A21ASP24VDC1.9D

Relay Automotive Overview

The A21ASP24VDC1.9D is a sealed, non-latching electromechanical relay manufactured by CIT Relay and Switch. It features a 24VDC coil with a typical current draw of 79.2 mA and a must-release voltage of 2.4 VDC. The unit utilizes a single-pole single-throw normally open (SPST-NO) contact configuration rated for up to 40A at a maximum switching voltage of 75VDC. Mechanical performance includes an operate time of 7 ms and a release time of 5 ms. The component supports both PCB pin and quick connect mounting options.

Relay Automotive Feature Summary

• Sealed construction with integrated resistor
• High current switching capacity up to 40A
• Compact physical design with lightweight form factor
• Dual mounting versatility including PCB pins and quick connects

Relay Automotive Applications

• Automotive electrical systems
• Industrial control panels
• Power distribution units

Relay Automotive Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct coil voltage and contact configuration. Confirm that the sealed variant with the integrated resistor matches the circuit requirements. Cross-reference the package style to distinguish between PCB pin and quick connect terminal types before finalizing procurement orders.

Relay Automotive Selection Notes

Select this component when high current handling up to 40A is required in a compact footprint. Ensure the 24VDC coil voltage aligns with the available control supply. Verify that the SPST-NO contact form meets the logic requirements. Consider the mechanical operating times if fast switching speeds are critical for the application timing constraints.

Relay Automotive Part Context

This part belongs to the CIT A21 series of automotive-grade relays designed for robust performance in demanding environments. The series offers various coil voltages and contact configurations to suit different power switching needs. The A21ASP24VDC1.9D specifically addresses applications requiring reliable high-current switching with a standard 24VDC control signal.

Relay Automotive Replacement Considerations

Direct substitutes include the A21ASP24VDC1.9R and A21ASP24VDC1.9 variants from the same manufacturer family. These parts share identical electrical ratings and form factors but may differ in minor packaging or accessory details. Always verify datasheet specifications before swapping components.