GE S739DVT

Description

Product Description

GE S739DVT is a contactor, specifically a Definite Purpose Contactor from GE’s extensive line of motor control components. This product is not a PLC module but a critical electromechanical actuator that is directly controlled by a PLC’s digital output. The GE S739DVT is designed for the frequent switching of resistive or inductive loads, most commonly electric heaters, lighting banks, and small motor loads. Its primary function is to act as a robust, remotely operated switch that opens or closes a power circuit based on a low-voltage control signal from the PLC. The reliability of the S739DVT is essential for automated process heating, environmental control, and material handling sequences. For control panel designers, selecting the correct contactor like the GE S739DVT is a fundamental step in translating PLC logic commands into physical actions on the plant floor.

Product Parameters / Technical Specifications

• Manufacturer: GE (General Electric) – now part of ABB following the acquisition of GE Industrial Solutions
• Product Line: GE Definite Purpose Contactors
• Functional Designation: Definite Purpose Contactor (DPC)
• Pole Configuration: Typically a 3-pole contactor (for switching three-phase power), though variations exist.
• Voltage Rating: Rated for specific AC voltage levels, commonly 240VAC or 480VAC.
• Current Rating: The thermal current rating (Ith) defines the maximum continuous current it can carry. The “40” in S739D40VT indicates a 40 Amp rating. The full model S739DVT often specifies a range, so the exact amperage must be confirmed.
• Coil Voltage: Available in various standard control voltages (e.g., 24VAC/VDC, 120VAC, 240VAC) to match the PLC’s output power supply.
• Auxiliary Contacts: May include one or more normally open (NO) or normally closed (NC) auxiliary contacts for providing status feedback to the PLC’s input module.
• Enclosure: Open-style design for mounting inside a control panel or enclosure.
• Standards: Designed to meet UL and IEC standards for switching duty.

Advantages and Key Features

• High Electrical Life: Engineered for a high number of mechanical and electrical operations, making it suitable for frequent cycling applications common in automated processes controlled by a PLC.
• Compact and Efficient Design: Offers a high switching capacity in a relatively small footprint, saving valuable space in control panels.
• Reliable Performance: Provides consistent and reliable operation for switching heating, lighting, and motor loads, which is crucial for maintaining process consistency.
• Easy Installation: Features clear terminal markings and straightforward mounting, simplifying panel assembly and wiring.
• Wide Coil Voltage Availability: Can be ordered with a coil voltage that matches the existing control circuit power, ensuring easy integration with PLC output circuits.

Application Cases in Industry

• Industrial Heating Control: A primary application for the GE S739DVT is switching banks of electric heating elements in ovens, furnaces, dryers, and HVAC unit reheats based on PLC temperature control logic.
• Lighting Control: Used for automated switching of industrial or outdoor lighting banks in warehouses, parking lots, and stadiums, often managed by a PLC’s time schedule or photocell input.
• Small Motor Control: Controls three-phase motors for fans, pumps, and small conveyors as part of a larger automated sequence.
• Capacitor Bank Switching: Can be used for switching power factor correction capacitors in and out of the circuit under PLC command.

Comparison with Competing Products

Selection Suggestions and Precautions

1. Verify Full Load Amperage (FLA): Crucially important. You must select a contactor whose current rating exceeds the full-load amperage of the load it is switching (heater bank, motor). For motor loads, also consider the inrush current. The GE S739DVT rating must be adequate.
2. Match Coil Voltage to Control Circuit: Specify the correct coil voltage (e.g., S739DVT*24* for 24VAC) that matches the output voltage of your PLC’s power supply or output module. An incorrect coil will not operate or will burn out.
3. Provide Proper Overcurrent Protection: The contactor itself does not provide short-circuit or overload protection. The power circuit must be protected by appropriately sized fuses or circuit breakers upstream.
4. Use Correct Wire Size and Torque: Use wire that is properly sized for the load current and tighten all power and control terminals to the manufacturer’s specified torque to prevent overheating.
5. Consider the Use of a Snubber: For inductive loads (motors, transformers), consider installing an RC snubber circuit across the contactor’s coils to suppress voltage spikes that can damage the PLC output module driving the coil.
6. Sourcing: This is a common industrial component. Source the GE S739DVT from authorized electrical distributors to ensure you receive a genuine product with the correct specifications.

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