Allen Bradley 1336-SN-SP10A Inverter Snubber PCB Board

Product Introduction & Engineering Value

A failed snubber board can look like a much larger drive failure. The 1336-SN-SP10A exists to handle one specific but critical job: controlling voltage transients created during inverter switching events. Installed inside high-power 1336 adjustable frequency drives, it supports the protection of IGBT assemblies and associated power electronics.

For maintenance teams keeping legacy 1336 platforms operational, this spare PCB provides a practical repair path without replacing an entire drive system. The component is commonly sourced as new surplus or refurbished inventory because the original product line has reached legacy status.

Technical Specifications

The official spare parts documentation lists the 1336-SN-SP10A as an inverter snubber PCB for 1336STEF 575V applications covering approximately 150–300 HP Frame E drive configurations.

Field Application & The “Trench” Experience

A steel processing plant had a 1336 PLUS drive controlling a large conveyor motor. During startup, the drive began generating intermittent overvoltage faults. Initial troubleshooting pointed toward the power module, but inspection showed abnormal stress marks around the inverter snubber assembly.

The maintenance team replaced the degraded 1336-SN-SP10A boards, verified DC bus behavior, and returned the drive to service without a complete drive replacement. The repair avoided a long lead-time retrofit project and preserved the existing motor control architecture.

Typical applications include:

1. Steel Mill Conveyor Systems — high-inertia loads requiring reliable inverter switching protection.
2. Large Pump Stations — 150–250 HP variable speed pumping equipment using legacy 1336 drives.
3. Material Handling Cranes — older drive systems where transient suppression protects power electronics during frequent acceleration cycles.

1336-SN-SP10A

1336-SN-SP10A

Transparency SOP: QA & Testing

Before supplying a new surplus or refurbished 1336-SN-SP10A, a professional spare-parts process should include:

1. Visual Inspection
   • Check PCB surface condition.
   • Verify connector integrity.
   • Inspect for heat discoloration, cracked components, or contamination.
2. Electrical Verification
   • Test snubber network components.
   • Check resistance and capacitor characteristics where applicable.
   • Confirm no visible electrical damage from previous failures.
3. Inventory Validation
   • Confirm exact part number marking.
   • Verify compatibility against the installed 1336 drive configuration.
   • Record inspection results before shipment.

The Veteran’s Tech Trap Guide

⚠️ Do not assume every 1336 snubber board is interchangeable.
The 1336 family contains multiple snubber assemblies. The wrong voltage class or frame-specific board can create improper protection characteristics.

⚠️ Replace the complete snubber set when required.
Some 1336 drive configurations use multiple snubber boards per drive. Mixing aged and new boards may leave uneven protection across inverter sections.

PRO TIP:
Before powering up after replacement, inspect the surrounding IGBT modules, DC bus capacitors, and gate drive circuits. A damaged snubber board is often a symptom of another power-stage problem.

⚠️ Handle with ESD precautions.
This is a sensitive PCB assembly. Poor handling during installation can introduce failures that are difficult to diagnose in the field.

Dynamic FAQ

1. What is the primary function of the Allen-Bradley 1336-SN-SP10A?

The 1336-SN-SP10A is an inverter snubber PCB that suppresses switching voltage spikes inside 1336 Series AC drives, helping protect inverter power components.

2. Which Allen-Bradley drives use the 1336-SN-SP10A?

It is commonly associated with 1336 PLUS, PLUS II, FORCE, and IMPACT drive platforms, particularly Frame E high-power configurations.

3. Is the 1336-SN-SP10A still manufactured by Rockwell Automation?

The component is considered a legacy/discontinued item, so replacement sourcing is typically through surplus, refurbished, or specialized industrial inventory channels.

4. What should I verify before ordering a replacement?

Confirm the drive family, frame size, voltage rating, horsepower range, and existing snubber board part number before purchase.

5. Do refurbished 1336-SN-SP10A boards come with warranty coverage?

Warranty terms depend on the supplier. Industrial surplus providers commonly offer their own inspection-backed warranty periods rather than an original manufacturer warranty.

6. Can the 1336-SN-SP10A replace other 1336 snubber boards?

Not automatically. Different 1336 snubber boards are designed for different voltage ratings, frames, and drive power ranges. Always match the exact catalog number before installation.