Does the S1 need a Ubisys gateway?

No. It is a Zigbee 3.0 certified device, so it joins the Zigbee radio on an EpiSensor Gateway, and Edge reads and switches it locally without the Ubisys gateway or app.

Why do power and energy not update?

The S1's metering clusters have no default reporting configuration. Reporting has to be configured, or the values polled, after pairing.

Does the load switch off during a firmware update?

No. The S1 keeps its output state through a reboot, including the one after a firmware update, which is why Ubisys says it can be used for critical loads.

What is the difference between the S1 and the S1-R?

The S1 is a flush-mount unit with one configurable input. The S1-R is the DIN rail version with two inputs. The switching rating is the same, and the meter sits on endpoint 3 on the S1 and endpoint 4 on the S1-R.

Ubisys S1 Zigbee in-wall power switch with metering

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 6 values from it, listed under Interface.

Connect it with

Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

The S1 is Ubisys' in-wall Zigbee power switch, sold as the Switching Actuator S1 (order code 1052). It switches a 230 V load of up to 16 A or 3680 VA through a bistable latching relay that switches in sync with the mains, and it fits a sufficiently deep DIN 49073 box behind a socket, a light switch or a ceiling outlet. The rail-mounted S1-R is its DIN rail sibling.^1, 2

Power: Mains. 230 V~ from the switched circuit, with 0.3 W dissipation. For bench commissioning it also runs from 12 to 48 V DC, with the radio working and the input and output disabled.¹
Output: 230 V~, 50 Hz, 16 A maximum, 3680 VA²
Relay: Bistable latching relay, mains-synchronised switching¹
Inputs: One configurable 230 V~ input¹
Metering: Energy delivered and received, power, RMS voltage and current, power factor, frequency¹
Own dissipation: 0.3 W¹
Radio: TI CC2520, 5 dBm transmit, -98 dBm receiver sensitivity¹
Channels: 2.4 GHz, channels 11 to 26¹
Zigbee role: Zigbee 3.0 certified router¹
Mounting: Flush mount in a DIN 49073 box²
Housing: Flame retardant V-0, black RAL 9005¹
Order code: 1052 (S1); 1151 for the S1-R rail version¹
Zigbee model identifier: S1 (5501)¹

Where it is used

Switching and metering individual electric heaters, fans or small HVAC loads up to 16 A behind an existing wall switch.
HVAC energy monitoring for commercial buildings
Scheduling an immersion or small water heater outside peak periods, with its energy measured.
Electric boiler demand response
Metering a comms cabinet or server feed where the relay must hold its state through a firmware update.

Interface

On the Zigbee network it joins as a router and extends the mesh for other devices.¹

Readings and settings, with units and ranges where Ubisys publishes them. readable, readable and writable, writable only.³

Download

Reading	Unit	Range or values	Access
Measurements 2
PowerInstantaneous demand of the load.	W	-	Read only
EnergyEnergy delivered to the load.	kWh	-	Read only
Controls 1
RelaySwitches the output.	-	`ONOFFTOGGLE`	Read and write
Settings 1
Power-on behaviourOutput state when mains returns.	-	`offontoggleprevious`	Read and write
Diagnostics 2
Input actionCommands from the wired input on endpoint 2, including level and colour commands when the input is reconfigured.	-	`on_2off_2toggle_2brightness_move_up_2brightness_move_down_2brightness_stop_2`	Read only
IdentifyMakes the switch identify itself.	-	`identify`	Write only

The output relay is on endpoint 1, the wired input's switch commands on endpoint 2 and the meter on endpoint 3. On the S1-R the meter moves to endpoint 4.¹

The metering and electrical measurement clusters start with no reporting configured. The Zigbee2MQTT definition sets up instantaneous demand reporting and polls the energy total, and a new integration has to do one or the other.^1, 4

The input can be reconfigured through Ubisys' device setup cluster, for example for a toggle switch instead of a push-button, or decoupled from the output so a press only sends an action.^1, 3

Setup

Open pairing in Edge first
Open pairing on the Gateway's Zigbee network in Edge. The S1 looks for an open network as soon as it is first powered.¹
Power it up
Apply power. The LED blinks quickly while it searches. Five slow blinks mean it has joined; three quick blinks mean the attempt failed, and it keeps searching.¹
Reset it if it was paired before
Hold the push-button behind the small hole in the front for about 10 seconds until the LED starts to flash. Without access to the button, power it for at least 4 seconds, then give it three short power cycles of 0.5 to 2 seconds with at least 1 second off between them, and leave it on.¹
Set up reporting
The meter has no default reporting. Check in Edge that power updates when the load changes and that the energy total advances, before you build anything on them.¹
Check one reading
Switch a known load from Edge and from the wired switch, and compare power with the load's rating.

Common questions

Does the S1 need a Ubisys gateway?: No. It is a Zigbee 3.0 certified device, so it joins the Zigbee radio on an EpiSensor Gateway, and Edge reads and switches it locally without the Ubisys gateway or app.¹
Why do power and energy not update?: The S1's metering clusters have no default reporting configuration. Reporting has to be configured, or the values polled, after pairing.¹
Does the load switch off during a firmware update?: No. The S1 keeps its output state through a reboot, including the one after a firmware update, which is why Ubisys says it can be used for critical loads.¹
What is the difference between the S1 and the S1-R?: The S1 is a flush-mount unit with one configurable input. The S1-R is the DIN rail version with two inputs. The switching rating is the same, and the meter sits on endpoint 3 on the S1 and endpoint 4 on the S1-R.¹