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© 2016 Littelfuse Protection Relays & Controls Protection Relays Pump Controls and Liquid Level Controls www.littelfuse.com/ Rev: 1-A-062716 www.littelfuse.com/altxxx1sw-altxxx3sw Alternating Relay ALT -XXX- 1-SW / ALT -XXX-3-SW SERIES Wiring Diagram

Description

The ALT -xxx-1-SW/ALT -xxx-3-SW Series are used to alternate between two loads and are commonly used in duplex pump-up and pump-down applications to balance the runtime of both pumps. The ALT relays have a built-in debounce time delay that prevents the relay from changing state if the float momentarily bounces, and they have a built-in switch to manually force a specific load (pump) to operate each time the input float closes. This is helpful when performing periodic maintenance or pump repair. Must use the OT08PC socket for the 8-pin models, and the OT11PC socket for the 11-pin models, for UL Rating! *Note: Manufacturer’s recommended screw terminal torque for the OT Series Octal Sockets is 12 in.-lbs. Features & Benefits FEATURES BENEFITS Debounce time delay Prevents rapid cycling caused by waves or splashing in the tank LED indicators Visual indication of load operation in duplex application Built-in manual switch to force load operation Helpful to control load operation when performing periodic maintenance or pump repair ALT -xxx-3-SW offers duplexing Allows lag pump to energize if lead pump can’t handle current demand Accessories OT08PC 8-pin Octal Socket Octal Socket for plug-in units. 8-pin surface & DIN rail mountable. Rated for 10A @ 600VAC. OT11PC 11-pin Magnal Socket 11-pin surface & DIN rail mountable. Rated for 10A @ 300VAC TYPICAL WIRING DIAGRAM FOR ALT -XXX-1-SW TYPICAL WIRING DIAGRAM MODEL LINE VOTAGE MOUNTING DESCRIPTION ALT-100-1-SW 95-120VAC 11-pin magnal Single float input, two isolated Form C relays (DPDT), 2 LEDs for load indication ALT-100-3-SW 95-120VAC 8-pin octal Three float inputs (lead, lag, stop floats), actuating latching relays on lead/lag floats,

2 LEDs for load indication

ALT-200-3-SW 190-240VAC 8-pin octal Three float inputs (lead, lag, stop floats), actuating latching relays on lead/lag floats,

© 2016 Littelfuse Protection Relays & Controls Protection Relays Pump Controls and Liquid Level Controls www.littelfuse.com/altxxx1sw-altxxx3sw Rev: 1-A-062716 Specifications Input Characteristics Supply Voltage ALT-100-1-SW, ALT-100-3-SW 95-120VAC ALT-200-3-SW 190-240VAC Frequency 50/60Hz Functional Characteristics Debounce Time Delay ALT-100-1-SW, 1 second ALT-100-3-SW, ALT-200-3-SW 5 seconds Output Characteristics Output Relay (DPDT) Pilot Duty 480VA @ 240VAC General Purpose 10A @ 240VAC General Characteristics Temperature Range -40° to 70°C (-40° to 158°F) Maximum Input Power 5 W ALT -XXX- 1-SW / ALT -XXX-3-SW SERIES Standards Passed Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6kV contact, 8kV air Radio Frequency, Radiated 150MHz, 10V/m Fast Transient Burst IEC 61000-4-4, Level 3, 3.5kV input power and controls Safety Marks UL (OT08PC or OT11PC octal socket required) UL508 (File #E68520) CE IEC 60947-6-2 Dimensions H 44.45 mm (1.75”); W 60.33 mm (2.375”); D 104.78 mm (4.125”) (with socket) Mounting Method DIN rail or surface mount (plug into OT08PC or OT11PC socket) Sockets Available Model OT08PC UL Rating 600V Model OT11PC UL Rating 300V The sockets can be surface mounted or installed on DIN Rail.