The **HFE6-BS-12-2HT2-R** is a specific part number for a **High-Voltage Latching Relay** manufactured by Hongfa. These relays are primarily designed for high-power switching applications such as smart meters, electric vehicle charging stations, and industrial control systems. --- ### 1. Part Number Breakdown The nomenclature reveals the core electrical and physical characteristics of the component: | Code Segment | Description | Specific Detail | | :--- | :--- | :--- | | **HFE6** | Series Name | High Power Latching Relay Series | | **BS** | Structure/Application | Specialized for specific meter or mounting standards | | **12** | Coil Voltage | 12V DC nominal operating voltage | | **2** | Number of Coils | Dual Coil (Double winding) | | **HT2** | Contact Material/Form | Typically 2 Form A (DPST-NO) or specific silver alloy contacts | | **R** | RoHS Compliance | Environmentally friendly materials | --- ### 2. Key Technical Specifications Based on the HFE6 series standard documentation, here are the typical electronic ratings: #### **Contact Data** * **Contact Capacity:** Typically supports up to **60A to 90A** at 250VAC. * **Contact Resistance:** $\le$ 2.0 m$\Omega$ (Initial). * **Switching Power:** Up to 22,500 VA. * **Mechanical Endurance:** $1 \times 10^6$ cycles. #### **Coil Data (12VDC)** * **Set Voltage:** $\le$ 9.6 VDC. * **Reset Voltage:** $\le$ 9.6 VDC. * **Pulse Duration:** Requires a pulse of $\ge$ 100ms to change state. --- ### 3. Core Electronic Features #### **A. Latching Mechanism** Unlike standard relays, this is a **bistable (latching)** relay. It uses permanent magnets to hold the contacts in place. * **Benefit:** It does not require continuous current to stay "ON" or "OFF." You only apply a short 12V pulse to flip the state. * **Efficiency:** Drastically reduces power consumption and heat dissipation in the control circuit. #### **B. Dual Coil (Type "2")** This part features two separate windings: 1. **Set Coil:** Pulsing this coil closes the contacts. 2. **Reset Coil:** Pulsing this coil opens the contacts. This simplifies the driving circuit compared to single-coil versions, which require reversing the polarity of the pulse. #### **C. High Dielectric Strength** Designed to handle surges, it usually offers a dielectric strength of **4,000VAC** between the coil and the contacts, providing excellent isolation for sensitive control electronics. --- ### 4. Typical Applications * **Smart Energy Meters:** Remote disconnection and reconnection of power. * **Solar Inverters:** Managing the output of PV systems. * **EV Chargers:** High-current switching for Level 2 AC charging stations. * **Industrial Automation:** Load management where power efficiency is critical.