A21CSP24VDC1.9

Relay Automotive Overview

The A21CSP24VDC1.9 is a general-purpose power relay manufactured by CIT Relay and Switch, designed for high-current switching applications. It features a 24 VDC coil voltage with a maximum switching capacity of up to 40A. The device utilizes an SPDT (1 Form C) contact configuration, supporting loads up to 380VAC or 110VDC. Key electrical parameters include a coil resistance of 960 Ohms and a coil current of 25 mA. The relay operates within a temperature range of -40°C to 125°C and includes cURus certification for safety compliance.

Relay Automotive Feature Summary

• Large switching capacity up to 40A for high-power load control
• Compact physical design ensuring small size and light weight
• Flexible mounting options including PCB pins and quick connect terminals

Relay Automotive Applications

• Automotive electrical systems
• Industrial control panels
• Power distribution units

Relay Automotive Procurement Notes

Verify the specific ordering suffix against the official CIT datasheet to confirm exact coil voltage, contact material, and terminal style. Ensure the procurement specification matches the required switching capacity and operating temperature range for the target application environment. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm current availability and authenticity before finalizing orders.

Relay Automotive Selection Notes

Select this component when a high-current switching solution is required in a compact form factor. The 24 VDC coil makes it suitable for standard automotive and industrial control circuits. Consider the 40A switching capacity for heavy loads, but verify that the contact rating aligns with the specific AC/DC voltage requirements of the circuit. The SPDT configuration provides flexibility for normally open or normally closed logic implementation.

Relay Automotive Part Context

This model belongs to the A21 series of power relays from CIT Relay and Switch, which are characterized by their robust construction and high current handling capabilities. The series is widely utilized in sectors requiring reliable electromechanical switching under demanding conditions. The A21CSP variant specifically denotes the SPDT contact arrangement and PCB/quick-connect mounting style within this product family.

Relay Automotive Replacement Considerations

Direct substitutes may include other CIT A21 series models with compatible coil voltages and contact configurations. Verify mechanical dimensions and pinout compatibility before substitution. Alternative manufacturers offering similar 40A SPDT relays with 24VDC coils should be evaluated based on thermal performance and certification requirements.