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- Allen Bradley
- 1336-SN-SP21A
- Snubber Board
- USA
- 180 × 20 × 95 mm
- 0.59 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen Bradley 1336-SN-SP21A Snubber Board is an electronic protection component associated with Allen Bradley 1336 series industrial drives. A snubber circuit is used to control unwanted voltage transients and switching disturbances that can occur when power semiconductor devices turn on and off.
In a variable frequency drive, the power switching section operates at high speed. Every switching transition can produce voltage spikes caused by circuit inductance, wiring characteristics, and the switching behavior of the semiconductor devices. A properly designed snubber network helps control these transients and reduces electrical stress on the power components.
The 1336-SN-SP21A is therefore part of the drive’s power-electronics protection system. It works alongside the switching devices, gate-drive circuitry, DC bus, and other components rather than functioning as an independent control board.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen Bradley |
| Model | 1336-SN-SP21A |
| Product Type | Snubber Board |
| Series | 1336 Series |
| Main Function | Switching Transient Suppression |
| System Role | Power Electronics Protection |
| Application | Industrial Motor Drives |
| Typical Use | Power Switching Protection |
| Dimensions | 180 × 20 × 95 mm |
| Weight | 0.59 kg |
| Application Area | Industrial Automation and Motor Control |
Product Features
The 1336-SN-SP21A is designed to support the protection and stability of the drive’s switching section.
Key characteristics include:
- Snubber board design
- Associated with Allen Bradley 1336 series drive hardware
- Helps suppress switching-related voltage transients
- Reduces electrical stress on power switching components
- Supports stable operation of the power stage
- Works with the drive’s inverter circuitry
- Dimensions of 180 × 20 × 95 mm
- Stated weight of 0.59 kg
- Designed for integration into industrial drive electronics
The board is particularly relevant to the power switching section, where rapid changes in current and voltage can create transient conditions.
Working Principle
A snubber circuit typically works by absorbing, limiting, or controlling transient electrical energy generated during switching.
A simplified drive power path is:
DC Bus → Power Switching Devices → Motor
During switching, the parasitic inductance in the power circuit can cause a rapid voltage rise when current changes. The snubber network provides an additional electrical path that helps control these transient conditions.
This reduces the magnitude and duration of unwanted voltage spikes and can help protect semiconductor switching devices from excessive electrical stress.
The exact behavior of the snubber circuit depends on its electrical design and how it is integrated with the drive’s power stage.
Role in Allen Bradley 1336 Drives
The 1336-SN-SP21A supports the protection of the drive’s high-power switching circuitry.
| Function | Description |
|---|---|
| Transient Suppression | Helps control voltage spikes during switching |
| Power Device Protection | Reduces electrical stress on switching components |
| Switching Support | Helps maintain more controlled switching behavior |
| Circuit Protection | Provides additional protection within the power stage |
| Drive Integration | Works with other 1336 power electronics |
| Reliability Support | Helps reduce the effects of repetitive switching transients |
A snubber board does not normally control motor speed directly. Its role is primarily related to protecting and supporting the switching circuitry responsible for motor power conversion.
Industrial Applications
The 1336-SN-SP21A is associated with compatible Allen Bradley 1336 industrial drive systems.
| Application | Typical Use |
|---|---|
| Conveyor Systems | Variable-speed motor control |
| Pumps | Controlled motor operation |
| Fans | Speed regulation |
| Material Handling | Motor-driven equipment |
| Production Machinery | Variable-frequency motor control |
| Machine Tools | Controlled motor power |
| Process Equipment | Variable-speed operation |
| Industrial Automation | Drive system integration |
The exact application depends on the drive model and the configuration of its power stage.
Installation and Maintenance
The snubber board is connected to the drive’s power electronics, so maintenance requires appropriate electrical safety procedures.
Before servicing the board, the drive should be isolated from the relevant power sources and the DC bus should be verified to have discharged to a safe level according to the applicable maintenance procedure.
