A21ASP12VDC1.6R

Relay Automotive Overview

The A21ASP12VDC1.6R is a sealed SPST-NO automotive relay from the CIT A2 series, rated for 40A at 14VDC with a 12VDC coil. It features quick connect termination and includes an integrated 680 Ohm resistor within the 1.6W coil circuit. The unit utilizes AgSnO2 contacts and operates reliably between -40°C and 125°C.

Relay Automotive Feature Summary

• Fully sealed construction designed for harsh automotive environments
• Integrated coil resistor for circuit protection and stability
• High current switching capacity suitable for heavy loads
• Quick connect termination for simplified assembly

Relay Automotive Applications

• Automotive lighting circuits
• Motor control systems
• Heater and fan management
• General vehicle accessory power distribution

Relay Automotive Procurement Notes

Verify that the specific suffix 'R' confirms the presence of the internal 680 Ohm resistor, as standard variants may lack this component. Ensure the application voltage aligns with the 12VDC coil rating and confirm that the quick connect pin dimensions match the target socket interface before finalizing procurement.

Relay Automotive Selection Notes

Select this model when a sealed, high-current single-pole solution is required for automotive use. The integrated resistor simplifies driver circuit design by suppressing back EMF. Consider the operating temperature range and contact material compatibility with the specific load type to ensure long-term reliability in the intended environment.

Relay Automotive Part Context

This component belongs to the CIT A2 series of automotive relays, which are characterized by compact dimensions and robust sealing. The A21ASP variant specifically denotes a single-pole normally-open configuration, distinguishing it from multi-form or double-pole alternatives within the same product family.

Relay Automotive Replacement Considerations

Public confirmed substitute part numbers: A2S1ASQ12VDC1.6 (Note: Verify if the non-R variant meets resistor requirements). A21ASP12VDC1.6 (Non-resistor version).