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Coaxial relays are critical components in radio frequency (RF) systems, ensuring signal integrity and efficient switching. Selecting the appropriate relay is paramount for reliable performance in applications ranging from amateur radio to professional test equipment. Understanding key specifications will help you make an informed decision for your specific needs.
Widely used on the automotive, oversize vehicles and other large vehicles for starting, also could use on high-current current control system of large variety.
This product is a car start relay used for control battery ON/OFF .
The relay is normally open, and 4-pin relay type, and rated current is 200A, rated voltage is 12VDC.
It features great stable working performance, and great dust proof function .
[DC-18GHz High Frequency Logic] Designed as an industrial replacement RF coaxial switch, utilizing an internal mechanical matrix to manage signal routing from DC to 18GHz limits.
[Technical Blueprint Alignment] Precision-manufactured to match specified SPDT18G12VT indicators, ensuring a balanced fit on standard test fixture backplates.
[3 SMA Female Port Channels] Configured with three standardized technical threaded SMA female connectors below to achieve immediate physical coupling with coax cables.
[12VDC Low Voltage Terminals] Features top-side integrated molded electrical solder pins driven by a 12V direct current voltage loop to alter terminal path alignments.
♥【What You Get】Each package With 2 mini bag of thermal grease which apply on the back of the SSR to make the temperature dissipate faster.
♥ Product Name: solid state module relay SSR-25DD, 3-32VDC/5-220VDC ; Current & Frequency:25A,50/60Hz.
♥ Total size (approximate):58 x 45 x 32mm/2.3" x 1.8" x 1.26" (l*w*t); Net weight:116g; Material:metal, plastic, electronic parts.
♥ SSR Application: with a switch no spark, no noise,high switching speed,anti-corrosion,moisture-proof,anti-vibration,long life.high reliability,electromagnetic compatibility and other characteristics.
Last update on 2026-10-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Coaxial Relays
Understanding Key Specifications
Choosing a coaxial relay involves evaluating several technical parameters. Frequency Range is crucial; ensure the relay operates effectively at your intended frequencies, often measured in MHz or GHz. Impedance should match your system, typically 50 or 75 ohms, to minimize signal reflections and loss. Isolation (or crosstalk) indicates how well the relay prevents signals from leaking between ports when switched, important for maintaining signal purity. Insertion Loss refers to the signal power lost as it passes through the relay, and lower is always better.
Types of Coaxial Relays
Coaxial relays come in various forms, each suited for different applications. SPDT (Single Pole, Double Throw) relays are common, allowing a single input to be switched to one of two outputs. SP4T (Single Pole, Four Throw) and higher configurations offer more switching options. Latching relays maintain their last position without continuous power, saving energy, while non-latching relays return to a default state when power is removed. Consider the switching speed and power handling capabilities required for your setup.
Durability and Environmental Factors
Beyond electrical performance, the physical construction and operational environment are important. Look for relays with robust housing materials that can withstand vibration and shock if your application demands it. Consider the operating temperature range and humidity ratings if the relay will be used in challenging conditions. The lifespan, often rated in switching cycles, should also align with your expected usage to ensure long-term reliability.
Frequently Asked Questions
What is the difference between latching and non-latching coaxial relays?
Latching relays hold their position even after power is removed, making them energy-efficient for static switching. Non-latching relays revert to their default state when power is cut, requiring continuous power to maintain a specific connection.
Why is impedance matching important for coaxial relays?
Impedance matching, typically to 50 or 75 ohms in RF systems, is vital to prevent signal reflections. Mismatched impedance can lead to signal loss and degradation, affecting overall system performance.
What does 'insertion loss' mean in the context of coaxial relays?
Insertion loss is the amount of signal power that is lost when the signal passes through the relay's contacts. Lower insertion loss is desirable as it means less signal degradation and more signal strength reaching the intended destination.
How does isolation affect a coaxial relay's performance?
Isolation, also known as crosstalk, measures how effectively the relay prevents unwanted signal leakage between unconnected ports. High isolation is crucial for applications where signal purity is critical, preventing interference between different signal paths.
What frequency range should I look for?
The required frequency range depends entirely on your application. Ensure the relay's specified operating frequency range encompasses the highest frequency you intend to use to guarantee optimal performance and minimal signal attenuation.
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