The FH28 relay is a high-performance PCB-mounted relay manufactured by Zhejiang Fanhar Electronics Co., Ltd., intended for automotive electronics and automation control systems. This relay features a plastic-sealed construction, possesses a switching capacity of 20A at 14VDC, has compact dimensions of 15.5 x 12.0 x 13.7 mm, weighs approximately 6 grammes, and adheres to RoHS environmental regulations.
Special alloy contact materials are used, and the initial contact resistance is strictly controlled within 100mΩ (test condition 6VDC 1A).
Low contact resistance ensures that signal transmission loss is minimised, especially suitable for precision control systems.
The contact surface is specially treated to effectively inhibit arcing and prolong service life.
Dual rating design: 20A/14V DC and 5A/250V AC.
Maximum switching capacity up to 1250VA/280W to meet most automotive electronics requirements.
Minimum permissible load as low as 5VDC/100mA, adapting to tiny signal switching scenarios.
Initial insulation resistance up to 1000MΩ (500VDC test voltage)
Inter-contact voltage withstanding 750VAC for 1 minute without breakdown
UL Class F insulation class to ensure safety and reliability in high temperature environments.
Fast response time of ≤ 10ms for suction time and ≤ 5ms for release time.
Particularly suitable for modern automotive electronic systems requiring high-frequency switching.
Optimised electromagnetic system design ensures consistent operation
Rugged and reliable mechanical structure
The mechanical design of the product reflects engineering wisdom:
Compact package with dimensions of 15.5 x 12.0 x 13.7mm and weight control of 6g, suitable for space-constrained applications
Excellent vibration resistance, withstanding 980m/s² (10g) shock, adapting to vibration environments such as automobiles
Stable performance in vibration environments, working reliably in the frequency range of 10Hz~55Hz with an amplitude of 1.5mm.
Plastic sealing process effectively prevents flux penetration and enhances the long-term reliability of the product.
FH28 relays show their value in many fields:
Automotive electronic systems, ideal for door lock control, turn signal system, power windows.
In the field of industrial automation, it is suitable for automatic door control, safety interlock device and other key positions.
In the field of household appliances, it provides reliable switching for smart home control and automatic curtain systems.
In the field of instrumentation, it plays an important role as the core component of signal switching module.
Selection points for different application scenarios:
Contact configuration: 1A (normally open) is suitable for simple switching circuits, and 1C (conversion) is suitable for scenarios that require switching functions.
Environmental adaptability: Flux proofed for clean environments, Plastic sealed for corrosive gases.
Voltage matching suggestion: standard coil is suitable for regular voltage, sensitive coil (L type) is more suitable for low voltage application.
Installation precautions: High vibration environments require special attention to fixing methods to ensure reliable connections.
The product has undergone rigorous testing and verification:
Load life test: 100,000 operations under DC14V/20A, over 1 million operations under AC250V/5A.
Environmental adaptability test: -40℃~85℃ temperature cycle, 90%RH hot and humid environment long-term verification
Mechanical reliability test: 55Hz vibration, 10g impact and other harsh conditions verification.
Material durability test: the contact material still maintains good contact characteristics after long-term use.
Precautions in engineering applications:
Strictly follow the dimensional drawings when designing the PCB, paying special attention to the 10.2mm pin spacing.
Layout should be done with sufficient electrical clearance, taking into account the need for heat dissipation to avoid localised overheating.
Avoid exceeding the maximum rated parameters, avoiding mechanical shocks and drops.
Regular maintenance to check the contact condition and keep the working environment clean.
FH28 relays are becoming an important choice for automotive electronics and industrial controls due to their professional performance parameters and reliable quality performance. Through continuous innovation, Zhejiang Fanhar Electronics provides reliable relay solutions to the market.
