Manufacturer product photo · 4×PoE + 2×Uplink
S402EI
Atlas · Unmanaged PoE · 4-Port Family
4-Port PoE Switch Family · Three Configurations: Fast Ethernetor Full Gigabit
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◆IEEE802.3af/at PoE
◆30W per Port
◆250m Extend Mode
◆Fanless & Silent
◆IP30 Metal Housing
◆-10~70°C Commercial Grade
Overview
The Atlas S402EI is a compact 6-port unmanaged Fast Ethernet PoE switch built for small camera installations. It provides 4 x 10/100M PoE ports (IEEE802.3af/at, up to 30W per port with smart powered-device detection) plus 2 x 10/100M uplink ports, all inside a fanless IP30 metal enclosure drawing up to 52W. An Extend mode stretches the PoE and data link out to 250m on any port by stepping the link rate down to 10Mbps, so installers can run a camera well past the standard 100m Ethernet limit without adding a separate power line at the far end. Store-and-forward switching, auto-negotiation with auto MDI/MDIX, and a built-in watchdog auto-reset keep the unit stable under continuous camera loads, while the -10 to +70°C rated housing covers unheated cabinets, gate booths and rooftop enclosures.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
Small retail shop or convenience store with a handful of cameras4 PoE ports cover a typical 3-4 camera storefront, and the 2 uplink ports connect straight to an NVR or router — no separate PoE injector or extra power run needed.
Home or small residential monitoringA compact desktop unit that sits behind a router without extra noise or heat — enough ports for a front door, driveway, backyard and side gate camera.
Small guesthouse or single-floor B&BCovers hallway and entrance cameras on one switch without running a separate power outlet to each camera location — useful where wiring an extra socket means breaking into finished walls.
Budget-conscious retrofit of an existing 100M camera networkWhere the existing cameras and cabling are already Fast Ethernet, this model matches the network speed at the lowest cost per port instead of paying for gigabit capacity that will not be used.
Detached garage, workshop or small storage roomA rugged metal, fanless build tolerates dust and temperature swings in an unheated outbuilding, while still being small enough to tuck onto a shelf or wall bracket.
Gate booth or entrance camera 200+ meters from the equipment roomExtend mode pushes the PoE and data run to 250m on copper, covering a distant gate or car park entrance that standard 100m Ethernet cannot reach without adding a repeater.
Not a good fit if:
- Unmanaged Layer 2 only — no VLAN segmentation or STP/RSTP; choose a managed switch if network isolation or spanning tree is required.
- No ring/loop redundancy protocol — wire in star, tree or bus topology only; do not create physical wiring loops between ports.
- Commercial-grade -10 to +70°C housing in a compact desktop/wall-mount form factor — not rated for industrial wide-temperature extremes and not rack-mountable without accessories.
Key Features
- 4 x 10/100M PoE ports, IEEE802.3af/at, up to 30W per port with smart PD detection
- 2 x 10/100M uplink ports to NVR or router
- Extend mode: PoE + data reach up to 250m (link rate steps down to 10Mbps)
- No extra power cable to the camera — PoE carries power and data on one cable, cutting install cost
- Fanless metal housing — silent operation, no moving parts to fail
- Built-in watchdog auto-reset keeps the switch stable under heavy camera loads
- Store-and-forward switching with flow control, auto-negotiation and auto MDI/MDIX
Specifications
IEEE Standards
| IEEE802.3 | 10Base-T Ethernet |
| IEEE802.3u | 100Base-TX Fast Ethernet |
| IEEE802.3x | Flow Control |
| IEEE802.3af | PoE |
