AZ9731-1A-12DC3R1

Relay Automotive Overview

The AZ9731-1A-12DC3R1 is a 40 AMP Mini-ISO automotive electromechanical relay manufactured by American Zettler. It features a SPST-NO (1 Form A) contact arrangement with a nominal coil voltage of 12 VDC and a coil resistance of 90 Ohms. The relay supports a maximum switched current of 40 A at up to 75 VDC resistive loads, delivering 560 W power capacity. It operates within a high temperature range of 125 °C and includes quick connect terminals for socketable installation.

Relay Automotive Feature Summary

• High switching capability with 40 Amp contact rating in a compact Mini-ISO footprint
• Designed for high in-rush applications with high momentary carry current tolerance
• Robust construction resistant to vibration and shock suitable for automotive environments

Relay Automotive Applications

• Automotive electrical systems
• High-current load switching circuits
• Vehicle accessory power management

Relay Automotive Procurement Notes

Verify the specific suffix configuration against the manufacturer datasheet to ensure compatibility with required coil suppression components and terminal types. Confirm that the socket interface matches the intended PCB or panel mount design. Cross-reference the dielectric strength and insulation ratings with system safety requirements before final procurement approval.

Relay Automotive Selection Notes

Select this component when a 40 Amp single-pole normally-open switch is required for 12 VDC automotive control circuits. Ensure the application voltage does not exceed 75 VDC for resistive loads without special precautions. Consider the 125 °C operating limit for high-temperature engine bay installations compared to lower-rated general-purpose relays.

Relay Automotive Part Context

This part belongs to the AZ9731 Mini-ISO series, designed specifically for automotive use. It offers a balance of high current handling and compact size, utilizing standard ISO pin configurations for easy integration into existing vehicle wiring harnesses and relay sockets.

Relay Automotive Replacement Considerations

Direct substitutes include other AZ9731 variants with matching coil voltages and contact forms, such as AZ9731-1A-12DC1 or AZ9731-1A-12DC3ER1, provided the coil resistance and terminal style are compatible.