Littelfuse SCR430T, SCR Series, Obstruction Lamp Alarm Relay, Output Form SDPT, Incandescent Type, 120VAC
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The SCR series is a universal lamp alarm relay designed to sense the failure of flashing or steady incandescent beacon lamps or steady side lights. The toroidal current sensor provides isolation and allows monitoring of more than one line at a time. The SCR Series energizes when one or more lamps fail. It will monitor the operation of one to four side lights and up to four beacon lamps.
Operation
When a lamp fails, the SCR Series senses a decrease in current flow. After a fixed time delay, the LED glows and the two alarm outputs energize. The outputs and the LED are reset when the failed lamps are replaced and the current returns to the nominal setting, or when the input voltage is removed. The SCR will sense an open flasher, it will not sense a continuously ON flasher (see FB Series).
| Operation | |
| Lamp Monitoring |
Capacity (in lamps) 100W 116W 620W 700W SCR430T 120VAC Lamps 4 4 4 n/a |
| Time Delay | |
| Trip Delay | Factory fixed ≅ 6s |
| Input | |
| Input Voltage/Tolerance | ±10% |
| AC Line Frequency | 50/60Hz |
| Output | To operate a spare lamp or alarm |
| Line Voltage Output (Solid-state Rated) |
≤ 125W @ 120VAC ≤ 250W @ 240VAC |
| Isolated Alarm Output (SPDT) |
10A @ 240VAC or 30VDC resistive; 1/4 hp @ 125VAC; 1/2 hp @ 250VAC |
| Mechanical | |
| Mounting | Two #6 (M3.5 x 0.6) screws |
| Dimensions |
H 88.9 mm (3.5”); W 63.5 mm (2.5”); D 44.5 mm (1.75”) |
| Termination | Screws with captive clamps for up to 14 AWG (2.45 mm2 ) wire |
| Protection | |
| Circuitry | Encapsulated |
| Environmental | |
| Operating Temperature | -55° to 65°C |
| Weight | ≅ 6.8 oz (193 g) |