The **V23050-A1110-A551** is a high-performance safety relay manufactured by **TE Connectivity (Schrack)**. It belongs to the **SR6 series** and is specifically designed for safety-critical applications requiring "force-guided" or "linked" contacts. --- ### ## Technical Specifications Below is a breakdown of the primary electronic and mechanical characteristics of the V23050-A1110-A551: | Feature | Specification | | :--- | :--- | | **Contact Arrangement** | 6-Pole (3 NO + 3 NC or 4 NO + 2 NC depending on wiring) | | **Nominal Coil Voltage** | 110 VDC | | **Max Switching Voltage** | 400 VAC | | **Rated Current** | 8 A | | **Contact Material** | AgSnO2 (Silver Tin Oxide) + Au (Gold plating) | | **Contact Type** | Force-Guided (Type A) | | **Insulation** | Reinforced insulation between contact sets | | **Mounting Type** | Through-hole (PCB Mount) | --- ### ### Key Electronic Components & Features #### 1. Force-Guided Contacts (Mechanically Linked) The most critical feature of this relay is the **mechanical linkage**. If one contact welds shut due to an overcurrent event, the mechanical link prevents the other contacts from moving. This ensures that the Normally Open (NO) and Normally Closed (NC) contacts can never be closed at the same time, allowing safety circuits to detect a failure. #### 2. The Coil System The `A1110` designation indicates a **110V DC coil**. * **Power Consumption:** Typically around 1.2W. * **Sensitivity:** It is a non-polarized DC coil, meaning it operates when the rated voltage is applied regardless of polarity (unless an external protection diode is added by the user). #### 3. Contact Material (AgSnO2) The use of **Silver Tin Oxide** provides: * High resistance to welding. * Good erosion characteristics under heavy inductive loads. * Long electrical life cycle (typically 100,000 operations at rated load). --- ### ### Typical Applications Due to its high reliability and safety rating (EN 50205), this part is used in: * **Emergency Stop Modules:** Ensuring machines stop when a button is pressed. * **Light Curtains:** Processing signals from optical safety barriers. * **Railway Signaling:** Critical switching in train control systems. * **Elevator Controls:** Monitoring door interlocks and motor braking. --- ### ### Pinout and Footprint The V23050 series uses a standard PCB footprint. Because it has **6 poles**, the pin density is high. Designers must ensure adequate "creepage and clearance" distances on the PCB to maintain the safety isolation ratings of the device (typically 8mm between coil and contacts).