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Carlo Gavazzi DLA71TB233P - 115/230 VAC 3 PUMP ALTERNATING RELAY
Carlo Gavazzi

DLA71TB233P


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Specification Sheet

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Overview

The Carlo Gavazzi DLA71TB233P is a 3-pump alternating relay designed for balanced motor control in industrial fluid systems. This relay operates on a universal 115/230 VAC supply, ensuring compatibility with global power standards. It features three independent 5A SPST contacts, allowing precise control of up to three pumps in sequence or differential mode. The DLA71TB233P includes an automatic delay function to prevent inrush current spikes during pump cycling, protecting motors and extending equipment lifespan. Housed in a compact 35 mm DIN-rail mountable enclosure (80 x 45 x 99.5 mm), this relay is ideal for water treatment, HVAC, and industrial fluid transfer systems. Its automatic rotation feature ensures balanced wear across pumps, reducing maintenance needs. Certified to CE, UL, and CSA standards, the DLA71TB233P delivers reliable performance in demanding environments.
  • Controls up to 3 pumps for balanced operation
  • Universal 115/230 VAC power supply
  • Features 3 independent 5A SPST contacts
  • Automatic delay function protects motors
  • Compact 35mm DIN-rail mountable enclosure

Specifications

Current Rating
5A
Mounting Type
DIN-Rail Mount
Poles
3 SPST
Size
80 x 45 x 99.5 mm
Voltage Rating
115/230 VAC
Package Dimensions (L x W x H)
2.87 in x 3.9 in x 1.77 in
Package Weight (Imperial)
0.28 lbs
The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. 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 on datasheet). 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.

ARP43S

The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. 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 on datasheet). 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.
The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. 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 on datasheet). 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.

ARP42S

The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. 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 on datasheet). 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.
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. 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!

ALT-115-S

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. 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!
ALTERNATING RELAY

AR120A-3095

ALTERNATING RELAY
CROSS-WIRED ALT RELAY/ 95-125V

ALT115-X

CROSS-WIRED ALT RELAY/ 95-125V

Frequently Asked Questions about Carlo Gavazzi

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Carlo Gavazzi products are used across a wide range of strategic industries, including Food and Beverage, Semiconductors, EV Charging Stations, Energy Storage, Manufacturing, Agriculture, HVAC, Data Centers, Mining, Elevators, Conveyors, and Mobile Equipment. Their product lines specifically support industrial automation, energy monitoring, control systems, and sensing applications in these sectors, with specialized solutions for power analysis, current measurement, data logging, and industrial control components.

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What are the main product lines offered by Carlo Gavazzi?

Carlo Gavazzi offers a comprehensive range of industrial automation product lines, including power supplies, sensors, solid state relays, energy meters, monitoring relays, motor controllers, and control components. Their key product ranges span sensors, switches, and controls, with specific lines like 1-phase and 3-phase power supplies, photoelectric and inductive sensors, IO-Link sensors, energy analyzers, and industrial relays designed for strategic industries including food and beverage, EV charging, manufacturing, and building automation.

What are the key features of Carlo Gavazzi products?

Carlo Gavazzi products feature advanced industrial automation technologies across multiple product lines, including energy meters, power analyzers, sensors, and IoT solutions. Key features include integrated communication protocols like Modbus TCP/IP, Microsoft Azure and AWS compatibility, IO-Link sensor capabilities, and robust design for industrial environments. Their products offer high-performance monitoring, data logging, and control functions with emphasis on energy efficiency, remote connectivity, and flexible integration across industrial and building automation applications.

What communication protocols do Carlo Gavazzi products support?

Carlo Gavazzi products support multiple industrial communication protocols including Modbus TCP/IP, Modbus RTU, PROFINET, EtherNet/IP, HTTP, FTP, and OPC UA. Their energy management platforms like UWP4.0 and VMU-C EM are designed with flexible communication capabilities, enabling integration with IoT platforms such as Microsoft Azure and Amazon AWS, and supporting both local and remote monitoring across various industrial automation systems.

What accessories are available for Carlo Gavazzi products?

Carlo Gavazzi offers a comprehensive range of accessories for their sensors and automation components. These include PVC and PUR cordsets in various lengths and configurations, universal mounting brackets for cylindrical sensors (Ø4 to Ø30 mm), galvanized and stainless steel mounting brackets, and a wide selection of reflectors for photoelectric sensors. Specific accessories include IP67 and IP68 cordsets with straight or right-angle M12 connectors, terminals for hardwiring, and specialized reflectors like the heated ER681 for cold installations.

How are Carlo Gavazzi products typically installed?

Carlo Gavazzi products are typically installed using flexible mounting options including DIN-rail, around busbars, directly onto back panels, and with various current transformer configurations. Energy meters, power analyzers, and monitoring devices can be mounted with split-core or solid-core current transformers, supporting installation ranges from 600A to 3200A primary current. Many products feature modular designs with optional communication modules like Modbus-RTU, BACnet-IP, and built-in web servers to facilitate easy integration into industrial and building automation systems.

What certifications and standards do Carlo Gavazzi products comply with?

Carlo Gavazzi products meet rigorous international certification standards, including UL (United States), cULus (Canada), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia & New Zealand). Our products comply with critical mechanical and functional safety standards such as EN 60529 (IP protection), EN 61800-5-2, ISO 13849-1, and IEC 61508, ensuring high reliability and performance across industrial automation applications.

What is Carlo Gavazzi's warranty policy?

Carlo Gavazzi provides a standard 18-month warranty from the invoicing date for its automation products, covering defects in workmanship and materials. The warranty requires proper transportation, handling, storage, and installation within specified environmental conditions. Warranty coverage is contingent on correct operation within designed capacity limits, scheduled preventive maintenance, and repairs performed only by authorized WEG service technicians.