TD228-4002P

Overview

The TD228-4002P is a hermetically sealed electromechanical time delay relay manufactured by TE Connectivity Aerospace, Defense and Marine. It features a double-pole double-throw (DPDT) configuration with two Form C contacts. The unit provides a fixed on-delay timing of 40 seconds. It is rated for a contact current of 10A at 28VDC and utilizes a DC coil input. Designed for chassis or panel mounting, the relay operates reliably in environments up to 125°C.

Feature Summary

• Hermetically sealed construction for environmental protection
• Fixed 40-second on-delay timing function
• DPDT (2 Form C) contact arrangement
• Chassis and socket mount compatibility

Applications

• Aerospace control systems requiring precise timing sequences
• Defense electronics needing hermetic sealing against moisture and contaminants
• Industrial automation panels utilizing 28VDC control circuits
• Marine equipment installations demanding high reliability

Procurement Notes

Verify the specific coil voltage requirements against the system design, as the model specifies 28VDC operation. Confirm that the fixed 40-second delay aligns with the application's timing needs, as this parameter cannot be adjusted. Ensure the mounting interface supports the chassis or socket installation method specified for this component type.

Selection Notes

Select this component when a hermetically sealed, fixed-delay solution is required for critical aerospace or defense applications. The DPDT configuration allows for switching two independent circuits simultaneously after the delay period. Consider the 10A contact rating and 125°C operating temperature range to ensure compatibility with the electrical load and environmental conditions of the target system.

Part Context

This relay belongs to the CII Electromechanical Relays product line from TE Connectivity. It is designed for rugged environments where standard commercial relays may fail due to humidity, vibration, or pressure changes. The hermetic seal distinguishes it from non-sealed alternatives, offering enhanced longevity in harsh operational settings typical of military and aviation sectors.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing sockets and wiring harnesses before considering alternative models from other manufacturers.