Flashers and Tower Lighting Controls Tower and Obstruction Lighting Controls SCR SERIES Universal Lamp Alarm Relay (SCR430T only) Description 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 ofl w. 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 Wiring Diagram will sense an open flasher, it will not sense a continuously ON asher (see FB Series).fl BEACON LAMP CONNECTION DIAGRAM L1 N/L2 Features & Benefits FEATURES BENEFITS V = Voltage B = Beacon Lamps Provides isolation from the lighting circuit and Toroidal current sensing allows monitoring of multiple lines simultaneously SS = Selector Switch T = Toroid Monitors 1-4 side Senses failed incandescent flashing beacon or F = Flasher lights or up to 4 steady obstruction lamps beacon lamps AXL = Auxiliary Load/Alarm Isolated, 10A, SPDT alarm output plus one 1A, Provides alarm indication and can also be used for solid-state line voltage remote monitoring of the lighting system Relay contacts alarm output are isolated. Fixed trip delay (6s) Prevents nuisance alarms Switch selectable User selectable to meet wide application needs number, voltage, and with one relay wattage of lamps OBSTRUCTION LAMP CONNECTION DIAGRAM L1 N/L2 Ordering Information V = Voltage MODEL INPUT LAMP TYPE SS = Selector Switch T = Toroid SCR430T 120VAC Incandescent AXL = Auxiliary Load/Alarm SCR630T 230VAC Incandescent OL = Obstruction If you dont find the part you need, call us for a custom product 800-843-8848 Lamps Relay contacts are isolated. 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062316 www.littelfuse.com/scrFlashers and Tower Lighting Controls Tower and Obstruction Lighting Controls SCR SERIES Selection Range Specifications Operation SCR430T SCR630T Lamp Monitoring a. 620 W 116 W 116 W 700 W a. Capacity (in lamps) 100W 116W 620W 700W b. 120 V SCR430T130 V SCR630T SCR430T 120VAC Lamps 4 4 4 n/a 4L 4L a. 620 W 116 W 116 W 700 W SCR630T 230VAC Lamps n/a 4 n/a 4 a. 3L 3L b. 120 V 130 V c. c. Time Delay 2L 2L 4L 4L Trip Delay Factory fixed 6s 1L 1L 3L 3L c. c. Input 2L 2L Input Voltage/Tolerance SCR430T - 120VAC 10% 1L 1L a. Lamp Wattage - Select the lamp wattage of the lamps in use. SCR630T - 230VAC 10% b. Lamp Voltage - Select the lamp voltage shown on the lamp AC Line Frequency 50/60Hz (SCR430T) Output To operate a spare lamp or alarm c. Lamps ON - Select the number of lamps on during normal Line Voltage Output operation. Only one lamp switch at a time may be transferred (Solid-state Rated) 125W 120VAC to the right. 250W 240VAC Isolated Alarm Output (SPDT) 10A 240VAC or 30VDC resistive 1/4 hp 125VAC 1/2 hp 250VAC Programming Example Mechanical Mounting Two 6 (M3.5 x 0.6) screws 1. Dimensions H 88.9 mm (3.5) W 63.5 mm (2.5) D 44.5 mm (1.75) 1. Termination Screws with captive clamps for up to 14 AWG 2 (2.45 mm ) wire 2. Protection Circuitry Encapsulated 2. Environmental Operating Temperature -55 to 65C Weight 6.8 oz (193 g) Example Shown: SCR430T-620 watts at 120 VAC lamps, two lamps are ON during normal operation. STEP 1. Select lamp wattage: 116 or 620 watts 2. Select the number of lamps ON (1 thru 4) during normal operation. Only one lamp switch may be ON (RIGHT) at any time. 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062316 www.littelfuse.com/scr