Programmable control relay PLC · 12/24 VDC and 24 VAC supply 8 digital inputs 4 relay outputs Ethernet and display · Eaton EASY-E4-UC-12RC1

What this product is for

The Eaton EASY-E4-UC-12RC1 is a compact programmable control relay used for small automation panels, equipment sequencing, pump and fan control, lighting control, and building service logic where a full-size PLC is not required.

Use for

Use for small machine automation, HVAC and building controls, lighting logic, alarm handling, and retrofit control panels that need relay outputs and flexible supply voltage options. It suits applications using 12/24 VDC or 24 VAC control power.

Avoid for

Avoid for high-speed motion, large distributed control systems, or applications needing extensive onboard I/O without expansion. For heavy analogue processing or advanced PLC networking, a larger PLC platform may be a better fit.

Best for

Best for electricians, panel builders, and maintenance teams who need a compact smart relay or entry PLC with local display, Ethernet connectivity, and relay outputs for straightforward field wiring.

Installed in

Typically installed in industrial control panels, commercial equipment cabinets, mechanical rooms, OEM machinery, and building automation enclosures. Base unit size is approximately 71.5 x 90 x 58 mm (2.8 x 3.5 x 2.3 in).

Why this product exists

This model fills the gap between hard-wired relays and a larger PLC. It gives contractors and OEMs a compact programmable controller with display, clock, Ethernet, and expandable I/O for common automation tasks while reducing panel space and wiring complexity.

Compared with similar products

Compared with basic timing relays or non-networked smart relays, this unit adds Ethernet communication, a local display, and expansion capability. Compared with transistor-output versions, the relay outputs are commonly chosen when switching a wider range of field control circuits. Typical application suitability depends on load type, switching frequency, and control architecture.

As practical guidance, programmable control relays like this are commonly used where a small number of field devices must be monitored and switched without moving to a larger PLC platform. Actual suitability depends on the I/O count, load characteristics, and local code requirements.

Specifications

• Manufacturer: Eaton
• Series: easyE4
• Part number: EASY-E4-UC-12RC1
• Product type: Programmable control relay / nano PLC base unit
• Supply voltage: 12/24 VDC and 24 VAC
• Digital inputs: 8
• Analogue-capable inputs: 4 of the digital inputs can also be used as analogue inputs
• Fast inputs: 4 inputs can be used as fast counters
• Outputs: 4 relay outputs
• Total onboard I/O: 12
• Display: Integrated display and keypad
• Clock: Real-time clock
• Communications: Integrated Ethernet interface
• Expansion: Expandable with easyE4 digital I/O modules
• Terminal style: Screw or push-in terminal listings vary by source; confirm terminal version before ordering
• Approximate dimensions: 71.5 x 90 x 58 mm (2.8 x 3.5 x 2.3 in)