SCR430T

**Flashers and Tower Lighting Controls** Tower and Obstruction Lighting Controls 

## ~~SC~~ R SE ~~RIE~~ S 

## 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 

## **Wiring Diagram** 

BEACON LAMP CONNECTION DIAGRAM 

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L1 N/L2<br>**----- End of picture text -----**<br>


V = Voltage B = Beacon Lamps SS = Selector Switch T = Toroid F = Flasher AXL = Auxiliary Load/Alarm 

Relay contacts are isolated. 

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). 

## **Features & Benefits** 

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|---|---|---|
|FEATURES|BENEFITS|
|Provides isolation from the lighting circuit and|
|Toroidal current sensing|allows monitoring of multiple lines simultaneously|
|Monitors 1-4 side|Senses failed incandescent flashing beacon or|
|lights or up to 4|
|beacon lamps|steady obstruction lamps|
|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|
|alarm output|
|BeCe|Fixed trip delay (6s)|Prevents nuisance alarms|
|Switch selectable|
|User selectable to meet wide application needs|
|number, voltage, and|
|wattage of lamps|with one relay|

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## OBSTRUCTION LAMP CONNECTION DIAGRAM 

L1 N/L2 

V = Voltage SS = Selector Switch T = Toroid AXL = Auxiliary Load/Alarm OL = Obstruction Lamps 

## **Ordering Information** 

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|---|---|---|
|MODEL|INPUT|LAMP TYPE|
|SCR430T|120VAC|Incandescent|
|SCR630T|230VAC|Incandescent|

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If you don’t find the part you need, call us for a custom product 800-843-8848 

Relay contacts are isolated. 

© 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/scr 

Rev: 1-A-062316 

**Flashers and Tower Lighting Controls** Tower and Obstruction Lighting Controls 

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## ~~SC~~ R SE ~~RIE~~ S 

## **Selection Range** 

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SCR430T SCR630T<br>a. 620 W 116 W 700 W 116 W<br>b. 120 V 130 V a.<br>4L 4L<br>3L 3L<br>c. c.<br>2L 2L<br>1L 1L<br>**----- End of picture text -----**<br>


- a. Lamp Wattage - Select the lamp wattage of the lamps in use. 

- b. Lamp Voltage - Select the lamp voltage shown on the lamp (SCR430T) 

- c. Lamps ON - Select the number of lamps on during normal operation. Only one lamp switch at a time may be transferred to the right. 

## **Programming Example** 

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1. 2. 

## **Specifications** 

**Operation Lamp Monitoring Capacity (in lamps) 100W 116W 620W 700W SCR430T   120VAC Lamps** 4 4 4 n/a **SCR630T   230VAC Lamps** n/a 4 n/a 4 **Time Delay Trip Delay** Factory fixed ≅ 6s **Input Input Voltage/Tolerance** SCR430T - 120VAC ±10% SCR630T - 230VAC ±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 mm[2] ) wire **Protection Circuitry** Encapsulated **Environmental Operating Temperature** -55° to 65°C **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 www.littelfuse.com/scr 

Rev: 1-A-062316