© 2016 Littelfuse Protection Relays & Controls

Protection Relays

Alternating Relays

www.littelfuse.com/

Rev: 1-A-062116

www.littelfuse.com/arp

Description

The ARP Series is used in systems where equal run time for

two motors is desirable. The selector switch allows selection

of alternation or for continuous operation of either load. LED’s

indicate the status of the output relay. This versatile series may

be front panel mounted (BZ1 accessory required) or 35 mm DIN

rail mounted with an accessory socket.

Operation

Alternating: When the rotary switch is in the “alternate”

position, alternating operation of Load A and Load B occurs upon

the opening of the control switch S1. To terminate alternating

operation and cause only the selected load to operate, rotate

the switch to position “A” to lock Load A or position “B” to lock

Load B. The LEDs indicate the status of the internal relay and

which load is selected to operate.

Note: Input voltage must be applied at all times for proper

alternation. The use of a solid-state control switch for S1 may

not initiate alternation correctly. S1 voltage must be from

the same supply as the unit’s input voltage (see connection

diagrams). Loss of input voltage resets the unit; Load A

becomes the lead load for the next operation.

Duplexing (Cross Wired): Duplexing models operate the same

as alternating relays and when both the Control (S1) and Lag

Load (S2) Switches are closed, Load A and Load B energize

simultaneously.

The DPDT 8-pin, cross-wired option, allows extra system load

capacity through simultaneous operation of both motors when

needed. Relay contacts are not isolated.

Features & Benefits

FEATURES

BENEFITS

Alternating or

electrically locked

operation

Flexibility to run unit alternating between the two

loads as normal or lock the relay to one specific load.

Low profile

selector switch

Prevents accidental actuation

LED status indication

Visual indication of which load is engaged

Industry standard

base connection

Flexibility to use in many applications

ARP SERIES

Alternating Relay

Wiring Diagram

L1

N/L2

L1

N/L2

L1

N/L2

V = VOLTAGE

LA = LOAD A

LB = LOAD B

S1 = PRIMARY CONTROL SWITCH

S2 = LAG LOAD SWITCH

Relay contacts in above are isolated.

SPDT 8-PIN

DPDT 11-PIN

DPDT 8-PIN CROSS WIRED

Ordering Information

MODEL

LINE

VOLTAGE

OUTPUT

FORM

DESCRIPTION

AR120A-3095 120VAC

SPDT

8 pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.

ARP23S

24VAC

DPDT

8 pin cross wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.

ARP41

120VAC

SPDT

8 pin for alternating applications.

ARP41S

120VAC

SPDT

8 pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.

ARP42S

120VAC

DPDT

11 pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.

ARP43

120VAC

DPDT

8 pin cross wired for duplexing applications.

ARP43S

120VAC

DPDT

8 pin cross wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.

ARP61S

230VAC

SPDT

8 pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.

ARP62S

230VAC

DPDT

8 pin cross wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.

ARP63S

230VAC

DPDT

8 pin cross wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.

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

8-PIN

11-PIN