Allen Bradley 1336-SN-SP21A Inverter Snubber PC Board Assembly

FAQ

Q1: What is the Allen-Bradley 1336-SN-SP21A used for?
A: The 1336-SN-SP21A is an inverter snubber PCB used to suppress voltage transients and protect inverter power components inside Allen-Bradley 1336 series drives.

Q2: Which drives are compatible with the 1336-SN-SP21A?
A: It is designed for compatible Allen-Bradley 1336STEF Frame C drives and is commonly associated with 460V 1336 FORCE, IMPACT, PLUS, and PLUS II drive applications.

Q3: What is the main function of a snubber board?
A: A snubber board absorbs and limits voltage spikes produced during power switching, reducing stress on inverter semiconductors and improving drive reliability.

Q4: Is the 1336-SN-SP21A a complete variable frequency drive?
A: No. It is only a replacement protection PCB assembly installed inside compatible Allen-Bradley 1336 drive units.

Q5: What problems may indicate a failed snubber board?
A: Possible symptoms include inverter faults, repeated power module failures, overvoltage alarms, abnormal switching behavior, or visible damage to snubber components.

Q6: What are the dimensions and weight of the 1336-SN-SP21A?
A: The approximate dimensions are 150 × 100 × 35 mm, and the weight is approximately 0.30 kg. Actual values may vary depending on hardware revision and packaging.

Q7: Can the 1336-SN-SP21A replace other snubber boards?
A: Replacement should only be performed after confirming the drive series, voltage rating, frame size, PCB revision, and original spare part number. Different 1336 snubber boards are designed for specific power configurations.

Q8: What should be checked before installing the 1336-SN-SP21A?
A: Verify the drive model, voltage rating, board compatibility, mounting position, and connector condition. Disconnect power and fully discharge the DC bus before replacing the snubber board to ensure safe maintenance.

1336-SN-SP21A Allen Bradley

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