| IEEE802.3at | PoE+ |
Switching
| Switching Capacity | S402EI 1.6 Gbps · S4G02GI 14 Gbps |
| Forwarding Rate | S402EI 1.1904 Mpps · S4G02GI 10.416 Mpps |
| MAC Address Table | S402EI 2K · S4G02GI 2K |
| Flow Control | Supported (IEEE 802.3x) |
| Auto MDI/MDI-X | Supported |
Interfaces
| S402EI — PoE Ports | 4 × 10/100Base-TX (RJ45), IEEE 802.3af/at |
| S402EI — Uplink | 2 × 10/100Base-TX (RJ45) |
| S4G02GI — PoE Ports | 4 × 10/100/1000Base-T (RJ45), IEEE 802.3af/at |
| S4G02GI — Uplink | 2 × 10/100/1000Base-T (RJ45) |
| Switching Mode | Store-and-forward |
| LED Indicators | PWR (power), red (PoE status), blue (link/activity) |
PoE
| PoE Standard | IEEE802.3af / IEEE802.3at |
| PoE Ports | 4 |
| Max Power per Port | 30W |
| Powered Device Detection | Automatic, smart detection — will not damage non-PoE devices |
| PoE Extend Mode | S402EI only — up to 250 m, that port drops to 10 Mbps. Gigabit configurations: standard 100 m. |
| PoE Mode | Mode A (power over data pairs) |
Power
| Input Voltage | AC 100–240 V |
| Power Supply | Built-in power supply, DC 52V 1A |
| Total Power Consumption | < 52 W at full load |
| Protection | Reverse-polarity and overload protection |
Physical
| Dimensions | S402EI 128 × 110 × 32 mm · S4G02GI / |
| Housing | Metal, fanless |
| Cooling | Fanless (0 fans) |
| Protection Rating | IP30 |
| Mounting | Desktop or wall-mount |
Environment
| Operating / Storage Temperature | -10°C ~ +70°C |
| Humidity | 5%–95% RH, non-condensing |
| Protection Rating | IP30 |
| MTBF | 50,000 hours (manufacturer figure) |
Package
| Units per Carton | S402EI 50 units/carton · S4G02GI 40 units/carton |
| Packing Dimensions | 195 × 164 × 44 mm |
| Unit Weight | 0.6 kg per unit |
| Box Contents | Switch × 1, power cord × 1, manual × 1, certificate × 1, warranty card × 1 |
Models & Ordering
| Model | Product Description | Price |
|---|---|---|
| S402EI | 4 × 10/100M PoE ports + 2 × 10/100M uplink ports. 52W total PoE budget, 30W per port. Switching capacity 1.6 Gbps, MAC table 2K, 128 × 110 × 32 mm. The entry configuration for standard-definition and 2MP camera points. | Get Quote |
| S4G02GI | 4 × 10/100/1000M PoE ports + 2 × Gigabit uplink ports. 52W total PoE budget, 30W per port. Switching capacity 14 Gbps, MAC table 2K, 145.8 × 114.2 × 36 mm. Gigabit to every camera — the configuration for 4K and multi-sensor units. | Get Quote |
All three configurations share the same fanless metal housing, the same 52 W PoE budget with 30 W per port, IEEE 802.3af/at support and the same −10 to +70 °C rating. The two Gigabit configurations follow the standard 100 m copper limit — for longer runs use the SFP fibre version. A fibre-uplink version, S4G02GFI-SFP, is listed separately.
Dimensions
unit: mm
Your Brand. Factory-Direct Supply.Neutral casing, ready for your logo · Custom port/power options · Small batches welcome.
Custom & OEM →Who uses it, where it goes and how to install it
Written for the Atlas S402EI / S4G02GI from their own specifications: 4 PoE ports (802.3af/at) + 2 uplinks, 52 W budget with up to 30 W per port, Fast Ethernet with 250 m extend mode (S402EI) or full gigabit (S4G02GI), fanless desktop or wall mount.
Who it is for
- Small shops, homes and offices with 2 to 4 cameras — 4 PoE ports run 4 fixed IR cameras at a typical 6 W (24 W) with room to spare, and the 2 uplinks connect straight to a 4-channel NVR and the router. The unit is only 128 × 110 × 32 mm (S402EI) and fanless, so it sits quietly on a shelf.
- Installers reaching a far gate or car park camera — The S402EI's extend mode reaches up to 250 m on a port at 10 Mbps, so a small switch in a gate booth or outbuilding can power a camera beyond the 100 m Ethernet limit without a repeater.
