Network Switches
Lantronix SISTP1040-342-LRT 4-Port Unmanaged Hardened PoE+ Switch
The SISTP1040-342-LRT is a compact unmanaged hardened switch with four Gigabit PoE+ ports and two SFP slots, sized for small enclosures that power a handful of cameras or sensors and backhaul them over fiber.
From $418.70
Overview
About the Lantronix SISTP1040-342-LRT
Many hardened sites only need to power a few devices, such as a small group of cameras or sensors in one enclosure. The SISTP1040-342-LRT (also written SISTP1040-342 or SISTP1040342LRT) fits that job without the configuration work of a managed switch. Its four 10/100/1000 PoE+ ports each deliver 30 W at the same time from a 120 W budget, compliant with IEEE 802.3at and 802.3af, and it starts forwarding traffic the moment it is powered.
Two 100/1000 dual-speed SFP slots provide fiber uplinks and can daisy-chain several switches for reliability. Switching capacity is 12 Gbps with a 4K MAC table, 9K jumbo frames and 802.3az Energy Efficient Ethernet. The fanless IP30 metal housing is 44 mm wide and weighs 0.43 kg. It operates from -40 to +75 C on redundant 48 to 57 VDC inputs with reverse power protection, drawing 4.4 W before PoE loads.
UL Class 1 Div 2 certification allows use in hazardous locations, and a DIN-rail bracket is included in the box. Status LEDs report system state, both power inputs and each port, and a reset button restarts the switch. It shares its install and quick start guides with the 8-port SISTP1040-382-LRT.
Key capabilities
- 120 W across four ports
- All four PoE+ ports deliver 30 W simultaneously from the 120 W budget, so no port has to be derated when every device draws full power.
- 4.4 W switch overhead
- The switch itself draws only 4.4 W without PoE, keeping supply sizing simple: plan for the PoE load plus a few watts.
- Hazardous-location certified
- UL Class 1 Div 2 certification and a -40 to +75 C fanless rating allow installation in hazardous and outdoor locations.
- Two SFP uplinks
- Two 100/1000 dual-speed SFP slots support fiber backhaul or daisy chaining between switches for maximum network reliability.
- Compact DIN-rail form
- At 44 x 130 x 135 mm and 0.43 kg, the switch fits small cabinets, with a DIN-rail bracket included and wall mounting via WMBH-01.
How to choose the right SISTP1040-342-LRT part number
SISTP1040-342-LRT is a single switch model, so selection is about the parts around it. The 25105 industrial DIN-rail power supply is listed as compatible for the 48 to 57 VDC input; size any supply for the 120 W PoE budget plus 4.4 W for the switch. SFP modules for the two 100/1000 slots are ordered separately. DRBH-01 is a spare DIN-rail bracket, WMBH-01 adds wall mounting, and OCA-P181610 is a vented outdoor cabinet with DIN rails, terminal blocks and wire glands.
Configure & order
Find your SISTP1040-342-LRT part number
Every orderable SISTP1040-342-LRT configuration, filtered by the specs that actually differ between them. Pick what you need on the left and the matching part numbers appear here.
Complete the deployment
Accessories, renewals & add-ons
Everything sold for the SISTP1040-342-LRT, organized by what it does — power, mounting & enclosures— each with why you'd add it.
Power
1 item
25105
25105
Industrial DIN rail mounted power supply with 88-264 VAC and 124-370 VDC input ratings. It provides 48~55 VDC output at 2.5A and 120 Watts.
$291.50
4 in stock
Mounting & enclosures
3 items
DRBH-01
DRBH-01
DIN rail bracket kit for hardened switches. It is listed for SISPM, SISGM and SISTx products, with compatible products identified by Lantronix for multiple SISPM1040, SISGM1040,…
$11.00
1 in stock
WMBH-01
WMBH-01
Wall mount bracket for SISPM1040-384-LRT-C, SISPM1040-362-LRT, and SISPM1040-582-LRT switches.
$33.00
3 in stock
OCA-P181610
OCA-P181610
18 x 16 x 10” polycarbonate outdoor cabinet assembly for Lantronix outdoor switches.
$948.75
Ships on backorder
Compatibility taken from the Lantronix part-number tables for the SISTP1040-342-LRT. Don't see what you need? Request a quote — we can source the full Lantronix catalog.
Where the SISTP1040-342-LRT is used
- Powering a few PoE cameras on poles or building corners
- PoE sensors and radios in hazardous-location enclosures
- Fiber daisy chains along roadways or rail lines
- Small factory cells needing unmanaged PoE+ with fiber uplink
SISTP1040-342-LRT datasheets & documentation
- Product BriefPDF
- SISTP1040-342-LRT Product Brief (A4)PDF
- SISTP1040-342-LRT Datasheet (212.20 KB)PDF
- SISTP1040-342-LRT & SISTP1040-382-LRT Quick Start Guide Rev EPDF
- PoE Switches & Media Converters MatrixPDF
- Unmanaged Hardened Switches Overview (PDF 202.75 KB)PDF
- SISTP1040-342-LRT & SISTP1040-382-LRT Install Guide Rev GPDF
SISTP1040-342-LRT FAQ
How much PoE does the SISTP1040-342-LRT provide?
It has a 120 W PoE budget and delivers 30 W on all four PoE+ ports simultaneously. It complies with IEEE 802.3at and 802.3af, so both PoE+ and standard PoE powered devices are supported.
Is the SISTP1040-342-LRT a managed switch?
No. It is an unmanaged Layer 2 switch with a wire-speed store-and-forward engine, so there is no configuration interface. Status LEDs show system, Power1, Power2 and port status, and a reset button resets the switch.
What power input does the SISTP1040-342-LRT need?
It requires 48 to 57 VDC on redundant inputs with reverse power protection. The switch consumes 4.4 W without PoE, so a supply must cover that plus up to 120 W of PoE load. The 25105 DIN-rail supply is listed as compatible.
What is the operating temperature of the SISTP1040-342-LRT?
The switch operates from -40 C to +75 C at 5% to 95% non-condensing humidity, in a fanless IP30 metal housing. It is certified UL Class 1 Div 2, CE, FCC Part 15 and IEC/EN 62368-1.
