A21ASQ12VDC1.9

Relay Automotive Overview

The A21ASQ12VDC1.9 is an automotive SPST-NO relay from the CIT Relay and Switch A2 series, rated for 40A at a maximum switching voltage of 75VDC. It features a 12VDC coil with a power consumption of 1.9W and a resistance of approximately 71.6 Ohms. The unit utilizes quick-connect terminals (0.250 inch) and is fully sealed for environmental protection. Designed for socket mounting, it operates within a temperature range of -40°C to 125°C and employs AgSnO contact material.

Relay Automotive Feature Summary

• High current switching capacity up to 40A
• Fully sealed construction for environmental durability
• Compact design with lightweight form factor

Relay Automotive Applications

• Automotive electrical systems
• Industrial switching applications
• High-current load control circuits

Relay Automotive Procurement Notes

Verify the specific suffix '1.9' against manufacturer catalogs to confirm coil power rating and terminal configuration. Ensure compatibility with existing socket bases and wiring harnesses. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process before finalizing procurement.

Relay Automotive Selection Notes

Select this model for applications requiring high current handling in compact spaces. The 12VDC coil voltage suits standard automotive and industrial control systems. Consider the sealed design for harsh environments and verify that the SPST-NO contact form aligns with the required circuit logic and load characteristics.

Relay Automotive Part Context

This component belongs to the CIT Relay and Switch A2 series, which offers various configurations for automotive and general-purpose use. The A21ASQ variant specifically denotes a sealed, socket-mountable relay with quick-connect terminals, distinguishing it from PCB-mount or flange-mount alternatives within the broader product line.

Relay Automotive Replacement Considerations

Direct substitutes may include variants with different coil powers such as A21ASQ12VDC1.6 or A21ASQ12VDC1.9R, provided the coil voltage and current ratings remain compatible. Verify mechanical dimensions and terminal styles to ensure interchangeability without modifying the host board or socket.