A21ACQ12VDC1.9D

Relay Automotive Overview

The A21ACQ12VDC1.9D 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 with a maximum rated current of 40 Amperes and a maximum switching voltage of 75 Volts DC. The unit utilizes a 12VDC coil with a power consumption of 1.6 Watts and a resistance of 90 Ohms. Constructed with silver tin oxide contacts, it offers robust performance in demanding environments.

Relay Automotive Feature Summary

• High current switching capacity up to 40A
• Sealed construction for environmental protection
• Compact Mini ISO form factor design

Relay Automotive Applications

• Automotive electrical systems
• Lighting accessories control
• General industrial switching

Relay Automotive Procurement Notes

Verify the specific suffix '1.9D' against official CIT documentation to confirm coil characteristics and terminal configuration. Ensure compatibility with existing socket bases and PCB layouts. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process before finalizing procurement orders.

Relay Automotive Selection Notes

Select this component when a compact, sealed relay with 40A capacity is required for 12VDC automotive circuits. The SPST-NO configuration suits simple on/off load control. Consider the physical dimensions and quick-connect or PC-pin mounting options to match the mechanical constraints of the target application board or harness.

Relay Automotive Part Context

This model belongs to the CIT A2 series of automotive relays, characterized by small size and light weight. It is part of a family certified under QS-9000 and ISO-9002 standards, ensuring consistent manufacturing quality for vehicle and lamp accessory applications.

Relay Automotive Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify pinout and coil voltage compatibility if considering alternative manufacturers.