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Cisco Meraki Documentation

MT40 Installation Guide - Smart Power Controller


The Cisco Meraki MT40 sensor is a cloud-managed Smart In-line power monitoring sensor that is exceptionally simple to deploy and configure due to its integration into the Meraki dashboard and the use of BLE technology. With both internal Meraki integrations and external integrations, the possibilities of what you can enable with MT40 are nearly endless.


Pre-Installation Preparation

The following steps before going on-site to perform an installation

Configure Your Network in Dashboard 

The following is a brief overview of the steps required to add an MT40 to your network. For detailed instructions about creating, configuring and managing Meraki Sensor networks, refer to the online documentation (

  1. Login to If this is your first time, create a new account.
  2. Find the network to which you plan to add your sensor or create a new network.
  3. Add the sensors to your network. You will need your Meraki order number (found on your invoice) or the serial number of each sensor, which looks like Qxxx-xxxx-xxxx, and is found on the back of the unit or included in the box.
  4. Add the gateway (MV or MR) to the same network as the sensor.

NOTE: Make sure the gateway is in the same network and is online and operational.
MV Set up Instructions and MR Set up Instructions.

List of Compatible Gateways:


Gen2: MV2, MV12(W/WE/N), MV22(X), MV32, MV72(X)

Gen3: MV13, MV33, MV63(X), MV93(X)

Wi-Fi 5 Wave 2 APs - MR33, MR42, MR42E, MR52, MR53, MR53E, MR74, MR84

Wi-Fi 6 APs - MR28, MR36, MR36H, MR44, MR45, MR46, MR46E, MR55, MR56, MR76, MR78, MR86 

Wi-Fi 6E APs - MR57, CW9162I-MR, CW9164I-MR, CW9166I-MR

Minimum Firmware Version

1.4.1 5.3 29.6.1

The minimum firmware version for MT40 is different from other MT sensors. While MT40 will still be operational on lower firmware versions, some features might not be available.

Installation Instructions

In the Box


  • MT40 Sensor
  • Velcro Mounting Strap
  • Mounting Bracket
  • Mounting Anchor and Screws
  • C13 and C14 Cable Retention Sleeves

Choosing Your Mounting Location

For most mounting scenarios, the MT40 has a flexible option to provide quick and simple mounting. The MT40 can be used in place and is able to rest on any surface while being used, however we currently have 2 options for mounting the device. 

Wall Mount

The instructions are as follows:

  1. Attach the metal bracket through the holes in the bottom of the device.

  2. Mount the sensor, a metal bracket needs to be screwed in on a flat surface such as drywall.


Pole or Rack Mount

The instructions are as follows:

  1. Start by attaching the sensor mounting straps through the holes in the bottom of the device.

  2. In order to mount the sensor, the strap will need to be wrapped around a sturdy surface (such as the leg of a rack, a rail or a pillar).

  3. Secure the mounting strap to ensure a strong hold. 


Powering the MT40

The MT40 has an input and an output for power to run through the device, shown in the image below:
IEC Input Output@4x.png

  1. Connect the output side to your device, using the necessary IEC C15 cable to your needed power termination. Some examples are
    1. C14 to C15 cable. Plugs into output of MT40 and into the input of IT devices like Cisco/Meraki products, PC's, computer monitors, etc.
    2. C14 to NEMA 5-15R cable. Plugs into output of MT40 and into the input of common electrical devices in North America
    3. When connecting the output power to the MT40, you have the option to use the included C15 connector sleeve to prevent the connector from accidentally being disconnected. 
  2. Connect the input side of the MT40 to an IEC C14 cable, once there is a secure connection on the cable then connect the wall socket side to a power source (this is your MA-PWR-CBL-XX)
    1. When connecting the input power to the MT40, you have the option to use the included C15 connector sleeve to prevent the connector from accidentally being disconnected.
  3. The light on the sensor should appear as green once booted and connected, this helps you know that it is connected and talking to the Meraki Dashboard.

Screenshot 2023-07-26 at 3.54.36 PM.png

Physical Lock Out Switch

On the MT40 sensor, there is a turnable switch which will allow the user to lock remote control of the downstream power. 

The lockout symbol can be seen in the image below:


Switch States:

  • Lock - Disables Remote power control through the Dashboard. Downstream power cannot be controlled when the switch is locked.
  • Unlock - Allows Remote power control through the Dashboard. Authorized Dashboard users(Organization or a Full Network Administrator) can issue commands to control downstream power.

The current switch state is also reflected in the dashboard UI under Power Controls tab


Enabled = Unlocked
Disabled = Lock

Default State

By default, MT40 downstream power state will always default to the last known command executed from the Dashboard.

For example, if a user turns off the Downstream Power of an MT40, the OFF state will persist after the reboot of the MT40 as well. This means that in case there’s an upstream power outage, the MT40 will keep the downstream state as OFF on power restore.

To override the state persistence in case Dashboard connectivity for sensor is not possible, a user can physically toggle the Lock Out switch.

LED Status

LED dual callout@4x (1).png

The LEDs on the MT40 has dual purpose:

Powered On

No LED = No Power Input
Rainbow = Initializing or Looking for Gateway
Solid 🟢 = Downstream Power Enabled
Solid 🟠 = Downstream Power Disabled

On Button Press

Rainbow then 🟢 = successful connection
Rainbow then 🟠 = unsuccessful connection

Support and Additional Information 

If issues are encountered with device installation or additional help is required, contact Meraki Support by logging in to and opening a case by visiting the Get Help section.

For additional information on Meraki hardware and for other installation guides, please refer to

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