FH39 Industrial Relay

The FH39 and FH39S series relays are high-performance industrial relays specifically designed for industrial control applications. Featuring a maximum switching capacity of 20A and available with 1A and 1C contact arrangements, they meet the requirements of various circuit control needs. Compliant with RoHS standards, these environmentally friendly products are suitable for demanding industrial environments.

In modern industrial control systems, the reliability of a relay directly impacts the operational stability of the entire equipment. The FH39 and FH39S series relays are built for this purpose—with a core advantage of up to 20A switching capacity, combined with flexible contact configurations and robust electrical design, they can confidently handle a variety of complex industrial application scenarios.

High Switching Capacity for Demanding Loads

As industrial relays, the FH39 series excels in electrical parameters. They support two rated load specifications: 16A and 20A at 250VAC, with a maximum switching voltage of 277VAC and a maximum switching capacity of 5000VA. This means they can reliably handle motor control, power management, HVAC systems, and more.

The contact material uses AgSnO₂ (silver tin oxide), which ensures good conductivity while providing resistance to welding and arc erosion. This significantly extends the product's service life in frequent switching applications. To meet different safety standards, the FH39 series also offers an option with a 1.5mm contact gap, further enhancing electrical isolation in the open contact state. Regarding contact arrangements, both 1A (SPST-NO) and 1C (SPDT) configurations are available, allowing flexible adaptation to various control logic requirements.

High Withstand Voltage and Multi-Level Protection for System Safety

In high-voltage industrial environments, the insulation performance between the coil and contacts is critical. The FH39 series performs robustly in this area: the dielectric strength between the coil and contacts is up to 4000VAC, while the withstand voltage between open contacts meets the 1000VAC standard, with an optional 2500VAC high-withstand version available. Furthermore, the initial insulation resistance is greater than 1000MΩ (tested at 500VDC), effectively preventing leakage current risks and ensuring overall system safety.

The product's enclosure design also considers the complexity of real-world usage environments. For clean indoor environments, the flux proofed type can be selected. If the equipment will be deployed in industrial sites containing corrosive gases like H₂S, SO₂, NO₂, or significant dust, the plastic sealed type is recommended for better moisture, dust, and contamination resistance.

Multiple Coil Voltage Options for Flexible Adaptation

The FH39 series offers a variety of coil voltage specifications from 5V to 48V DC, all with a unified nominal power of 530mW. Whether it's a low-voltage electronic control module or an industry-standard 24V or 48V control system, a matching model is available. The operate and release voltages for each voltage grade are reasonably designed to ensure reliable pick-up and drop-out even during voltage fluctuations. The operate time is ≤15ms, and the release time is ≤8ms, meeting the response speed requirements of most industrial control applications.

Compact Structure for Easy Installation

In equipment with limited installation space, the physical dimensions of components often become a key selection factor. The FH39 has external dimensions of 28.8 x 12.8 x 25.0 mm, while the FH39S is slightly taller at 28.8 x 12.8 x 26.5 mm. Both feature PCB terminals suitable for automated insertion and production. Their compact design allows for easy installation on space-constrained control boards or within distribution boxes, leaving more room for overall layout.

It's worth mentioning that an optional dedicated relay socket is available for this series. This allows for quick wiring and replacement without soldering, significantly reducing equipment commissioning and maintenance time, lowering on-site maintenance costs, and enhancing usage flexibility.

Durability and Environmental Adaptability

With a mechanical endurance of over 5 million operations and excellent electrical endurance under rated loads, the FH39 series is well-suited for control tasks involving frequent action. The operating temperature range is -40°C to +85°C, covering the vast majority of indoor and outdoor industrial environments. Its adaptability to humidity levels from 5% to 85% ensures stable and reliable performance even in damp conditions.

In terms of mechanical stress resistance, the FH39 series can withstand functional shocks of 98 m/s² and destructive shocks of 980 m/s². It maintains stable performance under vibration conditions (10 Hz to 55 Hz, 1.5mm double amplitude), demonstrating its structural reliability during transportation and operation.

Selection and Usage Recommendations

To fully leverage the performance of the FH39 series relays, several points should be noted during installation and use: First, avoid dropping or subjecting the relay to strong impacts to prevent affecting internal structural precision. Second, select the appropriate enclosure type based on the actual environment; for heavily polluted locations, the plastic sealed type is essential. Finally, when designing the PCB layout, refer to the tolerance requirements in the specification: for external dimensions ≤1mm, the tolerance should be ±0.2mm; for dimensions between 1mm and 5mm, the tolerance is ±0.3mm; for dimensions ≥5mm, the tolerance is ±0.5mm. It is recommended to control the tolerance for the PCB layout itself within ±0.1mm.

Summary

With its 20A high current carrying capacity, 4000VAC high isolation voltage, wide range of coil selections, and compact structural design, the FH39 and FH39S relays stand out as reliable products in the industrial control field, offering both performance and flexibility. Whether used in automation equipment, power systems, or home appliance control modules, they provide stable and safe switching assurance. If you are searching for a cost-effective industrial relay for your next project, the FH39 series is certainly worth considering.