The **MH24FAD-R** is an electronic component primarily classified as a **low-profile power relay**, typically manufactured by companies like **Fujitsu** (often part of their FTR-H1 or FTR-H3 equivalent series). These relays are designed for PCB mounting and are commonly used in home appliances and industrial controllers. --- ### 1. Technical Specifications Below are the primary electrical and mechanical characteristics of the MH24FAD-R: | Feature | Specification | | :--- | :--- | | **Coil Voltage** | 24V DC | | **Contact Form** | 1 Form A (SPST-NO - Single Pole Single Throw, Normally Open) | | **Contact Rating** | 10A to 16A (depending on the specific load type) | | **Switching Voltage** | 250V AC / 30V DC (Max) | | **Coil Power** | Approx. 400mW - 530mW | | **Mounting Type** | Through-Hole (PCB) | | **Dielectric Strength** | 5,000V AC (between coil and contacts) | --- ### 2. Key Components & Construction The "MH" series is built with high-reliability materials to handle high-inrush currents: * **Coil (24VDC):** The electromagnetic heart of the relay. When 24V is applied, it creates a magnetic field that pulls the armature. * **Contact Material:** Typically **Silver Tin Oxide (AgSnO2)**. This material is chosen for its excellent resistance to "welding" (sticking) when switching inductive loads or high currents. * **Insulation:** Designed with a high "Creepage" and "Clearance" distance to ensure safety between the low-voltage control side (coil) and the high-voltage load side. --- ### 3. Applications The MH24FAD-R is frequently found in the following environments: 1. **HVAC Systems:** Controlling fans, compressors, or heaters in air conditioning units. 2. **White Goods:** Power switching in washing machines, dishwashers, and microwave ovens. 3. **Industrial Controls:** Acting as an interface between a PLC (Programmable Logic Controller) and a heavy motor or lamp. 4. **Power Strips:** Used in "smart" surge protectors to disconnect power electronically. --- ### 4. Part Number Breakdown (Typical) While naming conventions vary slightly by manufacturer, the code usually breaks down as follows: * **MH:** Series designation (High capacity/Low profile). * **24:** Rated coil voltage (24V). * **F:** Contact material/Construction type (often denoting "Flux proof" or AgSnO2). * **A:** Contact arrangement (Form A - Normally Open). * **D-R:** Variations in sensitivity or RoHS compliance (Lead-free). ---