FB Series - Universal Lamp Alarm Relay

Series: FB Questions? Contact Littelfuse Support
Littelfuse Tower and Obstruction Lighting Controls
The FB9L is a universal lamp alarm relay designed to sense the failure of flashing LED beacon lamps. It will monitor the operation of one to eight beacons connected to a single flasher and/or auxiliary modules and the operation of the flasher. The FB9L output relay energizes when one or more lamps fail. All monitored lamps must be the same wattage and voltage. The 0.5A solid-state output energizes when a flasher failure is sensed.

Operation
When a LED beacon lamp fails, the FB9L senses a decrease in current flow. After a 10s lamp failure trip delay, the isolated SPDT (4-5-6) and non-isolated SPNO (3-1) relay contacts energize. These contacts are used to indicate a beacon failure has occurred. The “L” onboard LED indicator flashes green during the trip delay and glows red after the output relay energizes. Connected to a site monitoring system, it provides remote beacon monitoring required by FAA-AC No: 150/5345-43E.

The FB9L also monitors the operation of the flasher. If the flasher remains in the ON or OFF condition for more than 6s the solidstate output energizes and the “F“ flasher failure, onboard LED glows red. This output is normally used to energize an external flasher bypass relay. The contacts of the bypass relay are used to route voltage around the failed flasher and to indicate an alarm condition.

Note: In a single flasher, single beacon system, if the beacon lamp fails, zero current flow is detected. This will cause the flasher failure output to energize after 6s and then the beacon failure outputs after 10s. This is normal operation and can be expected anytime zero current is flowing through the monitored conductor.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output
Form
Trip Delay RangeOutput Load Rating (VA)Sample capable
FB9L120 - 230VAC3 total - 2 relay 1 solid stateFlasher failure: Fixed at 6s; -0/+40; Lamp failure: Fixed at 10s; -0/+40%One isolated SPNO relay rated 5A @ 240VAC or 30VDC resistive 1/4hp @125VAC 1/2hp @ 250VAC; One SPDT relay rated at 10A @ 240VAC or 30VDC resistive 1/4hp @125VAC 1/2hp @ 250VAC; One solid-state line voltage output rated 0.5A steady 5A inrushNo