Schneider Electric CA3KN40BD Auxiliary Relay, 24V DC, 4NO Contacts

The Schneider Electric CA3KN40BD is a professional-grade auxiliary relay engineered for precise control circuit switching in industrial and commercial electrical systems. This compact device features a 24V DC coil and is equipped with four normally open (NO) contacts, providing reliable performance for complex automation tasks. Built to withstand demanding operational environments, it adheres to international safety and quality standards, making it a dependable component for modern electrical panels.

Advantages

This auxiliary relay offers exceptional reliability and efficiency due to its robust design and high-quality manufacturing standards. Its compact dimensions allow for space-saving installation in crowded control cabinets, while the 24V DC coil ensures energy-efficient operation. The inclusion of four normally open contacts provides versatility for various switching configurations, and the device's certification to CSA, UL, and IP2x standards guarantees consistent safety and durability during long-term use.

Suitable for

• Industrial automation systems
• Control circuit switching
• Electrical panel integration
• Machine control applications

When it may not be suitable

This relay is designed specifically for control circuit switching and is not intended for direct power switching of high-load motors or heavy-duty industrial equipment. It should not be used in environments that exceed its specified voltage or environmental protection ratings.

Key specifications

• Coil voltage: 24V DC
• Contact configuration: 4 normally open (NO)
• Maximum operational voltage: 690V
• Dimensions: 45 x 57 x 48 mm
• Weight: 225 g
• Certifications: CSA, UL, IP2x

How to use

The relay is designed for standard DIN rail or panel mounting within an electrical enclosure. Ensure the control circuit is de-energized before installation. Connect the 24V DC control signal to the coil terminals and wire the load circuits to the four normally open contacts according to your system schematic. Verify all connections are secure and that the voltage levels match the device specifications before applying power.

What to consider before purchase

• Verify that your control system provides a 24V DC signal.
• Ensure the 4 NO contact configuration meets your specific switching requirements.
• Check available space in your control cabinet against the device dimensions.
• Confirm that the environmental conditions are within the IP2x protection rating.

Usage recommendations

For optimal performance and longevity, ensure the relay is installed in a clean, dry environment and protected from excessive vibration or extreme temperatures. Regularly inspect terminal connections to maintain electrical integrity.