Eaton 57151-400 General Purpose Relay

The Eaton 57151-400 is a heavy‑duty general purpose relay designed for industrial control applications. It features a DPDT (double‑pole double‑throw) contact arrangement, also known as 2 form C, providing two independent sets of normally open and normally closed contacts. The coil is rated for 24 VAC, making it suitable for use in HVAC systems, machine controls, and panel building where AC control voltages are common. The relay plugs into a standard 8‑pin octal socket, allowing for quick replacement without rewiring.

Key Features

• Contact configuration: 2 form C (DPDT)

• Coil voltage: 24 VAC (50/60 Hz)

• Contact material: Silver cadmium oxide (AgCdO) – high durability

• Contact rating: 10 A resistive at 277 VAC / 30 VDC

• Plug‑in octal base (8‑pin) with mechanical key

• LED indicator optional (sold separately)

• Dust‑proof clear polycarbonate cover

Technical Specifications

Applications

• HVAC equipment (fan coils, damper actuators, pumps)

• Industrial machine control (PLC output isolation)

• Lighting contactor replacements

• Process control panels

• Elevator and conveyor controls

Mounting and Wiring

The relay is designed for use with standard octal sockets such as Eaton 57151‑000 or equivalent. Sockets can be DIN rail mounted or panel mounted with screws. Wiring to the socket is straightforward, with pin assignments clearly marked. The optional indicator module (LED with suppression) can be plugged into the socket alongside the relay to show coil status and protect against voltage spikes.

Durability and Compliance

The 57151-400 is built to withstand harsh industrial environments. Its transparent cover allows visual inspection of contacts, and the enclosed construction protects against dust and accidental contact. The relay meets UL 508, CSA C22.2 No. 14, and RoHS requirements, ensuring safe and reliable operation.

With its robust contacts and flexible mounting, the Eaton 57151-400 general purpose relay is a dependable choice for controlling motors, solenoids, heaters, and other loads in commercial and industrial settings.