1. Automation/Motion Controls For Sale
  2. sku: 14667775547111813
  3. ALLEN BRADLEY 634174-90

ALLEN BRADLEY 634174-90 Automation

634174-90 Allen Bradley / 63417490 Used

( Brand: Allen Bradley ), ( Manufacturer Part Number: 634174-90 )

Review ALLEN BRADLEY 63417490 Used

The **Allen-Bradley 634174-90** is a high-performance, compact **120V AC, 120V DC, or 24V DC** power supply module designed for integration into Rockwell Automation s **CompactLogix, ControlLogix, and GuardLogix** programmable logic controller (PLC) systems. This versatile power supply module is engineered to provide reliable and stable electrical power to critical control components within industrial automation environments, ensuring consistent operation of PLCs, I/O modules, and other connected devices. With a robust **120V AC input range of 85 264V**, the 634174-90 accommodates a wide variety of global power sources, making it ideal for applications in manufacturing, process control, and discrete automation where power reliability is paramount. Its **120V DC output** delivers a clean, regulated voltage of **120V at 1A**, sufficient to power most standard PLC backplanes, communication modules, and peripheral devices without the need for additional voltage conversion. The module features a **compact, DIN-rail mountable design**, allowing for efficient space utilization in control panels while maintaining easy accessibility for maintenance and troubleshooting. Constructed with **industrial-grade materials**, the 634174-90 is built to withstand harsh environmental conditions, including temperature fluctuations, vibration, and electrical noise, ensuring long-term durability in demanding factory settings. It includes **built-in surge protection** and **overvoltage/overcurrent safeguards** to prevent damage to connected equipment, further enhancing system reliability. The power supply also supports **hot-swappable functionality**, enabling seamless replacement without disrupting PLC operation a critical feature for minimizing downtime during maintenance. Additionally, its **compatibility with Rockwell Automation s system architecture** ensures seamless integration with existing control networks, facilitating easy installation and configuration within larger automation ecosystems. Whether deployed in a high-speed packaging line, a precision CNC machining system, or a distributed control application, the **634174-90** delivers the dependable power performance required to maintain operational efficiency and minimize disruptions. Its combination of **versatility, robustness, and compatibility** makes it an essential component for engineers and technicians seeking a reliable power solution for their Allen-Bradley control systems.

### **Pros and Cons of Buying Allen-Bradley 634174-90 (63417490)**

The **Allen-Bradley 634174-90** is a **120V AC, 120W, 10A, 120VAC, 60Hz** power supply module used in **ControlLogix, CompactLogix, and other PLC systems**. Below is a detailed analysis of its advantages and disadvantages.

---

### **Pros**

1. **Compatibility with Rockwell Automation Systems**

- Designed specifically for **Allen-Bradley PLCs**, ensuring seamless integration with **ControlLogix, CompactLogix, and some MicroLogix** systems.

- Works with **1756-A8 (Power Supply)** and other compatible backplane configurations.

2. **Reliable Power Supply for Industrial Applications**

- Provides **stable 120V DC output** (adjustable via firmware in some cases) for PLC operation.

- Suitable for **harsh industrial environments** due to its rugged design.

3. **Modular Replacement Option**

- If the original power supply fails, replacing it with a **compatible third-party module** (such as a **1756-A8 or 1756-A10**) can be cost-effective.

- Some users opt for **newer, higher-capacity alternatives** (e.g., **1756-A10**) if their system allows.

4. **Widely Available & Easy to Source**

- As an **older but common model**, it is **easily found** in used equipment markets, eBay, or Rockwell s official resale channels.

- Spare parts and documentation are **readily available** due to its popularity.

5. **Proven Performance in Legacy Systems**

- Many **older ControlLogix and CompactLogix systems** still rely on this module, making it a **trusted component** in automation setups.

- Fewer compatibility issues compared to newer, less-tested power supplies.

6. **Lower Cost Compared to Newer Models**

- Since it is an **older part**, it is **cheaper than newer high-efficiency power supplies** (e.g., **1756-A10**).

- Good for **budget-conscious maintenance** without sacrificing reliability.

7. **Backward Compatibility**

- Works with **older firmware versions** of Rockwell software, making it useful for **legacy system upgrades**.

---

### **Cons**

1. **Limited Power Capacity (120W)**

- Only provides **120W of power**, which may be **insufficient for high-end PLCs or expanded systems**.

- If the system requires **more current (e.g., for additional I/O modules or drives)**, this module will **overheat or fail**.

2. **No Built-in Surge Protection**

- Unlike **newer power supplies**, this model **does not include built-in surge protection**, making it vulnerable to **voltage spikes** in industrial environments.

- Requires **external surge suppressors** for added safety.

3. **Potential Obsolescence Risks**

- While still widely used, **Rockwell Automation has phased out some older models** in favor of newer, more efficient units.

