FH49 0.5A 2A 3A Signal Relay – Compact, Durable, and Versatile
The FH49 0.5A 2A 3A Signal Relay is a high-performance electromagnetic switching component designed for applications that demand precision, reliability, and long service life. Its compact construction and multiple current rating options make it suitable for a wide range of electronic control systems.
Multiple Current Ratings for Flexible Use
This relay supports three practical switching levels: 0.5A at 125VAC, 2A at 30VDC, and a maximum load capacity of up to 3A. This flexibility allows engineers to use the same relay model across different circuit requirements without redesigning the control board.
Contact Configuration and Material
The FH49 features a 2 Form C (DPDT) contact arrangement, which enables two independent switching paths within a single relay housing. The bifurcated contact structure, combined with AgNi + Au plated contact surfaces, ensures stable and consistent performance even when switching very low-level signals — down to 10mV and 10µA. This makes it particularly effective in sensitive measurement and communication circuits.
Space-Saving Physical Design
With dimensions of only 15.0 x 7.5 x 9.4 mm and a weight of approximately 2 grams, the FH49 is optimized for high-density printed circuit board assemblies. It is available in both DIP and SMT termination styles, giving designers the freedom to choose the most suitable mounting method for their production processes.
Long Operational Life
Durability is a core strength of this relay. Under normal operating conditions, the mechanical life reaches up to 10 million operations, while the electrical endurance is rated at 100,000 operations under resistive loads. This long-term reliability reduces maintenance needs and extends the service interval of the end equipment.
High Insulation and Surge Withstand Capability
The FH49 provides excellent electrical isolation between the coil and contact circuits. It offers a surge withstand voltage of 2.5kV (coil to contacts), complying with common industrial safety standards for reinforced insulation. The insulation resistance exceeds 1000MΩ at 500VDC, ensuring minimal leakage current and stable performance in high-impedance circuits.
Wide Operating Temperature Range
Designed to perform in diverse environments, the FH49 operates reliably across a temperature range of -40°C to +85°C. This wide tolerance makes it suitable for outdoor equipment, industrial control cabinets, and automotive-related applications where temperature fluctuations are common.
Available in Multiple Coil Versions
The relay is offered in both monostable and magnetic latching coil configurations. The latching version is particularly advantageous for battery-powered or energy-conscious systems, as it maintains its contact state without continuous coil power, thereby reducing overall energy consumption.
Typical Application Areas
Thanks to its balanced combination of size, switching capacity, and insulation performance, the FH49 is widely used in power protection modules, industrial automation controllers, telecommunications interface circuits, and security monitoring equipment. Its proven track record in these fields confirms its status as a reliable choice for signal-level switching.