Eaton D4PR21A Ac Operated Plug-in Relay

Product Description

The EATON D4PR21A is an AC operated plug-in relay designed for use in industrial and commercial control circuits. Plug-in relays of this type serve as switching devices that open or close control circuit paths in response to an input signal, making them a foundational component in motor control panels, HVAC control systems, and building automation equipment. The D4PR21A is sized for standard relay sockets, allowing straightforward field replacement without rewiring the base. Electricians and controls technicians are the typical installers.

This relay is suited for light commercial and industrial applications where an AC coil voltage is required to actuate the switching contacts. Common installation scenarios include relay panels, packaged HVAC units, air handling units, and general-purpose machine control cabinets where plug-in relay bases are already in place. The AC operated design makes it compatible with standard line-voltage or low-voltage control circuits depending on the coil rating.

Key Features

• AC operated coil for compatibility with standard control circuit voltages
• Plug-in form factor enables fast field replacement without rewiring relay base
• Suitable for use in motor control, HVAC, and building automation panels
• Compact design fits standard relay socket footprints

Compatibility

Designed as an OEM-style replacement plug-in relay for industrial and commercial control panel applications using compatible relay socket bases.

Installation Notes

Installation should be performed by a qualified electrician or controls technician in accordance with applicable NEC requirements. De-energize the control panel and verify the absence of voltage before removing or inserting the relay. Confirm the relay socket base coil voltage rating matches the D4PR21A before energizing the circuit. Do not force the relay into the socket base, as misalignment can damage the contact pins.

Technical Specifications

• Coil Type: AC Operated
• UPC: 78211416060

Standard Information

• Brand: EATON
• Manufacturer Part Number: D4PR21A