A2S1ASQ24VDC1.9D

Relay Automotive Overview

The A2S1ASQ24VDC1.9D is an automotive relay manufactured by CIT Relay and Switch, featuring a SPST-NO (1 Form A) contact arrangement. It operates with a 24VDC coil and supports a maximum switching voltage of 75VDC with a rated current of 40A. The device includes a built-in diode for surge suppression and utilizes quick connect terminals measuring 0.250 inches (6.3mm). Key electrical parameters include a release voltage minimum of 2.4VDC and a mechanical life expectancy of 100,000 cycles under average conditions.

Relay Automotive Feature Summary

• SPST-NO contact configuration for single circuit control
• Integrated flyback diode for inductive load protection
• Quick connect terminal style for rapid chassis mounting
• Sealed construction designed for automotive environments

Relay Automotive Applications

• Automotive lighting circuits
• Vehicle accessory power management
• Industrial control panel switching
• General purpose low-voltage DC applications

Relay Automotive Procurement Notes

Verify the specific ordering suffix to confirm the inclusion of the internal diode, as variations exist within the A2S series. Ensure the terminal pitch matches the target chassis socket specifications. Confirm RoHS compliance status if required by project regulations. Cross-reference the coil resistance value against available driver circuit capabilities to ensure proper actuation.

Relay Automotive Selection Notes

Select this component when a normally open single-pole switch is required for loads up to 40A at 75VDC. The 24VDC coil rating suits standard commercial vehicle electrical systems. Consider the sealed design for durability in harsh environments. Evaluate the mechanical life cycle requirements against the 100,000-cycle specification before finalizing the part choice.

Relay Automotive Part Context

This relay belongs to the CIT A2 series, which focuses on compact automotive solutions. The A2S variant specifically denotes the SPST-NO configuration with quick-connect terminals. This series is engineered to replace legacy electromechanical relays in modern vehicle architectures, offering improved reliability and consistent performance across temperature ranges.

Relay Automotive Replacement Considerations

Direct substitutes may include other CIT models within the A2S family sharing identical pinouts and coil voltages. Verify that alternative parts maintain the same 40A rating and diode configuration. Check physical dimensions to ensure compatibility with existing mounting brackets and connector housings.