6ES7921-5CK20-0AA0

Product Description

Home > Products > Siemens > SIMATIC S7-1500 > Connectors Need Siemens 6ES7921-5CK20-0AA0? Front Connector for SIMATIC S7-1500. Supplied with full traceability and documentation. Request a quote and current... Price & Availability It is used to connect sensors and actuators to S7-1500 digital and analog signal modules (SM) that feature 40-pin front connectors. This connector ensures reliable and secure wiring in industrial control cabinets, offering a robust mechanical design that meets the high demands of industrial environments. The connector supports wire cross-sections from 0.25 mm² to 1.5 mm² (AWG 24 to AWG 16) and is rated for a nominal voltage of 24 V DC (typical for S7-1500 signal modules). It features integrated strain relief and a locking mechanism to prevent accidental disconnection. The screw-type terminals provide a gas-tight connection, ensuring long-term stability and low contact resistance. This front connector is part of the Siemens SIMATIC S7-1500 system, which is known for its high performance, modularity, and ease of engineering. The 6ES7921-5CK20-0AA0 is a genuine Siemens spare part, ensuring full compatibility and compliance with original specifications. It is commonly used in new installations as well as for replacement or maintenance of existing S7-1500 I/O modules. The Siemens 6ES7921-5CK20-0AA0 is a SIMATIC S7-1500 front connector with 40 pins, designed for screw-type termination. Basic Product Information Screw-type termination for reliable wiring Supports wire cross-sections from 0.25 mm² to 1.5 mm² (AWG 24 to AWG 16) Integrated strain relief and locking mechanism Rated for 24 V DC nominal voltage Genuine Siemens OEM part 40-pin front connector for S7-1500 signal modules Technical Specifications Version & Model Difference The 6ES7921-5CK20-0AA0 is the current version of the 40-pin screw-type front connector for S7-1500. Earlier versions (e.g., 6ES7921-5CK00-0AA0) may have been used for older S7-300 systems, but this specific model is exclusively for S7-1500. There are also spring-type (cage clamp) versions (e.g., 6ES7921-5CK20-0AB0) that offer faster wiring without tools. The screw-type version is preferred in applications with high vibration or where maintenance is infrequent. Application Scenarios Can this connector be used with S7-300 modules? No, the 6ES7921-5CK20-0AA0 is specifically designed for SIMATIC S7-1500 signal modules. S7-300 modules use a different connector type (e.g., 6ES7921-3... series). Always verify the pin count and connector type before use. What is the maximum wire size that can be used with this connector? The connector supports wire cross-sections from 0.25 mm² to 1.5 mm² (AWG 24 to AWG 16). For stranded wires, ferrules are recommended for reliable connection. Is this connector suitable for use in hazardous areas? The standard 6ES7921-5CK20-0AA0 is not certified for explosive atmospheres. For Ex-rated applications, you must use the Ex-i version (6ES7921-5CK20-0AA6) which has intrinsic safety certification. Always check the module's approval before installation. What is the difference between the 6ES7921-5CK20-0AA0 and the 6ES7921-5CK20-0AB0? The 6ES7921-5CK20-0AA0 uses screw-type terminals, while the 6ES7921-5CK20-0AB0 uses spring-type (cage clamp) terminals. Screw-type connections are more resistant to vibration and allow for larger wire sizes, but require a screwdriver for installation. Spring-type connections are faster to wire and require no tools, but are more sensitive to vibration. Siemens 6ES7214-1BH50-0XB0 PLC CPU (Type-1) Siemens 6ES7231-4HF50-0XB0 Analog Input Module Siemens 6ES7231-5PD50-0XB0 Analog RTD Module Siemens 6ES7231-5QF50-0XB0 Analog TC Module (S7-1200) Siemens 6ES7233-4HF50-0XB0 Analog IO Module (SM 1234) Siemens 6ES7216-2BD23-0XB0 PLC CPU (Type-2) Siemens 6ES7223-1BH22-0XA0 PLC IO Module (Type-1) Siemens 6ES7223-5PH50-0XB0 PLC IO Module (Type-2)