A21ACQ12VDC1.9R

Relay Automotive Overview

The A21ACQ12VDC1.9R is an automotive electromechanical 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 40 Amperes at a maximum switching voltage of 75 Volts DC. The unit utilizes a 12VDC coil with a power consumption of 1.9 Watts and a resistance of approximately 71 Ohms. Constructed with silver tin oxide contacts, the relay offers robust performance within an operating temperature range of -40°C to 125°C. It employs quick connect terminals measuring 0.250 inches (6.3mm) for secure electrical interfacing.

Relay Automotive Feature Summary

• High current switching capacity rated at 40 Amperes
• Sealed construction ensuring environmental protection
• Compact Mini ISO form factor design
• Quick connect terminal interface for rapid installation

Relay Automotive Applications

• Automotive lighting circuits
• Vehicle accessory power distribution
• Industrial control systems requiring high current switching

Relay Automotive Procurement Notes

Verify the specific ordering suffix 'R' against the manufacturer's official documentation to confirm terminal style and packaging variations. Ensure compatibility with existing socket types and verify that the 12VDC coil voltage aligns with the target system's electrical architecture before procurement.

Relay Automotive Selection Notes

Select this component when a compact, high-current automotive relay is required for 12VDC systems. The SPST-NO configuration suits simple on/off control loads. Consider the 40A rating for heavy-duty applications and ensure the quick connect termination matches the available harness or PCB layout constraints.

Relay Automotive Part Context

This relay belongs to the A2 series of automotive relays from CIT Relay and Switch, characterized by small size and light weight. The A21ACQ variant specifically denotes a Mini ISO footprint with quick connect terminals. This series is widely utilized in modern vehicle electrical architectures due to its reliability and standardized mounting dimensions.

Relay Automotive Replacement Considerations

Direct substitutes include the A21ACQ12VDC1.6D and A21ACQ12VDC1.9D, which share identical electrical ratings and physical form factors but may differ in coil power specifications or terminal plating. Verify pinout compatibility before substitution.