ERO Electronic ISR.025.400.000 Solid State Relay 25–52A 400Vac 4.5–35VDC New

Brand: ERO Electronic (Siebe Group / Eurotherm family).
Model: ISR.025.400.000 industrial solid state relay with factory‑matched aluminium heatsink, panel‑mount bracket, and front status LED.

Condition: New old stock / never used. The relay and heatsink assembly remain in the original ERO Electronic cardboard box with instruction leaflet; terminals and mounting hardware show no signs of installation, while the box has shelf/storage marks from long‑term warehouse keeping.

Technical details (based on ISR/ISL datasheet family – buyers should confirm exact ratings on the product label and included leaflet):

• Type: Single‑phase AC solid state relay with SCR output, zero‑cross switching

• Nominal load voltage: 400 Vac rms (typical operating range about 24–530 Vac for this family)

• Nominal current: 25–52 A AC depending on cooling and duty cycle

• Control input: 4.5–35 VDC logic, optically isolated

• Assembly: Black relay module clipped to finned aluminium heatsink with panel‑mount lugs and covered terminals, designed for vertical mounting and natural convection cooling

Main features and benefits:

• Heavy‑duty SCR design provides reliable switching for resistive and many inductive loads with long electrical life.

• Integrated heatsink simplifies thermal design; no need to size and mount a separate heat spreader.

• Wide control‑voltage range (4.5–35 VDC) makes it easy to drive directly from PLC outputs, temperature controllers, or other logic devices.

Typical applications:

• Industrial process heating, ovens, and plastics machinery using 400 Vac heater circuits.

• General AC power switching where fast, silent, and maintenance‑free control is required.

• Ideal for panel builders, OEMs, and MRO users needing a robust 25–50 A‑class SSR assembly.