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Marsh Bellofram Diversified Electronics Division ARA-Series Special Function Alternating Relay

Marsh Bellofram Diversified Electronics Division ARA-Series Special Function Alternating Relay

Product catalog summary

Overview: The ARA-120-AHE is a special function Triplexor designed for installations with three loads. It features a field selection switch to omit one load for maintenance while duplexing the remaining two. It can alternate loads on each cycle or via external clocking, and allows additional loads to run if needed.

Operation: Alternating action is initiated by a control switch between terminals 2 and 4 with a factory-installed jumper between terminals 3 and 4. For external initiation, remove the jumper and use an isolated switch between terminals 2 and 3. The selection switch positions include Normal (Triplexor operation), Omit 1 (duplex loads 2 and 3), Omit 2 (duplex loads 1 and 3), and Omit 3 (duplex loads 1 and 2). In power failure, the relay returns to its quiescent state.

Specifications:

Control Voltage: 120 VAC ±10%, 50/60 Hz
Control Switch Current: 2 mA
Power Required: 3 VA
Duty Cycle: Continuous
Output Rating: Triplexor (3) 5 Amp Resistive, 1/6 hp, 211 VA @ 120 VAC, Inductive
Life Expectancy: Mechanical - 10,000,000 operations; Electrical - 100,000 operations at rated load
Indicators: LEDs show output conditions
Temperature Ratings: Operate -4° to 131°F (-20° to +55°C); Storage -40° to 185°F (-40° to +85°C)
Enclosure: Style “E” Lexan® Surface Mounted
Terminations: (12) #8-32 Screw Terminals
Weight: 16 oz.

Recommendations: When using the “omit load” option, ensure the H-O-A switch is in the “off” position for the omitted load to prevent potential issues.

Ordering Information: Model Number: ARA-120-AHE, includes “Load Omit” switch.

Catalog excerpts

Marsh Bellofram Diversified Electronics Division ARA-Series Special Function Alternating Relay-1

800.727.5646 atcdiversified.com Diversified Electronics ARA Series 253 Spec i a l F u n ct i o n A l t e r n a t i n g R e l a y The ARA-120-AHE is a special function Triplexor designed for three load installations. This model has a field selection switch that is used to omit one of the three loads for general or emergency maintenance while duplexing the remaining two loads. The ARA-120-AHE has the option of alternating on each load cycle or by external clocking. This alternating relay also allows for additional loads to run in the event of excess load requirements. The alternating action is initiated by the control switch between terminals 2 and 4 when the factory installed jumper is in place between terminals 3 and 4. The alternating action may be initiated externally by removing the factory installed jumper between terminals 3 and 4 and placing an isolated normally open switch between terminals 2 and 3. An alternating action will occur each time this isolated switch is closed and then re-opened. The selection switch has the following positions: Normal — Normal operation as Triplexor Omit 1 — Omit load #1 Duplex loads 2 and 3 Omit 2 — Omit load #2 Duplex loads 1 and 3 Omit 3 — Omit load #3 Duplex loads 1 and 2 In the event of a power failure, the Alternating Relay will return to its quiescent state and continue sequencing loads on one-at-a-time. NOTE: When the “omit load” option is selected, full potential will appear on the output terminal of the omitted load when the lag switch between terminals 2 and 5 closes. It is recommended that the H-O-A switch be placed in the “off” position for the omitted load. Alternating Relays & Controllers // ARA Series \\\OPERATION \\\DIMENSIONS (INCHES) \\\SPECIFICATIONS CONTROL VOLTAGE 120 VAC ±10%, 50/60 Hz CONTROL SWITCH CURRENT 2 mA POWER REQUIRED 3 VA (Approximately) DUTY CYCLE Continuous OUTPUT RATING Triplexor (3) 5 Amp Resistive, 1/6 hp, 211 VA @ 120 VAC, Inductive Externally Switched to terminal #2 LIFE EXPECTANCY Mechanical 10,000,000 Operations (Minimum) Electrical 100,000 Operations @ Rated Load INDICATORS LED’s Show Condition of Outputs TEMPERATURE RATINGS Operate -4° to 131°F (-20° to +55°C) Storage -40° to 185°F (-40° to +85°C) ENCLOSURE Style “E” Lexan® Surface Mounted TERMINATIONS (12) #8-32 Screw Terminals WEIGHT 16 oz. \\\WIRING \\\ORDERING INFORMATION MODEL NUMBER DESCRIPTION ARA-120-AHE Special Function Alternating Relay INCLUDES “ LOAD OMIT” SWITCH

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