A21ACQ24VDC1.9R

Relay Automotive Overview

The A21ACQ24VDC1.9R is an 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 with a rated capacity of 40 Amperes. The coil operates at 24 Volts DC. This component utilizes a socketable design, allowing for easy installation and replacement within vehicle electrical systems. Its compact form factor ensures efficient space utilization in modern automotive architectures while maintaining reliable performance under demanding conditions.

Relay Automotive Feature Summary

• High current switching capability up to 40A for robust load handling
• Socketable construction facilitates straightforward PCB integration and maintenance
• Compact physical dimensions reduce overall system footprint

Relay Automotive Applications

• Automotive lighting circuits
• Vehicle accessory power distribution
• Motor control interfaces

Relay Automotive Procurement Notes

Verify the specific suffix '1.9R' against official CIT Relay and Switch documentation to ensure correct pinout and mounting compatibility. Confirm that the required 24VDC coil voltage aligns with the target vehicle's electrical system specifications. Ensure the socketing interface matches the intended PCB layout or relay base hardware before finalizing procurement orders.

Relay Automotive Selection Notes

Select this model when a high-current SPST switch is required in automotive environments. The 40A rating supports heavy loads such as lights or motors. Verify that the 24VDC coil requirement matches the available control signal. The socketable design is preferred for serviceability. Ensure the operating temperature range meets the specific installation environment constraints.

Relay Automotive Part Context

This component belongs to the A21 series of automotive relays from CIT Relay and Switch. The series is characterized by small size and light weight, suitable for space-constrained vehicle applications. The A21ACQ24VDC1.9R specifically denotes the SPST-NO variant with a 24VDC coil and specific terminal configuration defined by the suffix.

Relay Automotive Replacement Considerations

Compatible substitutes include other automotive relays with matching 24VDC coil voltage, SPST-NO contact configuration, and equal or higher current ratings. Ensure mechanical dimensions and socket compatibility are identical to maintain existing PCB or harness designs without modification.