A21CSP12VDC1.6D

Relay Automotive Overview

The A21CSP12VDC1.6D is an automotive electromechanical relay manufactured by CIT Relay and Switch, designed for high-current switching applications. It features a SPDT (Single Pole Double Throw) contact arrangement with a maximum switching current of 40A at 14VDC. The coil operates on a rated voltage of 12VDC, drawing a current of 133.3 mA with a resistance of 90 Ohms and a power consumption of 1.6W. The unit utilizes quick connect terminals for mounting and includes integrated diode protection within its sealed housing.

Relay Automotive Feature Summary

• High switching capacity supporting up to 40A loads
• Compact physical dimensions suitable for space-constrained installations
• Integrated diode protection for coil circuit safety
• Sealed construction ensuring environmental durability

Relay Automotive Applications

• Automotive electrical systems
• Lamp accessories control
• General purpose industrial switching

Relay Automotive Procurement Notes

Verify the specific ordering suffix 'D' confirms the inclusion of the integrated flyback diode, as this variant differs from standard versions lacking protection. Ensure the application environment remains within the specified operating temperature range of -40°C to 125°C. Confirm that the quick connect terminal style matches the mating connector specifications in the target design to ensure proper mechanical engagement and electrical continuity.

Relay Automotive Selection Notes

Select this component when a robust SPDT configuration is required for automotive or heavy-duty circuits. The 12VDC coil voltage aligns with standard vehicle electrical architectures. Consider the 40A rating against peak load requirements, noting the distinction between continuous and momentary ratings if applicable. The sealed design offers advantages over open-frame relays in environments requiring protection against moisture and particulate ingress.

Relay Automotive Part Context

This part belongs to the CIT A2 series of automotive relays, characterized by small size and light weight relative to their switching capacity. The series is certified under QS-9000 and ISO-9002 standards, indicating adherence to rigorous manufacturing quality controls. The A21CSP12VDC1.6D specifically represents the SPDT variant within this family, distinguished by its dual-contact capability compared to single-pole alternatives.

Relay Automotive Replacement Considerations

Direct substitutes include the A21CSP12VDC1.6 without the 'D' suffix, though verification of diode inclusion is necessary. Other compatible forms within the A2 series may serve as functional replacements if contact arrangements differ.