440N-Z21U26H

Overview of Allen Bradley 440N-Z21U26H

The Allen Bradley 440N-Z21U26H is a non-contact safety switch designed for critical industrial applications that demand reliable machine guarding and access control. Part of the SensaGuard series, this switch features a robust 18mm plastic barrel and is typically used to monitor and secure access points such as safety doors, hatches, and guards. Its solid-state contacts and unique high-level coding ensure integrity in safety systems, helping prevent unauthorized or accidental access to hazardous areas. Suitable for integration into safety-related control systems, the 440N-Z21U26H is engineered to meet stringent standards for shock, vibration, and environmental resistance, making it a dependable choice for demanding automation environments.

Key Features of Allen Bradley 440N-Z21U26H

• 2 normally closed (N.C.) safety contacts and 1 normally open (N.O.) auxiliary contact
• Solid-state electronics for increased reliability and long service life
• Compact 18mm cylindrical barrel design with unique coding
• Plastic housing for lightweight installation and corrosion resistance
• High-level coding option to prevent substitution by unauthorized devices
• Designed for washdown and harsh environments (IP66, IP67, IP69K rated)
• Maximum load current 200 mA, with low voltage drop

Technical Specs of 440N-Z21U26H

• Contact Configuration: 2 N.C. safety, 1 N.O. auxiliary
• Operating Voltage: 24V DC
• Maximum Load Current: 200 mA
• Housing Material: Polycarbonate/plastic
• Operating Temperature: -25°C to +70°C
• Ingress Protection: IP66, IP67, IP69K
• Shock & Vibration: IEC 60068-2-27 (30g, 11ms); IEC 60068-2-6 (10–55 Hz)
• Coding Level: High-level, unique for each unit

Applications / Use Case

The Allen Bradley 440N-Z21U26H is commonly deployed in industrial settings where machine safety is paramount. Typical uses include monitoring the status of safety doors and guards on automated machinery, presses, robots, and conveyor systems. Its non-contact, solid-state design is especially valuable in environments subject to vibration, washdown, or frequent cycling, where mechanical switches may wear out prematurely. By providing a secure, coded interface, this switch helps ensure that safety systems cannot be bypassed or tampered with, supporting compliance with global safety standards. It is suitable for integration into safety control circuits as part of a comprehensive risk reduction strategy, and is not intended for residential use due to potential radio interference.

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