1. Automation/Motion Controls For Sale
  2. sku: 16009959943246853
  3. ALLEN BRADLEY 1771-94S/B

ALLEN BRADLEY 1771-94S-B Ac Power Supply Module 1771-94S/B 120VAC 5VDC

1771-94s Allen Bradley 1771-94s/b 120v Ac Power Supply Module 120vac 5vdc

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1771-94S/B ), ( Part Type: Ac Supply Module ), ( Country Of Manufacture: United States )

Review ALLEN BRADLEY 1771-94s/b 120v Ac Power Supply Module 120vac 5vdc

The **Allen-Bradley 1771-94S/B** is a high-performance, industrial-grade power supply module designed to deliver reliable and stable DC power for critical control applications within the **CompactLogix** and **ControlLogix** programmable logic controller (PLC) systems. This **120VAC input, 5VDC output** module is engineered to provide a consistent and clean 5-volt DC supply essential for powering the internal components of compatible Allen-Bradley controllers, ensuring seamless operation in demanding industrial environments. With a robust construction and adherence to strict industrial standards, the 1771-94S/B is built to withstand harsh conditions, including temperature fluctuations, electrical noise, and mechanical stress, making it an ideal choice for manufacturing, process control, and automation systems where reliability is paramount.

Featuring a **120VAC input range of 85 132VAC**, this power supply module is designed to accommodate variations in utility voltage, ensuring stable operation even in regions with inconsistent power supplies. The module converts this AC input into a **regulated 5VDC output**, delivering up to **1.5 amps of current** to power the controller s CPU, memory, and communication modules, while maintaining precise voltage regulation to prevent potential damage to sensitive electronic components. Its **compact and modular design** allows for easy installation within the **1771 series chassis**, enabling seamless integration into existing control systems without requiring significant modifications to the infrastructure.

The **1771-94S/B** incorporates advanced protection features to safeguard both the power supply and the connected PLC system. These include **overvoltage, undervoltage, and short-circuit protection**, which help prevent equipment damage from power surges, brownouts, or wiring faults. Additionally, the module is equipped with **reverse polarity protection**, ensuring that accidental incorrect wiring will not result in catastrophic failure. Its **fan-cooled design** facilitates efficient heat dissipation, allowing for reliable operation in environments where ambient temperatures may reach up to **60 C (140 F)**, while still maintaining optimal performance. This makes the 1771-94S/B particularly well-suited for applications in factories, oil and gas facilities, and other industrial settings where temperature and electrical stability are critical.

Beyond its technical specifications, the **Allen-Bradley 1771-94S/B** is a testament to Rockwell Automation s commitment to **interoperability and long-term compatibility**. As part of the **CompactLogix** and **ControlLogix** ecosystem, this power supply module is fully supported by Rockwell s extensive software suite, including **Studio 5000**, ensuring seamless integration with programming, monitoring, and diagnostic tools. Its **backward and forward compatibility** with other Allen-Bradley controllers and expansion modules further enhances its versatility, allowing engineers and technicians to upgrade or modify systems without encountering compatibility issues. Whether deployed in a new installation or as a replacement for an aging power supply, the **1771-94S/B** delivers the dependability and efficiency required to maintain continuous operation in mission-critical automation applications.

### **Pros and Cons of buying a Allen-Bradley 1771-94S/B (120V AC Power Supply Module)**

#### **Pros:**

1. **Compatibility with Allen-Bradley Systems** This power supply is designed specifically for use with Allen-Bradley PLCs and control systems, ensuring seamless integration with compatible modules like the 1771 series.

2. **Reliable Power Conversion** It converts 120V AC to 5V DC, providing stable power for sensitive control components, reducing the risk of voltage fluctuations damaging connected devices.

3. **Industrial-Grade Quality** Allen-Bradley components are built for harsh industrial environments, offering durability and long-term reliability in factories, manufacturing plants, and automation systems.

4. **Easy Installation and Replacement** The modular design allows for straightforward installation and replacement, minimizing downtime in maintenance scenarios.

5. **Support for Multiple Applications** Suitable for use in PLCs, motor starters, HMI systems, and other industrial automation setups where a stable 5V DC supply is required.

