PWR-AC-FAILAC Power Failure Sensor
know the moment utility power fails
for edge infrastructure
Detects the outage the moment it happens — before the UPS runs out.
Senses the mains upstream of your UPS via the included adapter.
ON/OFF status with immediate alerts via email, SNMP traps & optional SMS.
Trigger safe server shutdowns on a detected outage.
Autoswitching 90-240 VAC adapter — EU, UK or US plug styles.
Steel industrial enclosure — 0U rack, DIN rail, magnetic or wall mount.
BMS ready via Modbus TCP, BACnet IP & Modbus RTU.
SNMP for NMS/DCIM & MQTT for IIoT.
Senses the mains upstream of your UPS via the included adapter.
ON/OFF status with immediate alerts via email, SNMP traps & optional SMS.
Trigger safe server shutdowns on a detected outage.
Autoswitching 90-240 VAC adapter — EU, UK or US plug styles.
Steel industrial enclosure — 0U rack, DIN rail, magnetic or wall mount.
BMS ready via Modbus TCP, BACnet IP & Modbus RTU.
SNMP for NMS/DCIM & MQTT for IIoT.
How it works — the essentials:
Sense point: the mains, upstream of the UPS
Requirement: base unit & sensor on UPS power
Output: ON/OFF status on the base unit
How It Works
The included adapter watches the mains upstream of the UPS; the UPS-backed sensor and base unit stay alive to tell you the power died.
Why the UPS Alone Isn't Enough
Most popular UPS systems have no management or alerting. Without a sensor, the first notice of an outage is the equipment going dark.
Safe Server Shutdown
Free Perl and PowerShell scripts read the sensor and gracefully shut down Linux and Windows servers before the UPS runs dry.
Monitoring DC Power?
For -48V telecom plants, battery banks and 12-80 VDC systems, the DC voltage & failure sensor measures the bus and alarms on failure.
Built for Edge & Unmanned Sites
Server rooms, cell sites and remote telecom rooms — where nobody is present to notice the outage and the UPS clock is already running.
Alerting & Integration
ON/OFF status with immediate alerts via email, SNMP traps & optional SMS — straight into your BMS over Modbus TCP, BACnet IP or Modbus RTU.
RS-485 Model
For OEMs and large accounts: an RS-485 Modbus RTU version integrates directly with your own gateway or controllers.
How-To Video
A 2 minute guided tour of the power failure sensor: how it connects, how it detects an outage and how the alerting is configured.
Technical Specifications
Full adapter, environmental, physical and connectivity specifications for the PWR-AC-FAIL.
How It Works
The trick is in what senses what:
- The included adapter plugs into the mains — the utility feed upstream of the UPS. As long as utility power is present, the adapter feeds the sensor a signal.
- The sensor and base unit run on UPS power, so when the mains fail, they stay alive — and the missing signal is the outage detection.
- The status flips to OFF and the base unit fires its alerts immediately, while the UPS carries the load.
- When utility power returns, the status returns to ON — so you also know when the outage ended.
RS485 (Modbus RTU) version
Looking to integrate this sensor with your own gateway or industrial control system? For large accounts customers or OEMs we now do offer a RS-485 version of this sensor. It has the same specs as the normal sensor. However rather than talking to our base unit and then communicate over industrial protocols with 3rd party systems, this version allows for native integration bypassing our base units.
It offers the same features as our regular sensors but with following differences:
- RS485 Modbus RTU output
- individually addressable using dial switch
- 256 addresses available
- 12-24v DC input
Contact us for pricing & more info
It offers the same features as our regular sensors but with following differences:
- RS485 Modbus RTU output
- individually addressable using dial switch
- 256 addresses available
- 12-24v DC input
Contact us for pricing & more info