6SE6420 MICROMASTER 420 drive family

Documented micromaster 420 drive family function and system position for 6SE6420

Documented drive function

Rebuilt from individual evidence

Siemens uses the 6SE6420 designation for the MICROMASTER 420 inverter family.

The family occupies the motor-drive stage between an AC supply and a connected machine motor, with the exact suffix determining the electrical variant.

Exact reference: 6SE6420
Category: Drives / VFD
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Converts incoming AC power into controlled motor output for variable-speed machine operation.
System position: Sits between the incoming power supply and the motor in a variable-speed drive system.
Upstream / inputs: Receives the configured speed command and electrical power from the upstream drive circuit.
Downstream / outputs: Outputs controlled motor power and drive status to downstream machine control.
Limitations: Unknown: the installed project, wiring, firmware, operating duty, and current unit condition.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens uses the 6SE6420 designation for the MICROMASTER 420 inverter family.
Confidence: high
- mall.industry.siemens.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
Siemens MICROMASTER 420 operating instructions document 6SE6420 inverter variants, including filtered and unfiltered configurations for industrial use.
Confidence: high
- mall.industry.siemens.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

The family occupies the motor-drive stage between an AC supply and a connected machine motor, with the exact suffix determining the electrical variant.
Confidence: medium
Rationale: The exact-reference identity and documented electrical role place the unit in the stated drive-system position.
- mall.industry.siemens.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the installed project, wiring, firmware, operating duty, and current unit condition.
Confidence: low
Missing evidence: An installed-system inspection and compatibility record were not available in the individual lookup.

System position diagram

Incoming power flows through 6SE6420 to a machine motor. — The drive converts incoming power into controlled motor output in the machine system.

View Mermaid source

flowchart LR\n  supply[Incoming power] --> drive[6SE6420]\n  drive --> motor[Machine motor]

View diagram labels

Nodes: Incoming power; 6SE6420 drive; Machine motor
Edges: Power enters drive; Controlled motor output

Next action

Use this reference when the documented drive family, electrical interface, and motor duty match the project.

Unknown: confirm the installed project, wiring, firmware, operating duty, and unit condition before integration.

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