6. **Backward Compatibility** Works with older Allen-Bradley systems, making it a viable option for upgrading or repairing legacy installations.

7. **Widely Available Replacement Parts** Since Allen-Bradley is a well-established brand, finding replacement modules or technical support is generally easier than with less common suppliers.

#### **Cons:**

1. **High Cost** Allen-Bradley components, especially genuine OEM parts, tend to be expensive compared to third-party or generic alternatives.

2. **Limited Availability of New Stock** Due to Rockwell Automation s shift toward newer product lines (e.g., 1771-94S/B may be discontinued), sourcing new units can be challenging, often requiring purchases from refurbished or used markets.

3. **Potential for Counterfeit Parts** Since demand for used/refurbished units is high, there is a risk of purchasing counterfeit or low-quality replacements, which could fail prematurely.

4. **Compatibility Risks with Non-Allen-Bradley Systems** While designed for Allen-Bradley, using it in non-compatible systems may lead to performance issues or damage.

5. **Maintenance and Training Dependency** Proper installation and troubleshooting require technical expertise, and untrained personnel may struggle with diagnostics or repairs.

6. **Long Lead Times for New Units** If sourcing from authorized distributors, ordering new stock may take weeks or months, causing delays in maintenance or upgrades.

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### **Conclusion**

The **Allen-Bradley 1771-94S/B** is a high-quality, reliable power supply module ideal for industrial automation applications where compatibility with Allen-Bradley systems is critical. Its durability, stability, and ease of integration make it a strong choice for maintaining or upgrading existing setups. However, the high cost, potential availability issues, and risk of counterfeit parts must be carefully considered, especially if budget constraints or sourcing challenges exist.

If you require a **cost-effective alternative**, third-party or refurbished units from reputable suppliers (with proper testing) may be viable. However, if **long-term reliability and OEM support** are priorities, investing in a genuine or well-vetted refurbished module is justified.

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### **Recommendation**

- **If budget allows and sourcing is not an issue:** Purchase a **new or certified refurbished unit** from an authorized Rockwell Automation distributor to ensure authenticity and warranty coverage.

- **If cost is a concern:** Explore **reputable third-party suppliers** (e.g., Grainger, Moxa, or specialized automation resellers) that offer tested, compatible alternatives. Verify the seller s return policy and warranty.

- **For legacy systems:** Confirm compatibility with your specific PLC model and consider consulting an automation specialist to avoid integration issues.

- **Avoid unknown sellers:** When buying used or refurbished, prioritize vendors with return policies and certification to mitigate risks of counterfeit or damaged parts.

Ultimately, the decision depends on your **priorities between cost savings and long-term reliability**. For mission-critical applications, the extra investment in a trusted source is often worth the peace of mind.

Details:

Next Day Second Air Services are available. Will there be a dock or forklift. LOCAL PICK-UP, Prefer to pick it up yourself. Need it urgently.

After the return period has ended, you can no longer product. The shipping price is shown for US lower 48 states. Your phone number and business name. All listed items are in stock at Bullseye Industrial Sales 180,000 sq.

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part #: 177194s price

  • $180.74

specifications automationjack:

  • brand: Allen Bradley
  • mpn: 1771-94s/b
  • part type: Ac Supply Module
  • country of manufacture: United States

seller automationjack:

  • rating: 99.8%
  • # reviews: 66081
  • city: Middlebury, Indiana

returns automationjack:

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

general automationjack:

  • Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment
  • condition: Used

offer automationjack:

  • started: June 6, 2026
  • options: Ship-to-home
  • availability: In Stock
  • best offers: True
  • sold: 0
  • quantity: 1

payments automationjack:

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  • wallet: Paypal

shipping automationjack:

  • cost: $21.14
  • class: Standard, One-day
  • transit: 3-6 Days
  • carrier: UPS, USPS
  • service: UPS Ground, UPS Next Day Air, USPS Ground Advantage
  • type: Calculated
part type: ac supply module, country of manufacture: united states,
category: business & industrial > industrial automation motion controls > automation equipment, sku: 16009959943246853,
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  • Used. Offer #1 priced at $180.74 + $21.15 shipping estimate = $201.89* total. +$21.15 shipping

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