A51CO24VDC1.9U

Relay Automotive Overview

The A51CO24VDC1.9U is a Mini ISO electromechanical relay manufactured by CIT Relay and Switch, designed for automotive and industrial applications. It features a 24VDC coil with a resistance of 90 Ohms and a current draw of approximately 267 mA. The contact arrangement is SPDT (Form 1C), supporting a maximum switching current of 20A normally open and 15A normally closed at 24VDC. The unit utilizes quick-connect terminals for mounting and includes an integrated suppression diode to protect the driving circuit from inductive kickback during operation.

Relay Automotive Feature Summary

• SPDT contact configuration providing both normally open and normally closed switching paths
• Integrated suppression diode for inductive load protection
• Compact Mini ISO form factor suitable for space-constrained assemblies
• Quick-connect terminal style for rapid PCB or harness installation

Relay Automotive Applications

• Automotive lighting control systems
• Vehicle accessory power distribution
• Industrial equipment signal switching
• General purpose low-voltage DC circuit protection

Relay Automotive Procurement Notes

Verify that the specific suffix 'U' corresponds to the required diode inclusion and terminal type for your design. Confirm voltage ratings match the system's operational limits. Check for RoHS compliance requirements if applicable to your region. Ensure the PCB footprint or connector matches the Mini ISO standard dimensions provided in the official datasheet.

Relay Automotive Selection Notes

Select this component when a single pole double throw switch is required with a 24VDC control signal. The 20A/15A rating suits moderate load applications. Consider the physical size constraints of the Mini ISO package against available board space. Verify that the integrated diode polarity aligns with the circuit's ground reference to ensure proper suppression functionality.

Relay Automotive Part Context

This part belongs to the CIT Mini ISO series, which offers high-current switching in a compact footprint. It complements other variants like the A2F1CCQ24VDC1.9 and A21CCQ24VDC1.9D, differing primarily in contact form and internal components. The series is widely used in automotive OEM and aftermarket applications requiring reliable electromechanical switching.

Relay Automotive Replacement Considerations

Direct substitutes include CIT Relay and Switch models A2F1CCQ24VDC1.9 and A21CCQ24VDC1.9D, though these may differ in contact configuration or bracket mounting options. Cross-manufacturer replacements require verification of pinout compatibility, coil voltage tolerance, and mechanical envelope dimensions to ensure functional equivalence.