Grid Industrial Gigabit PoE Switch | 4 PoE Downlink Ports + 1 SFP Uplink | POEJK-S4SFP-120

Overview

The POEJK-S4SFP-120 is an industrial Gigabit PoE+ switch with four copper PoE+ ports and a single SFP uplink, designed for DIN-rail and wall-mount applications. It is unmanaged, supports 10/100/1000 Mbps on copper and offers a flexible 12–48 VDC input with dual redundant power connections.

This compact PoE+ switch is ideal when you need a small 4-port PoE+ edge node with fibre or SFP uplink that fits neatly into DC microgrid and remote enclosure designs.

Key features

• Industrial Gigabit Ethernet PoE switch – unmanaged for simple operation.
• 4 × 10/100/1000 Mbps copper ports with 802.3af/at PoE+ injector function on ports 1–4.
• 1 × SFP uplink port supporting 1000Base-X or 100Base-FX (auto-detection).
• Dual redundant power input (12–48 VDC) using external supplies such as POEJK-PS48-150 / -200 / -240 (sold separately).
• Output power up to 48 VDC (per manufacturer specification).
• Rugged IP40 aluminum housing for industrial and light-commercial installations.
• Extended operating temperature from -40°C to +80°C (-40°F to 176°F).
• Flexible mounting – DIN-rail, wall-mount or shelf-mount.

Technical highlights

Ideal applications

• Small camera clusters or sensor groups that need fibre or SFP uplink back to a core or IDF.
• Access points and PoE-powered devices at the edge of industrial plants, warehouses or parking lots.
• Compact field enclosures where DC power is available and a few PoE+ ports are sufficient.
• Rural or campus sites using fibre backhaul with small PoE+ islands at remote buildings.

Compatibility & ecosystem

The POEJK-S4SFP-120 integrates with GRID’s PS48 series DC supplies and SFP modules (SF-SMLC / SF-MMLC) to provide an industrial PoE+ node with fibre uplink. It can be deployed alongside larger GRID switches such as the POEJK-S48-740 / S48-3600 as a small, remotely powered spur in a broader DC microgrid.

Use standard Cat5e/Cat6/Cat6A for device connections and appropriate singlemode or multimode fibre (via SFP) for backhaul, as dictated by the site design.

Install & design notes

• Plan PoE loads carefully across the four PoE+ copper ports, staying within the capabilities of the upstream DC supply and the switch’s design.
• Choose SFP modules (SF-SMLC or SF-MMLC) and fibre types that match your required distances and existing plant.
• Use dual DC inputs where redundancy is required; consider separate feeds or supplies for resilience.
• Mount in enclosures that respect the unit’s IP40 rating and provide adequate airflow.

Canada-ready checklist

• ✓ Extended temperature range suitable for Canadian mechanical rooms, cold warehouses and sheltered outdoor enclosures (within IP40 limits).
• ✓ Ideal for small PoE+ clusters at remote buildings or yard locations tied back via fibre.
• ✓ Works with common Canadian fibre and copper cabling practices.

Compatibility micro Q&A

Is the SFP uplink required?
For most designs, yes—the SFP uplink is how you connect the switch back to your main network (using 100Base-FX or 1000Base-X). Choose a compatible SFP module based on your fibre type and distance.

Can I power it from 12 VDC?
Yes. The input range is 12–48 VDC. Ensure your supply meets the switch’s power requirements and any PoE load you intend to support.

Specifications are subject to change without notice. Confirm all technical details with the latest GRID documentation before design or tender.