Recommended inspection points include:
- Confirm the complete 1336-SN-SP21A part number.
- Verify compatibility with the associated 1336 drive.
- Inspect the board for signs of overheating.
- Check terminals and connectors for damage.
- Inspect associated snubber components.
- Look for damaged resistors, capacitors, or circuit traces where applicable.
- Check the power switching devices for signs of failure.
- Inspect the DC bus and related power components.
- Check cooling and ventilation conditions.
- Verify correct installation before energizing the drive.
- Perform appropriate drive testing after replacement.
If the snubber board shows signs of failure, the switching devices and surrounding power circuitry should also be inspected. Repeated transient stress may be a symptom of another problem in the drive’s power stage.
Related Drive Components
The snubber board works together with several other components in the drive’s power section.
| Component | Function |
|---|---|
| Power Switching Devices | Switch DC bus power to generate motor output |
| Snubber Board | Controls switching transients |
| Gate Driver | Provides control signals to switching devices |
| DC Bus Capacitor | Stores and stabilizes DC-link energy |
| Bridge Rectifier | Converts AC input into rectified DC |
| Precharge Circuit | Controls initial DC bus charging |
| Control Board | Manages drive operation |
| Current Sensors | Monitor electrical current |
| Cooling System | Removes heat from power electronics |
These components should be considered together when diagnosing inverter-side faults or abnormal switching behavior.
Recommended Related Models
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Allen Bradley 1336-SN-SP21A | Snubber Board | Switching transient suppression | 1336 series drives |
| Allen Bradley 1336-QOUT-SP12B | Transistor Output Assembly Kit | Inverter power switching | 1336 series drives |
| Allen Bradley 1336-BDB-SP31C | Gate Driver | Power switching control | 1336 series drives |
| Allen Bradley 1336-CAP-SP15A | Bus Capacitor | DC bus energy storage | 1336 series drives |
| Allen Bradley 1336-BR-SP5A | Bridge Rectifier | AC-to-DC rectification | 1336 series drives |
When selecting a replacement snubber board, the complete part number, associated drive model, power-stage configuration, electrical connections, and hardware revision should be verified. Similar dimensions do not necessarily indicate electrical compatibility.
Key Advantages
- Supports suppression of switching transients
- Helps reduce voltage stress on power semiconductor devices
- Associated with Allen Bradley 1336 series drive hardware
- Supports reliable inverter operation
- Works with the drive’s power switching circuitry
- Suitable for industrial motor drive applications
- Dimensions of 180 × 20 × 95 mm
- Stated weight of 0.59 kg
- Suitable for drive maintenance and replacement applications
Technical FAQs
Why is a snubber circuit important in a high-power switching stage?
Rapid switching of inductive loads can generate voltage transients that place additional stress on semiconductor devices. A snubber circuit helps control these transient conditions and can reduce the peak electrical stress experienced during switching.
What symptoms may indicate a problem with the snubber section?
Abnormal switching behavior, repeated power-device failures, visible overheating, damaged snubber components, or recurring inverter faults may indicate a problem. However, these symptoms can also originate from the power semiconductors, motor circuit, DC bus, or gate-driver section.
How does the snubber board interact with the transistor output assembly?
The transistor output assembly performs the actual high-power switching, while the snubber circuit helps manage transient voltage conditions associated with those switching events. The two sections therefore operate closely together within the inverter power stage.
Can repeated snubber-board failures be caused by an external fault?
Yes. Excessive switching stress, abnormal motor loads, damaged power semiconductors, poor cooling, wiring problems, or other power-stage abnormalities can increase stress on the snubber circuitry. The surrounding circuit should be checked before simply replacing the board.
What should be verified when choosing a replacement 1336-SN-SP21A?
The exact drive model, complete part number, electrical configuration, board revision, mounting arrangement, and connections should be verified. The replacement should match the original drive application rather than being selected solely by physical dimensions.