What's in the box
PoE Adapter kit contents
PoE Adapter
IEEE 802.3af RJ45 input. 5V 400mA USB-A output. 10/100 Mbps LAN pass-through. Dimensions: 35 × 37 × 23 mm. | Mounting bracket
108 mm diameter. Fits standard EU/US ceiling junction boxes or mounts direct-to-structure. |
USB cable
200 mm USB-A to USB-C. Connects the adapter output to the M3 sensor’s USB-C charging port. | Mounting screws
For securing the bracket to a ceiling junction box or structural surface. |
Specifications
Input | IEEE 802.3af Power over Ethernet, 37–57V DC via RJ45 |
Output | 5V DC, 500mA; USB-A port |
Network | 10/100 Mbps Ethernet, Auto MDI-X via RJ45 pass-through |
PoE standard | IEEE 802.3af; requires a PoE-capable switch or injector |
Adapter dimensions | 35 × 37 × 23 mm |
Mounting bracket | 108 mm diameter. Fits standard EU/US ceiling junction boxes. |
USB cable | 200 mm, USB-A to USB-C. M3 sensor only. |
When to use the PoE Adapter
The PoE Adapter is the right choice when your building has managed Ethernet infrastructure and you want to eliminate both battery maintenance and Wi-Fi dependency in a single installation.
Best for | Multifamily, student housing, and hotel deployments where managed Ethernet runs are available at each unit or room |
Wif not required | The sensor connects to the network via the Ethernet cable; no Wi-Fi password needed during installation. The sensor can also use Wi-Fi as a fallback if preferred. |
IT Network | Suits environments where IT policy requires devices to be on a managed wired network. Ensure ports 25500 (TCP), 1993 (UDP), and 443 (HTTPS) are open outbound on your network. |
vs AC Power Adapter | If you only need continuous power and Wi-Fi connectivity is reliable, the AC Power Adapter is simpler to install. Use PoE when you want both power and wired network in one cable. |
Installation
Check your switch supports IEEE 802.3af before installation. A standard (non-PoE) switch will not power the adapter. Most managed switches support this standard; check your switch documentation or IT team to confirm.
The USB cable is 200 mm (approximately 20 cm). Plan your mounting position so the adapter sits within 20 cm of the sensor; inside the ceiling void, in the junction box, or surface-mounted alongside the bracket.
Run the Ethernet cable to your mounting location
Route a Cat5e or Cat6 Ethernet cable from a PoE-capable switch port to the installation location. Maximum cable run: 100 m per segment.
Mount the bracket
Secure the mounting bracket at your chosen ceiling or wall location using the included screws. The bracket fits standard ceiling junction boxes or can be fixed directly to a structural surface.
Connect the PoE adapter
Plug the Ethernet cable into the RJ45 input port on the PoE Adapter. Connect the USB-A to USB-C cable from the adapter’s USB-A output to the USB-C port on the back of the M3 sensor.
The sensor powers on automatically once the Ethernet cable delivers PoE power
Attach the sensor and confirm
Snap the M3 sensor onto the mounting bracket magnetically. Confirm the sensor is online in the Minut app. The sensor will use the wired Ethernet connection for network access.
Green light = online and monitoring
MAC address for network whitelisting. If your building uses device access controls, you may need to whitelist the M3 sensor’s MAC address. Find it on the label on the back of the sensor, or in the app under Properties → rental unit → sensor → ⚙ → Advanced.
Already have the sensor installed? Use Sensor Swap to transfer all settings and data to the newly wired sensor without a full reinstall.
Battery protection mode
When the M3 is permanently powered via PoE, it automatically enters battery protection mode holding the battery at a slightly lower level than full to prevent degradation from continuous charging. This is normal and expected.
What you may notice | Battery level in the app may show at 80–90% rather than 100% even while permanently powered. |
Is monitoring affected? | No. All features work normally at all times. |
Low battery alerts | Will not trigger for a permanently wired sensor. Battery maintenance is eliminated. |
Compatibility
Compatible sensors | M3 sensor only. Not compatible with the M2 (Micro-USB port) or the E1 (has its own built-in power options). |
PoE switch required | IEEE 802.3af compliant PoE switch or PoE injector. Standard (non-PoE) switches will not power the adapter. |
Indoor only | For indoor installations only. Not recommended for M3 sensors in outdoor mode. |
Purchase | Available at store.minut.com. Select the PoE Adapter kit at checkout. |