The part number **NT90RHASAC12VCF0.9** refers to a high-power General Purpose PCB Power Relay, commonly manufactured by companies like **NHG (Ningbo Huaguan)**. Below is a detailed breakdown of the electronic specifications and part number nomenclature. --- ### 1. Part Number Breakdown | Segment | Identification | Description | | :--- | :--- | :--- | | **NT90** | Series Model | T90 type relay (Standard Power Relay) | | **R** | Contact Arrangement | Form C (1 Changeover / SPDT) | | **H** | Sealed Type | Plastic sealed (Wash tight) | | **AS** | Termination | PCB Terminals | | **AC12V** | Coil Voltage | 12 Volts Direct Current (DC) | | **C** | Contact Material | Silver Cadmium Oxide (AgCdO) or similar | | **F** | Insulation System | Class F (155°C) | | **0.9** | Coil Power | 0.9W (High sensitivity/Standard) | --- ### 2. Technical Specifications This relay is designed for switching high-current loads, typically in HVAC or industrial automation. #### Electrical Characteristics * **Contact Rating:** Usually rated for **30A to 40A** at 240VAC/28VDC. * **Coil Voltage:** 12V DC. * **Max Switching Power:** 7200VA / 1120W. * **Dielectric Strength:** 2500V AC (between coil and contacts). #### Mechanical Characteristics * **Mounting:** Through-hole PCB mounting. * **Weight:** Approximately 30-35 grams. * **Durability:** * *Mechanical Life:* 10,000,000 operations. * *Electrical Life:* 100,000 operations (at rated load). --- ### 3. Pin Configuration (SPDT / Form C) The relay features five primary pins: 1. **Coil Pin 1 & 2:** Connected to the 12V DC power source to activate the electromagnet. 2. **Common (COM):** The moving part of the switch. 3. **Normally Closed (NC):** Connected to COM when the relay is off. 4. **Normally Open (NO):** Connected to COM when the relay is energized. --- ### 4. Common Applications * **HVAC Systems:** Controlling compressors or fan motors. * **Automotive:** High-current light switching or heater controls. * **Industrial:** Motor control and power supply sequencing. * **Home Appliances:** Washing machines and microwave ovens.