- Projects with 4K or multi-sensor cameras — The S4G02GI version has gigabit on all 6 ports, so it can also feed a gigabit AP or sit in a gigabit network; it has no extend mode and keeps the standard 100 m per cable.
- Distributors stocking a small private-label switch — An Atlas factory-direct model with a neutral casing ready for your logo, custom port/power options and small batches; 50 units per carton for the S402EI and 40 for the S4G02GI.
Where and how to install
- Shelf or wall, indoors or inside a closed box — Mount it on a desk, shelf or wall; it is not rack-mountable without accessories. The case is IP30, so in a gate booth, garage or on a roof it must sit inside a weatherproof enclosure; the rating is -10 °C to +70 °C and 5–95% RH without condensation, so keep the box out of direct sun and away from condensation.
- Mains power: AC 100–240 V — The supply is built in (DC 52 V 1 A) with AC 100–240 V input, so it runs directly on 110–127 V or 220–240 V mains. Total consumption is under 52 W at full load, which is small enough for the same UPS as a 4-channel NVR.
- Camera cable lengths — Normal mode: up to 100 m of Cat5e/Cat6 per camera. S402EI only: extend mode for up to 250 m at 10 Mbps on that port. Use solid pure-copper cable; on long PoE runs copper-clad aluminium loses too much voltage and the camera reboots at night when its IR turns on.
- Uplink to the NVR or router — Connect the NVR to one uplink and the router to the other, each by copper up to 100 m. There is no SFP slot on these two versions: if the run back to the recorder is longer than 100 m, the S4G02GFI-SFP has 2 fibre uplinks. Never connect both uplinks to the same switch, since there is no STP to stop the loop.
- Earthing and surge on outdoor cables — The page lists reverse-polarity and overload protection but no surge rating. A 250 m cable to a gate or pole picks up lightning surges easily, so fit an Ethernet surge protector at the switch end, earth the enclosure and use the earthed plug of the supplied power cord.
PoE budget: how many cameras
The 52 W total, not the 30 W per port, is the limit, and the page gives under 52 W as the whole unit's full-load consumption, so plan with headroom: 4 fixed cameras use about 24 W, but 4 mini PTZ at 13 W would already be 52 W. In practice that means up to 3 mini PTZ, or 1 large PTZ plus 3 fixed cameras.
| S402EI | S4G02GI | S4G02GFI-SFP | |
|---|---|---|---|
| PoE ports / uplinks | 4 + 2 RJ45 | 4 + 2 RJ45 | 4 + 2 SFP |
| Access port speed | 10/100 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| PoE budget / max per port | 52 W / 30 W | 52 W / 30 W | 52 W / 30 W |
| 4 MP IR cameras at 6 W | 4 (24 W) | 4 (24 W) | 4 (24 W) |
| Mini PTZ at 13 W | 3 (39 W) | 3 (39 W) | 3 (39 W) |
| Large PTZ at 25 W + fixed at 6 W | 1 + 3 (43 W) | 1 + 3 (43 W) | 1 + 3 (43 W) |
| Extend mode | 250 m @ 10 Mbps | — (100 m) | — (100 m) |
| Uplink: copper (100 m) / SFP fibre | 2 × 100 Mbps copper | 2 × GE copper | 2 × 1000Base-X SFP |
| Size | 128 × 110 × 32 mm | 145.8 × 114.2 × 36 mm | 145.8 × 114.2 × 36 mm |
- 2–4 ordinary cameras next to the NVR, or one camera up to 250 m away: the S402EI; 4 cameras at 8 Mbps use 32 Mbps, well inside its 100 Mbps uplink.
- A gigabit AP or a gigabit network: the S4G02GI. The switch more than 100 m from the recorder: the S4G02GFI-SFP with fibre uplinks.
- More than 4 cameras, or 2 large PTZ: move to an 8-port model such as the S802EI.
Camera draws (6 W, 13 W, 25 W) are typical assumptions, not page figures: add up the maximum power from each camera's datasheet, since IR and heaters raise the draw at night. Counts keep headroom because the page states under 52 W for the whole unit at full load. S4G02GFI-SFP figures come from its own page on this site.
