Power Fail Monitor

*** The PFM is being redesigned and this version is currently out of stock. ***
The new version of the PFM features a smaller form factor, can be used in both domestic and international applications, and will be ready to ship in November 2019.

Contact RLE directly at sales@rletech.com to reserve your PFM and receive it from our first available shipment.

The RLE Power Fail Monitor (PFM) is a convenient power failure sensor that detects the loss of utility power.

The PFM provides early warning that power has been lost and that reserve power needs to be activated. On loss of power, the unit sends a signal via its Form C output relay.

The PFM is available in both domestic and international configurations:

  • Domestic PFM

    – This unit plugs directly into a standard (USA) 120V power outlet and screws securely into the outlet to ensure that it is not accidentally disconnected.

  • International PFM-I

    – The PFM-I accepts 230VAC/220VDC power. The electronics are housed in a NEMA 1 junction box. The enclosure’s lid screws on securely to protect the components and connections.

Both units integrate easily with existing alarm monitoring systems, including RLE’s Falcon monitoring products.

Key Features

  • Provides early warning of power loss
  • Plugs into any standard (USA) 120V outlet
  • Provides Form C output relay upon loss of power
  • Cost-effective, reliable power fail monitor


Power Fail Monitor – Domestic (PFM)

Power: 120VAC @ 15mA

Relay Output: 1 Dry Contact, Form C; 10A @ 120VAC; 5A @ 30VDC)

Operating Environment

  • Temperature: 32°F to 122°F (0°C to 50°C)
  • Humidity: 5% to 95% RH, non-condensing
  • Altitude: 15,000ft (4,572m) max.

Storage Environment: -4°F to 158°F (-20°C to 70°C)

Dimensions: 2.375″W x 3.5″H x 2.25″D (60mmW x 89mmH x 57mmD)

Weight: 0.21 lbs. (0.01kg)


Power Fail Monitor – International (PFM-I)

Power: 230VAC/220VDC @ 50Hz

Relay Output: 1 Dry Contact, Form C; 250VAC/VDC @ 6A max.; 12V @ 10mA min.; DPDT

Operating Environment: -40°F to 131°F (-40°C to 55°C)

Storage Environment: -40°F to 185°F (-40°C to 85°C)

Dimensions: 6″W x 6″H x 4″D (152mmW x 152mmH x 102mmD)

Weight: 3.2 lbs. (1.45kg)

Product Documentation Links

Technical Resources