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White rectangular DIN-rail relay module with four channel indicators and terminal blocks

Shelly

Shelly Pro 4PM 4-Channel Smart Relay 16A 40A

SKU CH-BMTD-Q6W73

Four-channel smart relay with LAN, Wi-Fi and Bluetooth, 16 A per channel, 40 A total and built-in power metering

  • Parts2 Years
  • Precise power metering tracks real-time energy consumption
  • Four independent channels rated at 16 A each for flexible load control
  • Total device capacity of 40 A handles demanding circuits
  • LAN, Wi-Fi and Bluetooth connectivity with TLS 1.2 for secure local and cloud integration
  • mjS scripting support enables custom automation logic

Four-channel relay with metering

The Shelly Pro 4PM is a four-channel smart relay rated at 16A per channel and 40A total. It provides LAN, Wi-Fi and Bluetooth connectivity with TLS 1.2 security. Precise power metering tracks consumption for each circuit. The device suits residential, commercial and industrial automation where local and cloud control are required.

Replaces basic contactors without monitoring

It upgrades installations that rely on simple contactors or timers by adding real-time energy data, scripting and redundant network paths. The jump is worth it when you need per-channel consumption visibility, automated schedules or integration with energy meters for load shedding. Buyers who only need on/off switching without data will not benefit from the extra capability.

DIN-rail mount with screw terminals

The unit mounts on a standard DIN rail and connects via screw terminals for each channel. Configuration is handled through the companion app or web interface using Wi-Fi, LAN or Bluetooth. Common issues include exceeding the 16A per-channel limit, incorrect phase wiring on multi-phase loads and network isolation blocking local API access. Scripting errors can also cause unexpected relay behaviour.

Highlights

  • Precise power metering tracks real-time energy consumption
  • Four independent channels rated at 16 A each for flexible load control
  • Total device capacity of 40 A handles demanding circuits
  • LAN, Wi-Fi and Bluetooth connectivity with TLS 1.2 for secure local and cloud integration
  • mjS scripting support enables custom automation logic

Specifications

Parts2 Years

Questions about this item

What DIN-rail width does the 4-channel relay occupy for mounting?

The Shelly Pro 4PM is designed for standard DIN-rail installation inside an electrical enclosure; each of the four channels handles up to 16 A with a combined 40 A limit.

Which wiring step is most often missed when commissioning the LAN and Wi-Fi links?

Connect the Ethernet cable before powering the unit so the LAN interface obtains an IP address, then add the Wi-Fi credentials in the app; both interfaces can run simultaneously for redundancy.

How do I verify the internal power-metering accuracy after extended use?

The built-in meter reports real-time consumption per channel; compare its readings with a calibrated clamp meter on the load conductors to confirm ongoing precision.

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