4-Port PoE Switch FAQ — S402EI
How many cameras can the S402EI power?
Four PoE cameras at once. Total consumption stays under 52 W at full load — 13 W average per port — while typical IP cameras draw 4–12 W, and any single port can deliver up to 30 W under IEEE 802.3af/at. Two extra 10/100 M uplink ports connect the NVR or router.
How far can it reach a camera in Extend mode?
Up to 250 m of PoE power plus data on the S402EI, with that port's link rate stepping down to 10 Mbps — no separate power line needed at the far end. Standard operation covers 100 m. The gigabit configurations of this family stay at the standard 100 m.
What is the difference between the S402EI and the S4G02GI configuration?
The S402EI is Fast Ethernet: 4 × 10/100 M PoE plus 2 × 10/100 M uplinks, 1.6 Gbps capacity, and the 250 m Extend mode. The S4G02GI configuration is full gigabit on all six ports with 14 Gbps capacity at the standard 100 m. Both share the 2K MAC table, 30 W per port and IEEE 802.3af/at.
Will it damage a non-PoE device plugged into a PoE port?
No. Powered-device detection is automatic and smart: the port only injects power after confirming an IEEE 802.3af/at device is present, so laptops, printers or plain switches connect safely. The unit also carries reverse-polarity and overload protection, and power rides the data pairs in Mode A.
How rugged is it, and how is it installed?
A fanless IP30 metal case of 128 × 110 × 32 mm, 0.6 kg, for desktop or wall mounting. The built-in DC 52 V 1 A supply accepts AC 100–240 V, operation spans −10 °C to +70 °C at 5–95 % humidity, and quoted MTBF is 50,000 hours. Resellers get 50 units per carton.
Can the S402EI power two PTZ cameras at 25–30 W each?
Not reliably. Each port can give 30 W, but the total is 52 W: 2 × 30 W would be 60 W, and 2 × 25 W is 50 W, which leaves almost nothing for the switch itself. One PTZ at 25 W plus 3 fixed cameras at 6 W (43 W) is a safe mix; for two large PTZ cameras use an 8-port model such as the S802EI.
How should I set up a camera on an S402EI port in extend mode?
Plan for 10 Mbps on that port: use H.265, a main stream of about 4 Mbps or less and a small sub-stream, so live view and recording stay smooth. If the camera does not link, set its network port to 10 Mbps full duplex. The 250 m is a best case that depends on solid-copper Cat5e/Cat6 and on the camera, so test the full run before the cable is buried. The S4G02GI has no extend mode.
Does the S402EI work with Hikvision, Dahua, Uniview or other camera brands?
Yes, with any camera or AP that takes standard IEEE 802.3af or 802.3at PoE, whatever the brand. The switch detects the device before powering it and uses Mode A (power on the data pairs), which standard PoE devices accept. Passive 12 V or 24 V PoE devices and 802.3bt devices above 30 W are not supported.
Will the S402EI run on 110–127 V mains?
Yes. The input is AC 100–240 V into the built-in DC 52 V 1 A supply, so it works directly on 110–127 V or 220–240 V mains with no transformer or external adapter. Only the plug type may differ by country; tell us your socket type when ordering.
Can I chain several S402EI switches back to one NVR?
Yes, uplink to uplink, but every link between them is 100 Mbps, so all cameras behind a link share it. For example 3 switches with 12 cameras at 4 Mbps use 48 Mbps, which fits; keep the total below about 70–80 Mbps. Build a star or chain only, never a loop, since there is no STP; for a gigabit chain use the S4G02GI, and for a link over 100 m the S4G02GFI-SFP.
Can the S402EI and S4G02GI be supplied under our own brand?
Yes. Both are Atlas factory-direct switches in a neutral casing ready for your logo, with custom port/power options and small batches welcome; cartons hold 50 S402EI or 40 S4G02GI units. Printed boxes or custom packaging are not described on the page, so send us your logo, quantities and packaging needs and we confirm them in the quotation.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
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