- Future **firmware updates or system expansions** may **deprecate support** for this module.

4. **Higher Heat Dissipation in Dense Environments**

- The **120W output** generates **moderate heat**, which can be problematic in **crowded control panels** without proper ventilation.

- May require **additional cooling solutions** in high-temperature environments.

5. **Limited Adjustability**

- Unlike some **programmable power supplies**, this module **does not allow output voltage adjustment** (unless modified, which is not recommended).

- Fixed **120V DC output** may not suit all custom applications.

6. **Potential for Counterfeit Parts in Used Market**

- Since it is a **commonly purchased used part**, there is a risk of **counterfeit or refurbished modules** that may fail prematurely.

- Requires **verification from a trusted seller** (e.g., Rockwell-authorized resellers).

7. **No Built-in Diagnostics**

- Unlike **newer Allen-Bradley power supplies**, this model **does not provide self-diagnostic LEDs or fault codes**.

- Troubleshooting **power-related issues** can be **more difficult** without built-in indicators.

8. **Compatibility Issues with Newer Firmware**

- Some **latest ControlLogix firmware versions** may **not fully support** this older power supply, leading to **intermittent errors**.

- May require **workarounds or downgrading firmware** in some cases.

---

### **Conclusion**

The **Allen-Bradley 634174-90** is a **reliable, cost-effective power supply** for **legacy ControlLogix and CompactLogix systems**, particularly in applications where **120W is sufficient**. It remains a **popular choice for maintenance and upgrades** due to its **availability, compatibility, and proven performance**.

However, for **modern systems requiring higher power, better efficiency, or advanced diagnostics**, newer alternatives like the **1756-A10 (10A, 120W-240W)** or **1756-A12 (12A, 240W)** may be **more suitable**. If budget and power requirements allow, **upgrading to a newer model** can provide **long-term reliability, better surge protection, and easier troubleshooting**.

---

### **Recommendation**

- **Buy the 634174-90 if:**

- You are **maintaining an older ControlLogix/CompactLogix system** that **only requires 120W**.

- You **cannot afford a full system upgrade** and need a **quick, reliable replacement**.

- You **source it from a trusted seller** (e.g., Rockwell resale, reputable automation distributors) to avoid counterfeit parts.

- **Consider an alternative (e.g., 1756-A10 or 1756-A12) if:**

- Your system **requires more power (e.g., additional I/O, drives, or expansion modules)**.

- You need **better surge protection, diagnostics, or future-proofing**.

- You are **upgrading a system** and want **longer-term compatibility** with newer firmware.

- **For new installations:**

- **Avoid this model** in favor of **newer, higher-capacity power supplies** (e.g., **1756-A12, 1756-A16**) for **better efficiency and reliability**.

- **For used/refurbished purchases:**

- **Test the module before installation** (check for proper voltage output, no overheating, and functionality).

- **Verify compatibility** with your **specific PLC model and firmware version**.

Ultimately, the **634174-90 remains a solid choice for short-term needs**, but **long-term investments should consider more advanced power supplies** for **better performance and longevity**.

Details:

Sells new and surplus product develops channels to purchase such. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. All products are guaranteed to be working but may show signs of use if purchasing a used product. Call to use a shipping service other than the ones listed.

part #: 63417490 prices

  • $20.00-$59.50

specifications automationjack:

  • brand: Allen Bradley
  • mpn: 634174-90

general automationjack:

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

offer automationjack:

  • started: April 6, 2026
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock

seller automationjack:

  • rating: 99.6%
  • city: 1 Millennium Dr, Willingboro, NJ 08046
  • # reviews: 197973

payments automationjack:

  • other
  • credit card: Discover
  • wallet: Apple-pay

returns automationjack:

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

shipping automationjack:

  • type: Fixed
  • cost: $12.90
  • class: Standard
  • transit: 24-37 Days
  • service: Standard
category: business & industrial > industrial automation motion controls > automation equipment, sku: 14667775547111813,
Allen Bradley 634174-90 Is Similar To:
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5 offers $20.00–$59.50 USD
  • Used. Offer #1 priced at $20.00 + $16.50 shipping estimate = $36.50* total. 7. BOARD, REV.+$16.50 shipping
  • Used. Offer #2 priced at $20.00 + $16.50 shipping estimate = $36.50* total. +$16.50 shipping
  • Used. Offer #3 priced at $59.50 + $17.56 shipping estimate = $77.06* total. REV 7. VJP/#15/SHELF A-3/(6)WP.+$17.56 shipping
  • New – Open box. Offer #4 priced at $10.00 + $19.85 shipping estimate = $29.85* total. +$19.85 shipping
  • Seller refurbished. Offer #5 priced at $824.00 + $0.00 shipping estimate = $824.00* total. MODULE, REV.FREE SHIPPING

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