A21ASQ12VDC1.9R

Relay Automotive Overview

The A21ASQ12VDC1.9R is a non-latching automotive relay manufactured by CIT Relay and Switch, designed for high-current switching applications. It features a single-pole single-throw normally open (SPST-NO) contact configuration capable of handling up to 40A at 12VDC. The unit operates with a 12VDC coil voltage and draws approximately 158.3mA of coil current. Constructed as a sealed component, it utilizes AgSnO contact material to ensure reliable performance in demanding environments.

Relay Automotive Feature Summary

• Sealed construction for environmental protection
• High switching capacity rated at 40A
• Non-latching coil operation

Relay Automotive Applications

• Automotive electrical systems
• Industrial switching circuits
• Lamp accessory control

Relay Automotive Procurement Notes

Verify the specific ordering suffix against official CIT documentation to confirm exact coil power and contact rating specifications. Ensure compatibility with socketable mounting requirements if PCB pin installation is not utilized. Cross-reference datasheet revisions to confirm active status and manufacturing certifications prior to procurement.

Relay Automotive Selection Notes

Select this model when a sealed SPST-NO relay is required for 12VDC automotive or industrial loads up to 40A. Consider the 158.3mA coil current draw for driver circuit design. Verify that the sealed housing meets the environmental exposure standards of the intended application compared to unsealed alternatives.

Relay Automotive Part Context

This component belongs to the CIT A21 series of automotive relays, characterized by compact dimensions and robust switching capabilities. The series includes variants with different contact arrangements and coil powers, such as the A21CSQ for SPDT configurations. The A21ASQ variant specifically targets standard normally open switching tasks within vehicle architectures.

Relay Automotive Replacement Considerations

Direct substitutes include the A21ASQ12VDC1.6D, which shares the same SPST-NO form factor and 40A rating but differs in coil power specification. Verify mechanical fit and electrical parameters before interchange.