Key Product Data
Model: 122.93.02
Manufacturer: Allen-Bradley / Rockwell Automation
Component Type: Phase-Control Thyristor (SCR)
Current Rating: 800 A
Voltage Rating: 1600 V
Package Style: Disc-type press-pack semiconductor
Device Marking: NS40SH16 (reported on component listings; verify against the physical unit)
Product Status: Discontinued by manufacturer, reported effective January 1, 2015
Weight: Approximately 0.42 kg
A High-Current Semiconductor for Legacy Drive Equipment
The Allen-Bradley 122.93.02 is a high-power silicon-controlled rectifier (SCR) used in industrial power-conversion assemblies. Its phase-control function allows the conduction of current to be controlled through the timing of the gate signal, making this type of semiconductor suitable for high-current rectifier and DC drive applications.
Rated at 800 A and 1600 V in product records, the 122.93.02 belongs to the class of press-pack power semiconductors used in assemblies where substantial current must be handled through a clamped semiconductor stack.
This is a legacy replacement component rather than a current-generation general-purpose semiconductor. Rockwell's historical spare-parts documentation provides a useful equipment reference for maintenance teams working with older DC drive systems.
Where the 122.93.02 Appears in Drive Spare-Parts Records
Rockwell documentation identifies this thyristor in the spare-parts schedules for several large-capacity Reliance Electric drive systems.
| Equipment documentation | Application reference |
|---|---|
| AutoMax DPS, 1-quadrant S-6 units | 1500 A and 2000 A unit configurations |
| AutoMax DPS, 4-quadrant S-6R units | Listed in thyristor-related spare-parts schedules |
| FlexPak 3000 | S-6 1200–2000 A drive configurations |
The historical documentation also distinguishes the 122.93.02 from the 122.93.04, which appears in certain 690 V configurations. These references are useful when checking an older drive's parts list, but the complete unit type and input-voltage specification must be confirmed before selecting a replacement.
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Construction and Electrical Role
The 122.93.02 is described in component listings as a disc-type, press-pack thyristor. This construction is designed for compression mounting between conductive and thermal contact surfaces rather than conventional PCB mounting.
In a power-conversion assembly, SCRs are arranged in a circuit that controls or rectifies high-power electrical current. Their operation depends on the associated gate-drive circuitry, cooling arrangement, electrical connections and the configuration of the semiconductor stack.
For this reason, a replacement should be matched to the original device and its position in the assembly. A similar current rating or voltage rating alone does not establish interchangeability.
Legacy Replacement: What to Verify
Because the manufacturer has discontinued this part, sourcing is particularly relevant to maintenance of installed equipment.
Before ordering, check:
- Complete part number: Confirm 122.93.02 against the equipment spare-parts list.
- Electrical ratings: Verify the original current and voltage requirements.
- Equipment configuration: Check whether the unit uses an S-6 or S-6R arrangement and identify its input-voltage version.
- Physical construction: Compare the press-pack dimensions, contact surfaces and mounting requirements.
- Device identification: Inspect the semiconductor marking and compare it with the original component.
- Quantity: Confirm how many thyristors are required for the particular power module or bridge assembly.
For SCR replacement work, matching the complete semiconductor assembly requirements is essential. Differences in device characteristics or mounting conditions can affect current sharing, thermal behaviour and overall converter operation.
Frequently Asked Questions
What is Allen-Bradley 122.93.02?
It is a phase-control silicon-controlled rectifier (SCR) used in high-current industrial power-conversion equipment.
What are its published electrical ratings?
Product records identify the 122.93.02 as an 800 A, 1600 V thyristor. Always confirm the device marking and original equipment documentation when matching a replacement.
Which drive systems reference this thyristor?
Rockwell historical spare-parts documents list it for Reliance Electric AutoMax DPS and FlexPak 3000 configurations.
Is the 122.93.02 still manufactured?
Available product records state that it was discontinued effective January 1, 2015. It is therefore primarily relevant to legacy equipment maintenance and replacement sourcing.
Can it be replaced with another 800 A SCR?
Not based on current rating alone. Voltage rating, switching characteristics, thermal requirements, press-pack dimensions and the original converter design must also be considered.
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