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  • New item   Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay
    New item   Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay 1
    New item   Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay 2
    New item   Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay 3

    Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay

    Code: SPM-4Relay
    Barcode: 6920075776980
    Inquire about this item
    Price 74.80 € VAT incl.
    ( 61.82 € VAT excl. )

    SONOFF SPM-4Relay is a 4-channel expansion module with energy metering and a relay for each line (20 A per channel, 80 A total). It mounts on a DIN rail, connects to SPM-Main via RS-485, and data and control are in the eWeLink app.

  • Product description

    Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay

    SONOFF SPM-4Relay is a four-channel expansion module with energy metering for each channel, mounted on a DIN rail. It connects to SONOFF SPM-Main and lets you meter and control four lines of up to 20 A in the panel.

    Key idea:
    This is a panel-level energy metering system: each line is metered and controlled separately, and SPM-Main collects the data and sends it to the app. The module works only together with SPM-Main.
    Channels
    4 with metering
    Load
    20 A per channel / 80 A total
    Connectivity
    RS-485 to SPM-Main
    Mounting
    DIN rail

    How it works

    Each of the four lines is connected via the module relay and metering circuit: voltage, current, power and consumed energy are measured, and the line can be switched on or off remotely.

    The module connects to SPM-Main over an RS-485 bus; SPM-Main sends the data to the eWeLink app via Wi-Fi or Ethernet and stores the history.

    Several SPM-4Relay modules can be connected to one SPM-Main, so dozens of panel lines can be metered.

    Why choose SPM-4Relay?
    Instead of separate meters and relays for each line – one modular solution that shows where energy goes and lets you switch off unnecessary loads remotely.

    Technical specifications

    Product type 4-channel DIN expansion module with energy metering and relays for the SPM system
    Manufacturer / model SONOFF SPM-4Relay
    Number of channels 4
    Supply voltage 100–240 V AC, 50/60 Hz
    Max. current per channel 20 A
    Max. total current 80 A
    Measured values voltage, current, power, consumed energy
    Communication RS-485 to SPM-Main (Wi-Fi / Ethernet via SPM-Main)
    Compatibility SONOFF SPM-Main only
    App eWeLink
    Housing PC V0
    Operating temperature -10 °C … +40 °C
    Operating humidity 5–95 % RH, non-condensing
    Mounting DIN rail

    Main functions

    • Metering per line – power, current, voltage and energy separately.
    • Remote line control – each line is switched on or off from the app.
    • Consumption history – daily, monthly and yearly statistics via SPM-Main.
    • Software overload protection – the line is switched off when a set limit is exceeded.
    • Expandable system – several modules on one SPM-Main.
    • Schedules and scenes – lines are controlled by time or conditions.

    Where is it used?

    • Home distribution panels
    • Office and commercial panels
    • Rental premises and apartments
    • Server and technical rooms
    • Production and warehouse lines
    • Solar power consumption monitoring

    Use by need

    For homeowners.
    You see how much energy heating, the kitchen or the boiler uses and can control them remotely.
    For electricians.
    A modular DIN solution without separate meters – less equipment and wiring in the panel.
    For energy managers.
    Line-level data helps allocate costs to tenants and find savings.

    Practical use

    If you want to know how much energy the air conditioners, kitchen and lighting use in an office, SPM-Main and SPM-4Relay are installed in the panel, each line is connected through a separate channel, and their consumption and control are visible in the app.

    Pros

    • Metering and control for each line
    • Up to 20 A per channel
    • Modular DIN mounting
    • Expandable system
    • Consumption history in the app

    Cons / limitations

    • Works only with SPM-Main
    • Takes a lot of panel space
    • Does not replace circuit breakers
    • Panel installation by a qualified electrician only

    Safety and installation notes

    • Switch off the main supply and check for voltage before installation
    • Installation must be done by a qualified electrician
    • Protect each line with an appropriate circuit breaker
    • Do not exceed 20 A per channel and 80 A total
    • Observe the cable cross-section and terminal tightening requirements

    Quick selection guide

    4 channels
    20 A per channel
    80 A total
    Energy metering
    RS-485 to SPM-Main
    DIN rail
    Suitable when you need:
    • meter the consumption of each panel line
    • control lines remotely
    • expand the SPM metering system
    Check before use:
    • whether you have or plan SPM-Main
    • DIN rail space in the panel
    • the current of each line
    • the RS-485 cable length to SPM-Main
    Important reminder: SPM-4Relay is not a protective device – each line must be protected by a circuit breaker, and by an RCD in damp areas.

    FAQ

    Does it work without SPM-Main?
    No, SPM-4Relay connects only to SONOFF SPM-Main, which manages communication and data.
    How many modules can be connected?
    Several modules connect to one SPM-Main, so dozens of lines can be metered.
    What is the load per channel?
    Up to 20 A per channel and up to 80 A for all together.
    Can a line be switched off remotely?
    Yes, each channel has a relay and is controlled from the app.
    Where is the data stored?
    SPM-Main collects the data and sends it to the eWeLink app.
    Is it suitable for a three-phase system?
    Each channel meters a single-phase line; the phases of a three-phase system are metered on separate channels.

    Modular | smart remote switch | 4-channel expansion module | with energy metering | 80A | 100-240V | DIN | Wi-Fi | SONOFF | SPM-4Relay

    SONOFF SPM-4Relay is a 4-channel DIN expansion module with energy metering and relays: up to 20 A per channel and 80 A total, control and statistics via SPM-Main and eWeLink.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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