1492-RCDA4A40

Overview of Allen Bradley 1492-RCDA4A40

The Allen Bradley 1492-RCDA4A40 is a 4-pole residual current device engineered to detect and interrupt leakage current to ground in industrial electrical systems. This 40-amp unit provides 30mA sensitivity and operates at a minimum test voltage of 170V, making it suitable for standard North American applications. Part of the Rockwell Automation Bulletin 1492-RCD series, this device mounts directly to standard 35mm DIN rail, simplifying installation in control panels and enclosures. The 1492-RCDA4A40 carries an interrupt rating of 1 kAIC and complies with CCC, CE, and cUL standards. Its compact design allows for integration alongside miniature circuit breakers and other protection modules while maintaining proper spacing and ventilation. The device incorporates Type A detection characteristics, responding to both AC residual currents and pulsating DC residual currents up to 6mA. This dual-detection capability proves critical in modern industrial environments where variable frequency drives and electronic loads generate mixed current types.

Key Features of Allen Bradley 1492-RCDA4A40

• 4-pole configuration with 40A current rating
• 30mA sensitivity for personnel protection
• Type A detection responds to AC and pulsating DC residual currents
• 35mm DIN rail mounting for quick installation
• 1 kAIC interrupt rating
• Standard configuration with 170V minimum test voltage
• CCC, CE, and cUL certified for global compliance

Technical Specs of 1492-RCDA4A40

• Number of Poles: 4-pole
• Current Rating: 40A
• Sensitivity: 30mA
• Interrupt Rating: 1 kAIC
• Minimum Test Voltage: 170V
• Mounting: 35mm DIN Rail
• Standards: CCC, CE, cUL compliant
• Type: Type A (AC and pulsating DC detection)

Applications / Use Case

The 1492-RCDA4A40 residual current device protects personnel and equipment in industrial automation systems where ground fault detection is required. Manufacturing facilities use this device to safeguard operators working with machinery containing electronic drives, motors, and control systems that may develop leakage currents. The 30mA sensitivity threshold provides fast response to dangerous ground faults while minimizing nuisance tripping from normal operational leakage. The 4-pole configuration makes it appropriate for three-phase power distribution with neutral monitoring, common in North American industrial installations running at 480Y/277V or 208Y/120V. Food processing plants, chemical facilities, and water treatment operations benefit from this level of protection where equipment exposure to moisture increases shock risk. Integration with existing Allen Bradley circuit protection components allows system designers to build comprehensive safety architectures. The device pairs effectively with miniature circuit breakers in the same 1492 family, creating layered protection against both overcurrent and ground fault conditions within a single panel footprint.

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