The **MA24FAX-R** is a specific model of a small-form-factor electromagnetic relay, commonly used in automotive and industrial control applications. It is part of the MA series, typically manufactured by companies like **Fujitsu** (or formerly Takamisawa). --- ## Technical Specifications The following table summarizes the key electronic characteristics of the MA24FAX-R: | Parameter | Specification | | :--- | :--- | | **Coil Voltage** | 24V DC | | **Contact Arrangement** | 1 Form A (SPST-NO - Single Pole Single Throw, Normally Open) | | **Contact Rating** | 20A to 30A (depending on the specific load type) | | **Coil Resistance** | Approx. 320 $\Omega$ (nominal) | | **Coil Power** | Approx. 1.8W | | **Operating Temperature** | -40°C to +85°C | | **Terminal Type** | PCB Mount / Solder Terminals | --- ## Key Components and Construction ### 1. The Coil (Actuator) The "24" in the part number indicates a **24V DC** nominal operating voltage. When current flows through this copper coil, it creates a magnetic field that moves the internal armature. The "R" suffix often denotes a specific resistor or diode configuration for surge suppression, or a specific ROHS compliance standard. ### 2. Contact Material These relays typically use **Silver Tin Oxide (AgSnO2)**. This material is chosen for its excellent resistance to: * **Material Transfer:** Reducing "pitting" during switching. * **Welding:** Preventing the contacts from sticking together under high inrush currents. ### 3. Housing and Packaging * **Sealing:** The unit is usually "Flux Tight" or "Plastic Sealed," allowing it to withstand wave soldering and cleaning processes on a PCB. * **Size:** It features a compact "Power Relay" footprint, designed to handle high current despite a small physical volume. --- ## Typical Applications Due to its high current rating and 24V coil, the MA24FAX-R is frequently found in: 1. **Automotive Systems:** Controlling blowers, headlamps, and fuel pumps in 24V vehicle systems (trucks/buses). 2. **Industrial Automation:** Actuating heavy-duty solenoids or motors from a PLC output. 3. **HVAC Systems:** Switching compressors or fans. ---