Xiamen ZhiCheng Automation Technology Co., Ltd
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1. Product Overview & Description
The Euchner CET3-AR-CRA-AH-50-SG represents a highly reliable and robust safety switch designed for critical access guarding applications within demanding industrial automation environments. This specific model belongs to Euchner's renowned CET3 series of modular safety switches, renowned for their versatility and adherence to stringent safety standards. It functions as an interlocking device, typically installed on movable guards like doors, hatches, or flaps. The core purpose is to reliably detect the closed and secured position of the guard, ensuring machine operation only occurs when access is safely prevented, thereby protecting personnel from hazardous movements or energies. Constructed with a durable aluminum housing (denoted by 'AH'), it offers excellent resistance to mechanical stress and environmental factors common in factories. The 'SG' suffix indicates a spring-loaded, self-monitoring head module, a key feature for achieving high Safety Integrity Levels (SIL) as per IEC 62061 or Performance Levels (PL) per ISO 13849-1, often up to PL e or SIL 3.
2. Key Technical Parameters & Specifications
This safety switch is characterized by several critical technical parameters essential for system integration and safety validation. The '50' in the model number signifies the standard actuator engagement depth, crucial for proper installation alignment. It features a spring-loaded, positively-driven plunger mechanism ('SG') providing self-monitoring capabilities; this means the switch continuously checks its own internal function for faults like contact welding or spring failure, significantly enhancing safety integrity. Electrical specifications typically include contacts rated for common control circuit voltages (e.g., 24V DC/230V AC) and sufficient current ratings for safety relay coils or PLC inputs. The robust aluminum housing ('AH') ensures a high degree of protection, usually rated at least IP67, making it resistant to dust ingress and temporary water immersion. The 'AR' actuator type often refers to a specific rod-style actuator, while 'CRA' likely specifies the contact block configuration – commonly featuring redundant, force-guided contacts (NC/NO combinations) vital for achieving the required safety categories.
3. Primary Applications & Intended Use
The CET3-AR-CRA-AH-50-SG switch is primarily deployed wherever safe access control to hazardous machinery zones is mandated by safety regulations (e.g., OSHA, EU Machinery Directive). Its typical applications include securing hinged or sliding access doors on robotic workcells, machine tool enclosures, press brakes, injection molding machines, packaging lines, and automated assembly stations. It ensures that dangerous machine functions (like robot motion, cutting, pressing, or high-voltage areas) cannot be initiated or are immediately halted when the guard door is opened. This prevents operators from reaching into hazardous areas during machine cycles. Its robust aluminum construction and high IP rating make it suitable for harsh industrial environments involving dust, coolants, oils, or washdown conditions found in sectors like automotive manufacturing, metalworking, plastics, and food processing. It integrates seamlessly into safety circuits alongside safety relays, controllers (PLCs), or dedicated safety systems.
4. Distinct Advantages & Product Benefits
Choosing the Euchner CET3-AR-CRA-AH-50-SG offers several significant advantages. Its modular design allows for flexibility; components like the head module ('SG') or contact blocks can often be replaced independently, simplifying maintenance and reducing downtime. The spring-loaded, self-monitoring head ('SG') is a major benefit, enabling the switch to achieve high Safety Integrity Levels (SIL 3) and Performance Levels (PL e), which are often required for safeguarding personnel against serious injury risks. The rugged aluminum housing provides exceptional durability and longevity compared to plastic alternatives, offering superior resistance to impact, vibration, and corrosion. The high ingress protection rating (IP67) ensures reliable operation even in challenging, dirty, or wet environments. Furthermore, Euchner's reputation for quality and global support provides assurance of product reliability and availability of technical expertise or spare parts, contributing to lower total cost of ownership and enhanced machine safety compliance.
5. Core Functionality & Operational Features
The fundamental function of the CET3-AR-CRA-AH-50-SG is to provide a highly reliable, positively-driven interlock signal based on guard position. When the guard (e.g., door) is securely closed, a specifically shaped actuator (rod type, 'AR') engages with the switch's spring-loaded plunger. This action physically drives the internal switching elements ('CRA' contact block) into their safe state – typically opening Normally Closed (NC) safety contacts and potentially closing Normally Open (NO) auxiliary contacts. Crucially, the spring-loaded mechanism ('SG') provides self-monitoring: the spring force ensures positive operation and allows the switch to detect internal faults. If a fault occurs (e.g., welded contacts, broken spring, actuator not fully engaged), the internal diagnostics prevent the NC contacts from closing or cause them to open, sending a stop signal to the machine's safety controller. This force-guided design ensures safe failure modes, making it suitable for Category 3 or 4 safety circuits per EN ISO 13849-1.
| Property | Value |
|---|---|
| Product Type | RFID-Coded Safety Switch with Actuator Holder |
| Model Code | CET3-AR-CRA-AH-50-SG |
| Series | CET3 (Modular Safety Switch System) |
| Safety Standards | ISO 14119, IEC 60947-5-1, ISO 13849-1, EN 62061 |
| Safety Level | PL e (ISO 13849-1), SIL 3 (IEC 61508/62061) |
| Technology | RFID (Radio Frequency Identification) with 128-bit encryption |
| Coding Security | >10<sup>15</sup> unique codes (anti-tampering) |
| Voltage Rating | 24 V DC (±20%) / 230 V AC (50-60 Hz) |
| Contact Configuration | 2 N/O (Normally Open) + 2 N/C (Normally Closed) |
| Rated Current | 6 A (AC-15) / 4 A (DC-13) |
| Protection Rating | IP67 (switch), IP69K (actuator) |
| Operating Temperature | -25°C to +85°C |
| Housing Material | Zinc die-cast (switch), Stainless steel (actuator) |
| Actuator Type | RFID Key Actuator (Tool-free mounting via AH: "Actuator Holder") |
| Connection Type | M12 × 1, 5-pin connector (standard) / Cable gland (PG 9) |
| Electrical Life | 10<sup>7</sup> cycles (at rated load) |
| Mechanical Life | 10<sup>7</sup> cycles |
| Dimensions (W×H×D) | 50 × 70 × 40 mm (switch head) |
| Mounting | M30 × 1.5 mounting thread |
| Force Tolerance | Up to 300 N (actuator extraction force) |
| Environmental Resistance | Resistant to oils, vibrations, EMI/RFI interference |
| Certifications | CE, UL, cULus, TÜV, RoHS, IECEx |
| Special Features | Tool-free actuator replacement, LED status indicator, tamper monitoring |
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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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