Protection Relays
Alternating Relays
ARP SERIES
Alternating Relay
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.
8-PIN
11-PIN
Wiring Diagram
SPDT 8-PIN
L1
N/L2
DPDT 11-PIN
L1
N/L2
DPDT 8-PIN CROSS-WIRED
L1
N/L2
Relay contacts in above are isolated.
Features & Benefits
V = VOLTAGE
LA = LOAD A
LB = LOAD B
S1 = PRIMARY CONTROL SWITCH
S2 = LAG LOAD SWITCH
FEATURES
Alternating or
electrically locked
operation
Low profile
selector switch
LED status indication
Industry standard
base connection
BENEFITS
Flexibility to run unit alternating between the two
loads as normal or lock the relay to one specific load.
Prevents accidental actuation
Visual indication of which load is engaged
Flexibility to use in many applications
Ordering Information
MODEL
LINE
VOLTAGE
OUTPUT
FORM
DESCRIPTION
AR120A-3095 120VAC
ARP23S
ARP41
ARP41S
ARP42S
ARP43
ARP43S
ARP61S
ARP62S
ARP63S
24VAC
120VAC
120VAC
120VAC
120VAC
120VAC
230VAC
230VAC
230VAC
SPDT
DPDT
SPDT
SPDT
DPDT
DPDT
DPDT
SPDT
DPDT
DPDT
8-pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.
8-pin cross-wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.
8-pin for alternating applications.
8-pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.
11-pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.
8-pin cross-wired for duplexing applications.
8-pin cross-wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.
8-pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.
11-pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load.
8-pin cross-wired for duplexing applications. Rotary switch allows user to lock internal relay to one specific load.
Rev: 1-A-060216
1-A-101118
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2018 Littelfuse Protection Relays & Controls
www.littelfuse.com/arp
www.littelfuse.com/
Protection Relays
Alternating Relays
ARP SERIES
Accessories
BZ1 Front Panel Mount Kit
Provides an easy method of through-the-panel
mounting of 8- or 11-pin plug-in timers, flashers,
and other controls.
NDS-8 Octal 8-pin Socket
8-pin 35mm DIN rail or surface mount. Rated
at 10A @ 300VAC. Surface mounted with two
#6 (M 3.5 x 0.6) screws or snaps onto a 35 mm
DIN rail. Uses PSC8 hold-down clips.
NDS-11 11-pin Socket
1-pin 35mm DIN rail or surface mount. Rated
at 10A @ 300VAC. Surface mounted with two
#6 (M 3.5 x 0.6) screws or snaps onto a 35 mm
DIN rail. Uses PSC11 hold-down clips.
PSC8 or PSC11 Hold-down Clips
Securely mounts plug-in controls in any position.
Provides protection against vibration. Use PSC8
with NDS-8 Octal Socket or PSC11 with NDS-11
Socket. Sold in pairs.
C103PM (AL) DIN Rail
35 mm aluminum DIN rail available in a 36 in.
(91.4 cm) length.
Specifications
Input
Tolerance
24VAC
120 & 230VAC
AC Line Frequency
Output
Type
Form
Rating
Maximum Voltage
Life
Protection
Isolation Voltage
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Weight
-15% to 20%
-20% to 10%
50/60Hz
Electromechanical relay
SPDT, DPDT, or cross-wired DPDT
10A resistive @ 120/240VAC & 28 VDC;
1/3 hp @ 120/240VAC
250VAC
Mechanical - 1 x 10
7
; Electrical - 1 x 10
6
≥ 1500V RMS input to output
Plug-in socket
H
60.7 mm (2.39”);
W
45.2 mm (1.78”);
D
81.3 mm (3.2”)
Octal 8-pin or magnal 11-pin
-20° to 60°C / -30° to 85°C
5.6 oz (159 g) approx.
NOTE: Unit does not have debounce time delay.
Disclaimer Notice –
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products
are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at
www.littelfuse.com/product-disclaimer.
© 2018 Littelfuse Protection Relays & Controls
www.littelfuse.com/arp
www.littelfuse.com/
Rev: 1-A-060216
1-A-101118
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