SCR9L Series - Obstruction Lamp Alarm Relay

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The SCR9L is a universal lamp alarm relay designed to sense the failure of flashing or steady LED beacon lamps or obstruction lamps. The SCR9L energizes when one or more lamps fail. It will monitor the operation of one to eight beacon or obstruction lamps. All monitored lamps must be the same wattage and voltage. When connected to a site monitoring system, it provides the remote lamp monitoring protection required by the FAA-AC No: 150/5345-43E.

When a lamp fails, the SCR9L senses a decrease in current flow. After a 10s trip delay, the onboard LED glows and the two alarm outputs energize. The outputs and the LED are reset when the failed lamps are replaced and the unit is recalibrated. The SCR9L will sense an open flasher, it will not sense a continuously ON flasher (see FB Series). Removing input voltage de-energizes the output and the LED‘s. It does not change the calibration.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Trip Delay TypeOutput Load Rating (VA)DimensionsStockSamples
SCR9L120 - 230 V acLine Voltage Output: SPNO; Isolated Alarm Output: SPDT≅10 fixedLine Voltage Output (SPNO): 5 A @ 240 Vac or 30 Vdc resistive - 1/4 hp @ 125 Vac - 1/2 hp @ 250 Vac; Isolated Alarm Output (SPDT): 10 A @ 240 Vac or 30 Vdc resistive - 1/4 hp @ 125 Vac - 1/2 hp @ 250 Vac3 H x 2 W in. (76.7 x 51.3 mm)CheckOrder
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