SD-I-DP-V02 Dual-Contact Mechanical Interlock Switch IP67 Stainless Steel Industrial Guard

1. Product Overview

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The Schmersal SD-I-DP-V02 is a high-performance magnetic safety switch engineered for critical guard door monitoring in industrial automation. Featuring a ​robust zinc die-cast housing (IP67 rated)​, this device provides reliable position detection of hinged or sliding guards while resisting dust, water jets, oils, and mechanical impacts. Its operating principle utilizes a magnetic field interaction between the switch body (mounted on the machine frame) and a separate actuator (mounted on the guard door). The "DP" designation indicates integrated ​dual-channel diagnostics, while "V02" specifies 24V DC operation. When the guard closes, the magnetic actuator maintains safety contacts in the safe position; opening the guard instantly triggers contact transition for immediate machine shutdown. Integrated multicolor LEDs provide clear visual status indication for guard position, diagnostics, and power status.

​2. Key Technical Parameters

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Operating at ​24V DC ±10%​, this switch achieves ​Performance Level PL e (ISO 13849-1 Category 4)​​ and ​Safety Integrity Level SIL 3 (IEC 62061)​. It features dual-channel ​force-guided Normally Closed (NC) contacts​ rated at ​6A/250V AC​ with positive-break operation. The magnetic system provides an ​8mm switching distance​ with high misalignment tolerance (±5mm lateral). Environmental specifications include an ​operating temperature range of -25°C to +70°C​ and ​vibration resistance to 55Hz at 1mm amplitude. Diagnostic monitoring is provided through an auxiliary ​Normally Open (NO) contact​ signaling internal faults. With ​mechanical endurance exceeding 5 million operations, it incorporates an ​M12 connector​ for rapid installation. Safety certifications include ​EN 60947-5-3, ​UL 508, and ​IECEx/ATEX​ for hazardous areas.

​3. Primary Applications and Use Cases

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This safety switch is essential for safeguarding hazardous machinery across industries. In ​robotic workcells, it monitors access doors to prevent entry during automated operations. ​Packaging machinery​ utilizes it to confirm guard closure before initiating high-speed cycles. ​CNC machining centers​ implement it for spindle guard monitoring, while ​plastic injection molding machines​ rely on it for securing mold area access. Additional critical applications include ​press brake safety gates, ​automated assembly line perimeter guards, ​material handling system access points, and ​pharmaceutical cleanroom equipment. Its diagnostic capabilities are particularly valuable in ​automotive paint shops​ where contaminants could compromise conventional switches, while the IP67 rating ensures reliability in ​food processing washdown areas​ and ​foundries​ with metal particulate exposure.

​4. Product Advantages and Functional Benefits

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The SD-I-DP-V02 delivers significant operational advantages through advanced safety engineering. ​Dual-channel diagnostics​ provide early failure warnings, reducing unplanned downtime through predictive maintenance. The ​8mm switching distance​ offers exceptional installation tolerance, accommodating thermal expansion and vibration-induced misalignment. ​Bright multicolor LEDs​ enable instant fault identification from 10m distance, cutting troubleshooting time by 50%. The ​zinc die-cast housing​ withstands 50J impacts (IK10), making it suitable for high-traffic industrial environments. ​Diagnostic coverage exceeding 99%​​ ensures compliance with stringent safety standards while minimizing nuisance trips. The ​M12 connector system​ reduces installation time by 40% compared to hardwired alternatives. ​Extended mechanical life (5M+ cycles)​​ delivers lower total cost of ownership in high-cycle applications.

​5. Core Functionality and Safety Operation

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The SD-I-DP-V02 operates through redundant magnetic reed technology. When the guard closes, the magnetic actuator aligns with the switch body, maintaining both NC safety contacts closed. Simultaneously, the diagnostic circuit monitors contact integrity. Opening the guard moves the actuator beyond 8mm, causing both safety contacts to positively open within 15ms. Crucially, the ​force-guided relay design​ ensures mechanical linkage between contacts - if one contact welds closed, the other cannot open, creating a detectable fault. The auxiliary NO contact changes state during internal faults (e.g., contact welding, voltage irregularity), signaling the safety PLC while maintaining shutdown capability. Safety controllers monitor both safety channels and the diagnostic contact; any discrepancy triggers immediate machine stop and prevents restart until resolution. Manual reset requires physical guard closure and deliberate reset command after fault clearance.

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Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

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