Littelfuse SCR9L Series, Universal Lamp Alarm Relay, Output Form SPDT, 120-230VAC
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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.
Operation
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.
Specifications
| Sensors | |
| Calibration Range (total all Lamps) | 150mA - 8.0A |
| Absolute Max Current (total all Lamps) | 15A max. (may not calibrate above 8A) |
| Single Lamp Current | 150mA - 8.0A (total all lamps < 8.0A) |
| Time Delay | |
| Trip Delay | Factory fixed ≅10s |
| Input | |
| Input Voltage/Tolerance | 120 to 230VAC ±15% |
| AC Line Frequency | 50/60Hz |
| Output | To operate a spare lamp or alarm |
| Line Voltage Output (SPNO) |
5A @ 240VAC or 30VDC resistive; 1/4 hp @ 125VAC; 1/2 hp @ 250VAC |
| Isolated Alarm Output (SPDT) |
10A @ 240VAC or 30VDC resistive; 1/4 hp @ 125VAC; 1/2 hp @ 250VAC |
| Auxilliary Input Voltage (H) | ≤ 2A @ 230VAC |
| Mechanical | |
| Mounting | One #10 (M5 x 0.8) screw |
| Dimensions |
H 76.7 mm (3”); W 51.3 mm (2.02”); D 41.7 mm (1.64”) |
| Termination | IP20 screw terminals for up to 14 AWG (2.45 mm2 ) wire or two 16 AWG (1.3 mm2 ) wires |
| Protection | |
| Circuitry | Encapsulated |
| Environmental | |
| Operating / Storage Temperature | -40° to 60°C / - 40° to 85°C |
| Weight | ≅ 3.9 oz (111 g) |