Allen-Bradley 74101-772-54 (1336T-MCB-SP51B) Main Control Board – 1336 PLUS II AC Drive Series
When the main control board of an AC variable frequency drive fails on the production floor, the consequences are immediate and severe: conveyor lines halt, motor control is lost, and entire manufacturing cells go dark. Unplanned downtime in heavy industry can cost thousands of dollars per hour. The Allen-Bradley 74101-772-54 (1336T-MCB-SP51B) Main Control Board is the critical intelligence hub of the 1336 PLUS II drive — without it, the drive cannot execute speed commands, process feedback signals, or protect connected motors. Sourcing a verified replacement quickly is not optional; it is mission-critical.
The 1336T-MCB-SP51B is the primary control board designed specifically for Allen-Bradley’s 1336 PLUS II series of AC drives — one of the most widely deployed variable frequency drive platforms in global industrial automation. Introduced as part of Rockwell Automation’s flagship mid-range drive lineup, the 1336 PLUS II series has been installed across tens of thousands of facilities worldwide in industries ranging from automotive assembly to water treatment. The SP51B board revision represents a mature, field-proven design with robust EMI filtering and enhanced firmware compatibility, making it a trusted choice for maintenance engineers managing legacy drive infrastructure.
Technical Specifications
- Part Number: 74101-772-54
- Board Reference: 1336T-MCB-SP51B
- Compatible Drive Series: Allen-Bradley 1336 PLUS II AC Drive
- Board Type: Main Control Board (MCB)
- Manufacturer: Allen-Bradley / Rockwell Automation
- Weight: 480 g (approx.)
- Condition Available: New, Refurbished, Tested Used
Key Features & Benefits
- Drop-in Replacement: Direct OEM-equivalent board — no firmware re-flashing or parameter reconfiguration required in most installations.
- Full Drive Intelligence: Manages speed reference processing, PID control loops, fault diagnostics, and I/O communication for the 1336 PLUS II platform.
- Field-Proven Reliability: The SP51B revision incorporates design improvements over earlier board revisions, offering enhanced noise immunity in high-EMI environments.
- Fast Downtime Recovery: Stocked and ready to ship — minimizing mean time to repair (MTTR) for critical drive assets.
- Broad Compatibility: Compatible across multiple 1336 PLUS II drive frame sizes and power ratings.
- Quality Tested: Each board undergoes functional verification before dispatch.
Industry & Equipment Applications
- Automotive Manufacturing: Conveyor systems, robotic welding cell drives, paint line ventilation fans.
- Food & Beverage Processing: Pump drives, mixer motor control, packaging line conveyors.
- Water & Wastewater Treatment: Centrifugal pump VFD control, aeration blower drives.
- Oil & Gas: Compressor motor drives, pipeline pump stations.
- Mining & Minerals: Belt conveyor drives, crusher motor control.
- HVAC & Building Automation: Air handling unit fan drives, chiller pump control.
- Pulp & Paper: Winder drives, refiner motor control systems.
System Integration & Compatible Parts
The 1336T-MCB-SP51B is designed to integrate within the Allen-Bradley 1336 PLUS II drive ecosystem. Compatible and commonly paired components include:
- 1336 PLUS II Power Structure Boards
- 1336 PLUS II Gate Driver Boards
- 1336 PLUS II Human Interface Modules (HIM)
- 1336 PLUS II Communication Adapter Cards (DeviceNet, Profibus, Ethernet/IP)
- Allen-Bradley PLC platforms: ControlLogix, CompactLogix, SLC 500, PLC-5
If you require a complete drive rebuild kit or need assistance identifying additional compatible components, our technical team is available to assist.
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley control board passes through a structured quality verification process before shipment:
- Visual Inspection: Component-level inspection for burnt traces, damaged capacitors, cracked solder joints, and corrosion.
- Functional Power-On Test: Board is energized and verified for correct initialization and communication response.
- Firmware Version Check: Board firmware is documented and disclosed to the buyer prior to shipment.
- ESD-Safe Packaging: All boards are shipped in anti-static bags with foam cushioning inside double-wall cartons.
- Traceability Documentation: Each shipment includes a test report and part identification label.
How to Order
Konmask.com operates as a B2B industrial parts supplier. To place an order or request a quotation:
- Email: [email protected]
- Phone / WhatsApp: +0086 19859288691
- Online Inquiry: Submit your part number and required quantity via our website inquiry form.
- Lead Time: In-stock items typically ship within 1–3 business days. Please confirm availability before ordering.
- Payment Terms: T/T (Bank Transfer), PayPal, and other B2B payment methods accepted. Contact us for terms.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation Parts: We focus exclusively on PLC modules, DCS components, and AC drive parts — not a generalist marketplace.
- ✅ Global Sourcing Network: Access to both new OEM stock and quality-verified surplus inventory from trusted industrial sources worldwide.
- ✅ Technical Support: Our team includes engineers with hands-on experience in Rockwell Automation systems — we speak your language.
- ✅ Fast International Shipping: DHL, FedEx, and UPS express options available to most countries within 3–7 business days.
- ✅ Transparent Communication: We disclose board condition, firmware version, and test results before you commit to purchase.
- ✅ Competitive Pricing: Direct sourcing relationships allow us to offer competitive pricing on hard-to-find industrial parts.
Frequently Asked Questions
Q: Is the 74101-772-54 the same as 1336T-MCB-SP51B?
A: Yes. 74101-772-54 is the Rockwell Automation internal part number (PCB assembly number), while 1336T-MCB-SP51B is the catalog/ordering reference. Both refer to the same physical board.
Q: Which 1336 PLUS II drive frames is this board compatible with?
A: The 1336T-MCB-SP51B is used across multiple 1336 PLUS II frame sizes. Please contact us with your drive’s full nameplate information (catalog number, series, and firmware version) to confirm compatibility before ordering.
Q: Can I use this board to replace an earlier SP revision (e.g., SP50B)?
A: In many cases, SP51B is backward compatible with earlier SP revisions, but this depends on the drive’s firmware and hardware series. Our technical team can advise based on your specific drive configuration.
Q: Do you provide a warranty on this part?
A: Yes. We offer a standard warranty on all tested and refurbished boards. Warranty terms vary by condition (new vs. refurbished). Please confirm warranty details with our sales team at the time of inquiry.
Q: How do I safely install this control board?
A: Always de-energize the drive and follow Rockwell Automation’s lockout/tagout procedures before replacing any internal board. Refer to the 1336 PLUS II User Manual (publication 1336 PLUS-5.0) for detailed board replacement procedures. Our team can provide guidance if needed.
Q: Can you ship to my country?
A: We ship internationally to most countries via DHL, FedEx, and UPS. Contact us with your destination for a shipping quote and estimated delivery time.
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