WATLOW SCR-Q33 Qpac Power Controller Phase Leg 480V Q33-481-300-AFO

( Brand: Watlow ), ( Part Type: Leg 480v Controller ), ( Series: Qpac ), ( Output Voltage Rating: Ac ), ( Nominal Current Rating: 300 A ), ( Manufacturer Part Number: SCR-Q33 ), ( Country Of Origin: United States )

Review WATLOW Qpac 480v 300a Scr Power Controller Phase Leg

The Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller is a versatile and reliable solution for managing resistive heating applications in various industries. This phase leg controller, specifically model Q33-481-300-AFO, is designed to deliver high power density and precise temperature control.

The controller operates on a 480V power supply and is capable of handling a maximum current of 300A. It utilizes Silicon Controlled Rectifier (SCR) technology to efficiently manage the electrical power and optimize heating processes. This design provides excellent thermal response and precise temperature control, ensuring consistent and accurate results.

The Q33 controller's housing is made of durable materials, ensuring it can withstand the demanding conditions of industrial environments. It is designed with safety features such as overcurrent and overvoltage protection to prevent potential damage to the controller or connected equipment. Additionally, it features an easy-to-use front panel interface for simple setup and monitoring of temperature and current values.

The controller's design allows for easy integration with various heating systems and processes. It can be used with a variety of heating elements, including cartridge heaters, immersion heaters, and band heaters. The controller also supports multiple input signals, including thermocouples and RTDs, to provide accurate temperature feedback and control.

The Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller is backed by Watlow's commitment to quality and customer support. It comes with comprehensive documentation, including installation instructions, wiring diagrams, and operating manuals, to help ensure a smooth installation and operation process. Additionally, Watlow offers technical support and maintenance services to help keep your controller performing at its best.

In summary, the Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller is a robust and reliable solution for managing resistive heating applications in industrial settings. Its SCR technology provides excellent thermal response and precise temperature control, while its durable design and safety features ensure reliable operation in demanding environments. With easy integration, comprehensive documentation, and exceptional customer support, this controller is an excellent choice for any industrial heating application.

The Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller (part number: Q33-481-300-AFO) is a heavy-duty, solid-state SCR control that offers several advantages for industrial applications. Here are some of its key pros and cons:

1. Reliability: This SCR controller is known for its robust design and reliability. It is built to withstand harsh industrial environments and can handle high current loads, making it suitable for heavy-duty applications.

2. Easy to use: The controller features a user-friendly interface that allows for easy setup and operation. It also offers remote monitoring capabilities, allowing users to keep track of the controller's status from a distance.

3. Versatile: This controller can be used in a variety of applications, including heating, motor control, and process control. It is compatible with a wide range of sensors and transducers, making it a versatile choice for industrial automation.

4. Energy efficient: The SCR technology used in this controller is energy efficient, which can help reduce energy costs over time.

5. Durable: The controller is designed to be durable and long-lasting. It can withstand high temperatures and harsh environments, making it suitable for use in demanding industrial applications.

1. Cost: The Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller is a high-end industrial controller, and as such, it comes with a higher price tag than some other options on the market.

2. Complexity: While the controller is user-friendly, it can be more complex to set up and program than some other options. This may require additional training or expertise.

3. Limited compatibility: The controller may not be compatible with all sensors and transducers, which could limit its use in certain applications.

4. Maintenance: SCR controllers require regular maintenance to ensure optimal performance. This can include periodic inspections, cleaning, and replacement of components.

In conclusion, the Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller is a reliable, versatile, and energy-efficient choice for industrial applications that require heavy-duty power control. Its high price tag and complexity may be drawbacks for some users, but its durability and compatibility with a wide range of sensors and transducers make it a worthwhile investment for many industrial automation projects.

Recommendation: If you are looking for a high-performance, heavy-duty power controller for industrial applications, the Watlow SCR-Q33 QPAC 480V 300A SCR Power Controller is a strong contender. Its robust design, user-friendly interface, and versatility make it an excellent choice for demanding applications. However, be prepared for a higher cost and some complexity in setting it up and programming it. If you have a smaller budget or less complex requirements, there may be other options on the market that better suit your needs.

Details:

Watlow QPAC Q33-481-300-AFO Modular SCR Power Controller 3 phase / leg unit rated at 480 volts /300 amps 60hz enclosed in type 'C' case. Looks unused with light wear from storage - fuses tested fine for continuity but unit not otherwise, info Watlow: Modular SCR Power Controller Custom Tailoring to the Application The QPAC SERIES Watlow is a modular Silicon Controlled Rectifier SCR power controller plug-in features flexibility. Open heater or shorted SCR. Bases are rated from 150 to 1000 amperes in one-phase, three-phase, two leg and three.

This power controller includes 200KA short circuit current rating SCCR and high speed fuses to minimize damage in the event of. A variety of transformers are available NOT INCLUDED from 120 to 575VAC along with 50/60Hz operation enable the QPAC operate in applications anywhere.

part #: scrq33 prices

• $125.00-$945.00

specifications strialpower:

• brand: Watlow
• part type: Leg 480v Controller
• series: Qpac
• output voltage rating: Ac
• nominal current rating: 300 A
• manufacturer part number: SCR-Q33
• country of origin: United States

general strialpower:

• condition: Used
• Electrical Equipment Supplies > Power Supplies > Switching Mode Power Supplies

offer strialpower:

• quantity: 1
• started: December 8, 2025
• options: Ship-to-home
• availability: In Stock
• best offers: True
• sold: 0

shipping strialpower:

• cost: $105.14
• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• transit: 3-7 Days
• type: Calculated
• carrier: FedEx

returns strialpower:

• time: 30 Days
• policy: Returns Accepted
• paid by: Buyer
• method: Money back

seller strialpower:

• rating: 100.0%
• # reviews: 16051
• city: Corvallis, Oregon

payments strialpower:

• credit card: Mastercard
• other
• wallet: Paypal

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