ALT115-S-SW

**Protection Relays** Alternating Relays 

## ~~AL~~ T SER ~~IE~~ S 

## 8-pin Plug-in Alternating Relay 

## **Description** 

The ALT alternating relays are used to alternate between two loads. The ALT is commonly used in duplex pumping applications to balance the runtime of both pumps. 

The **ALT-S** is used in single high-level float applications. When the float switch opens, the alternating relay changes state, forcing the other pump to run the next time the float closes. All ALT relays have a built-in debounce feature that prevents the relay from changing state if the switch or float contact bounces momentarily. 

## **Wiring Diagram** 

## TYPICAL WIRING DIAGRAM FOR THE ALT-S 

The **ALT-X** has an internal cross-connected relay and is used in dual high-level float applications. These floats are commonly referred to as lead and lag floats. 

The pumps alternate as in the ALT-S version but the crossconnected relay configuration allows both pumps to run simultaneously when both the lead and lag floats are closed. 

These relays are also available with a built-in switch (SW option) that is used to manually force one of the pumps to run every time the float switch is closed. This is helpful when a pump has been removed for repair or for test purposes. In the case of the **ALT-X-SW,** the switch essentially forces one pump to be the lead pump, while still allowing the second to run when both floats are closed. 

## **Must use the OT08PC  socket for UL Rating!** 

TYPICAL WIRING DIAGRAM FOR  THE ALT-X (CROSS CONNECTED) 

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## **Accessories** 

## **OT08PC Octal 8-pin Socket** 

8-pin 35mm DIN rail or surface mount. Rated at 10A @ 600VAC. Surface mounted with two #6 screws or snaps onto a 35 mm DIN rail. 

*Note: Manufacturer’s recommended screw terminal torque for the RB Series and OT Series Octal Sockets is 12 in.-lbs. 

## **Features & Benefits** 

|FEATURES<br>**Debounce time delay**|BENEFITS<br>Prevents nuisance actuating causes by waves or<br>spashingin the tank|
|---|---|
|**Built-in manual/**|Force lead pump operation when a pump is removed|
|**auto switch**|for repair or testing(on select models)|



## **Ordering Information** 

|MODEL<br>ALT024-S|LINE VOLTAGE<br>20-26VAC or VDC|DESCRIPTION<br>For single high-level float applications|
|---|---|---|
|ALT024-S-SW<br>ALT115-S|20-26VAC or VDC<br>95-125VAC|For single high-level float applications<br>with built in manual switch<br>For single high-level float applications|
|ALT115-S-SW|95-125VAC|For single high-level float applications<br>with built in manual switch|
|ALT115-X<br>ALT115-X-SW<br>ALT230-S|95-125VAC<br>95-125VAC<br>195-250VAC|For dual high-level (lead and lag) float<br>applications<br>For dual high-level (lead and lag) float<br>applications with built in manual switch<br>For single high-level float applications|
|ALT230-S-SW|195-250VAC|For single high-level float applications<br>with built in manual switch|
|ALT230-X<br>ALT230-X-SW|195-250VAC<br>195-250VAC|For dual high-level (lead and lag) float<br>applications<br>For dual high-level (lead and lag) float<br>applications with built in manual switch|



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

Rev: 1-A-062116 

**Protection Relays** Alternating Relays 

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## ~~AL~~ T SER ~~IE~~ S 

## **Specifications** 

**Input Characteristics Supply Current** 40mA **Functional Characteristics Debounce Time Delay** 0.5 second **Control Input Impedance (min) 24** 10kΩ **115** 56kΩ **230** 100kΩ **Output Characteristics Output Contact Rating** 480VA @ 240VAC 

**General Characteristics Temperature Range** -40° to 50°C (-40° to 122°F) **Maximum Input Power** 5 W **Safety Marks UL (OT08PC octal socket required)** UL508 (File #E68520) **CSA** C22.2 No. 14 (File #46510) **Dimensions (with socket) H** 44.45 mm (1.75”); **W** 60.33 mm (2.375”); **D** 104.78 mm (4.125”) **Weight** 0.38 lb. (6.08 oz., 172.67 g) **Mounting Method** DIN rail or surface mount (plug into OT08PC socket) **Socket Available** OT08PC (UL Rating 600V) 

The 600V socket can be surface mounted or installed on DIN Rail. 

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

Rev: 1-A-062116