominal coil resistance for the standard 24 V DC coil.
• Approximately 71 mA nominal coil current.
• Approximately 1.7 W nominal coil power consumption.
• Energy-saving holding power as low as 170 mW using the specified coil-drive method.
• 6 kV rated coil-to-contact impulse withstand voltage.
• 4,000 V AC coil-to-contact dielectric strength.
• Through-hole PCB mounting with solder terminals.
• RT II environmental protection.
• Non-latching electromechanical operation.

High-Current Relay Switching for Photovoltaic Inverters and Power Management

The Finder 67.23.9.024.4300S is designed for applications requiring dependable electromechanical switching of substantial electrical currents. When its 24 V DC coil is energised, the relay closes three normally open contact paths. When the coil supply is removed, the contacts open, providing mechanical separation between the connected circuits.

The three-pole normally open configuration can be used for suitable multi-circuit switching applications. However, the defining feature of this particular model is the S-version recommendation for 100 A switching. Finder specifies that this higher-current application requires all three contacts to be connected in parallel. The contacts must not be treated as independently rated 100 A circuits, and the permitted switching duty must be established from the manufacturer's application guidance.

The ≥ 3 mm contact gap is particularly relevant to electrical isolation functions in power conversion equipment. Finder's Series 67 range is developed for applications such as solar photovoltaic inverters, where suitable relay contact separation, switching capacity and insulation characteristics are important. The relay's double-break contact construction provides two interruption points within each switching path.

The AgSnO2 contact material supports robust switching performance, while the reinforced insulation between coil and contacts helps separate the low-voltage control electronics from the switched power circuits. With a 6 kV rated impulse withstand voltage and 4,000 V AC dielectric strength between coil and contacts, the Series 67 insulation system is suited to appropriately designed industrial power equipment.

Another important feature is the energy-saving DC coil design. The standard 24 V DC coil consumes approximately 1.7 W during normal energisation, while Finder specifies the possibility of reducing holding power to approximately 170 mW using the recommended coil-drive arrangement. This can help reduce heat generation in densely populated power electronic assemblies and support operation at higher ambient temperatures when the relevant conditions are satisfied.

Because this is a PCB-mounted 100 A parallel-contact application, circuit design is especially important. Engineers should verify the PCB copper capacity, current distribution, thermal performance, protection devices, switching duty and relay spacing against the latest Finder documentation before incorporating the relay into equipment.

Typical Applications

• Photovoltaic inverters and solar power conversion equipment.
• 100 A parallel-contact switching applications designed to Finder's requirements.
• Solar energy generation and power management systems.
• Industrial power generators and generator control equipment.
• Renewable energy switching and electrical control assemblies.
• Grid-connected power conversion systems.
• High-current PCB-mounted electrical switching equipment.
• Industrial energy management and power distribution control.
• Battery energy storage and power conversion equipment, subject to suitable electrical ratings.
• Industrial automation systems requiring high-power switching.
• OEM power electronics and electrical equipment manufacturing.
• Power management equipment requiring reinforced insulation and substantial contact separation.