A21CSP12VDC1.9

Relay Automotive Overview

The A21CSP12VDC1.9 is an automotive relay manufactured by CIT Relay and Switch, designed for high-current switching applications in vehicle electrical systems. This specific model features a coil voltage of 12 VDC with a rated power consumption of 1.9 W. The device utilizes a single-pole single-throw normally open (SPST NO) contact arrangement, providing a robust switching capacity suitable for demanding automotive loads. It supports a maximum switching current of 40 A at 14 VDC and handles up to 630 W of switching power. The contacts are constructed from AgSnO2 material to ensure durability and low initial contact resistance below 30 milliohms. The unit operates within a wide temperature range and is certified under QS-9000 and ISO-9002 standards, ensuring reliability for automobile and lamp accessory integration.

Relay Automotive Feature Summary

• High switching capacity supporting up to 40 A for heavy-duty automotive loads
• Compact physical design with lightweight construction for efficient space utilization
• Versatile mounting options including PCB pin and quick connect configurations
• Manufacturing compliance with QS-9000 and ISO-9002 quality certifications

Relay Automotive Applications

• Automotive lighting circuits
• Vehicle accessory power distribution
• Industrial control panels requiring automotive-grade relays
• Lamp accessories and auxiliary power systems

Relay Automotive Procurement Notes

Verify the exact part number suffix against official CIT documentation to confirm coil voltage and contact configuration. Ensure the procurement channel provides valid manufacturer certificates of conformity. Cross-reference the datasheet specifications for thermal management requirements during installation. Confirm that the supplier offers traceability documentation consistent with automotive industry standards.

Relay Automotive Selection Notes

Select this component when designing circuits requiring a 12 VDC controlled switch with a 40 A load capacity. Consider the SPST NO configuration for standard on/off control logic. Evaluate the physical dimensions and mounting style compatibility with the target PCB or chassis. Verify that the operating temperature range aligns with the environmental conditions of the intended application site.

Relay Automotive Part Context

This relay belongs to the CIT A-Series family of automotive relays, which are engineered for high reliability in transportation environments. The series is characterized by standardized footprints and robust contact materials suitable for frequent switching operations. CIT Relay and Switch specializes in components that meet stringent automotive quality standards, ensuring long-term performance in vibration-prone and thermally variable settings.

Relay Automotive Replacement Considerations

Direct substitutes must match the 12 VDC coil voltage, 40 A current rating, and SPST NO contact form. Verify dimensional compatibility for existing mounting holes and terminal spacing. Check if alternative manufacturers offer equivalent AgSnO2 contact materials and similar switching power ratings to maintain circuit integrity.