A-B 1753-L28BBBM Central control module

A-B Safety Contactors Overview

A-B (Allen-Bradley) safety contactors are specifically designed contactors for safety-critical applications. They comply with stringent safety standards and feature positively guided contacts, ensuring reliable disconnection of safety circuits even in the event of a fault. These contactors are commonly used to build machine safety circuits that comply with standards such as EN ISO 13849-1.

Product Detailed Description

• Function:

• Used to control power in machine and equipment safety circuits.

• Provides redundant contacts (typically normally closed safety contacts) for monitoring the contactor's status.

• Features positively guided contacts (also known as mechanically linked contacts), ensuring no mechanical independence between the main and auxiliary contacts, thus preventing hazardous conditions.

• Works in conjunction with safety relays, safety PLCs, and other safety controllers to form complete safety systems.

• Features:

• Positively guided contacts comply with IEC 60947-5-1 standards.

• High reliability for safety-critical applications.

• Wide range of rated currents and voltage ratings available.

• Offers various auxiliary contact configurations for signal feedback and diagnostics.

• Modular design for easy installation and expansion.

• Some models feature mirror contacts for enhanced safety.

Product Parameters

As there are numerous models of A-B safety contactors, the following are some general parameters. Always refer to the official datasheet for the specific model:

• Rated Current (Ie):

• Wide range, e.g., 9A, 12A, 18A, 26A, 32A, 40A, 50A, 65A, 80A, etc.

• Rated Voltage (Ue):

• Common voltage ratings include 24V DC, 24V AC, 110V AC, 230V AC, 400V AC, etc.

• Contact Configuration:

• E.g., 3 normally open main contacts and 1 normally closed positively guided auxiliary contact, or more different combinations of safety and auxiliary contacts.

• Positively Guided Contacts:

• Complies with the requirements of IEC 60947-5-1.

• Mechanical Life:

• Typically high, e.g., millions of operating cycles.

• Electrical Life:

• Depends on the load and usage conditions.

• Degree of Protection (IP):

• Common protection ratings such as IP20.

• Terminal Type:

• Screw terminals, etc.

• Standards Compliance:

• E.g., EN ISO 13849-1, IEC 60947-4-1, IEC 60947-5-1.

Product Advantages

• High Safety:

• Positively guided contact design ensures reliable disconnection of safety circuits, complying with stringent safety standards.

• High Reliability:

• Specifically designed for safety-critical applications with high reliability.

• Easy Integration:

• Can be easily integrated with safety controllers and components from A-B and other brands.

• Wide Range of Choices:

• Available in various ratings and contact configurations to meet different application needs.

• Global Certifications:

• Typically holds multiple international safety certifications.

Precautions

• Correct Selection:

• Select the appropriate safety contactor model based on specific safety requirements, load characteristics, and application environment.

• Correct Installation:

• Follow Rockwell Automation's installation guidelines, ensuring correct and reliable wiring.

• Safety Circuit Design:

• Integrate the safety contactor into a safety circuit that complies with relevant safety standards and perform proper safety function validation.

• Regular Inspection and Testing:

• Regularly inspect the mechanical and electrical condition of the contactor and perform functional tests to ensure proper operation.

• Prevent Misuse:

• Ensure the contactor is used only for its intended purpose and avoid operating it beyond its rated parameters.

Product Applications

• Machine Safety Circuits:

• Controlling power to safety devices such as safety gates, guards, and emergency stop buttons.

• Emergency Stop Circuits:

• Reliably cutting off machine power in emergency situations.

• Safety Interlocking:

• Implementing interlocking control between different safety functions.

• Two-Hand Control:

• Used for equipment requiring simultaneous operation by both of the operator's hands to initiate hazardous movement.

• Other Safety-Critical Applications:

• Any motor control and power switching applications requiring compliance with strict safety standards.

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