The **SUP-P20H-R** is a high-performance **DIN-rail mountable surge protection device (SPD)**, specifically designed to protect electronic equipment from transient voltage surges, often caused by lightning strikes or industrial switching operations. ### 1. Technical Specifications The following table summarizes the key electronic parameters of the SUP-P20H-R: | Parameter | Value | Description | | :--- | :--- | :--- | | **Nominal Voltage ($U_n$)** | 220V / 380V AC | Standard operating voltage of the circuit. | | **Max. Continuous Operating Voltage ($U_c$)** | 385V / 420V AC | The maximum voltage the device can handle indefinitely. | | **Nominal Discharge Current ($I_n$)** | 10 kA | The peak current the SPD can withstand 15 times (8/20μs wave). | | **Max. Discharge Current ($I_{max}$)** | 20 kA | The absolute peak current capacity (8/20μs wave). | | **Voltage Protection Level ($U_p$)** | $\leq$ 1.8 kV | The maximum voltage "let-through" during a surge. | | **Response Time ($t_a$)** | < 25 ns | How fast the device reacts to a spike. | | **Protection Class** | Type 2 (Class II) | Suitable for sub-distribution boards. | --- ### 2. Internal Electronic Components The SUP-P20H-R functions through a combination of several critical electronic parts: * **Metal Oxide Varistors (MOV):** The heart of the device. These are non-linear resistors that have high resistance under normal voltage but drop to near-zero resistance during a surge, shunting the excess energy to the ground. * **Thermal Disconnector:** A safety mechanism that physically disconnects the MOV from the circuit if it overheats due to repeated surges or end-of-life failure, preventing fire hazards. * **Status Indicator Window:** A mechanical/visual part linked to the thermal disconnector. * **Green:** Normal operation. * **Red:** Failure/Replace module. * **Remote Signaling Contact (The "R" Suffix):** The "R" in the model name indicates the inclusion of a dry contact (floating contact). This allows the device to be wired to a PLC or alarm system to remotely notify maintenance if the module has failed. --- ### 3. Installation & Wiring The device is typically installed in parallel with the load it is protecting. ```mermaid L (Line) ----o---- [SPD] ----o---- Load | | (PE) N (Neutral) --o------|----------o---- Load Earth ``` --- ### 4. Key Applications * **Industrial Automation:** Protecting PLCs and sensitive sensors. * **Telecommunications:** Guarding power supplies for base stations. * **Residential/Commercial:** Main or sub-power distribution panels to protect household electronics and HVAC systems.