6SE7031-6ES87-2DC0 Siemens 100 kW braking resistor

Siemens identifies 6SE7031-6ES87-2DC0 as a SIMOVERT MASTERDRIVES 100 kW, 4 ohm braking resistor in the braking-energy path.

System function and position

Rebuilt from individual evidence

Unknown: evidence boundary

Siemens identifies 6SE7031-6ES87-2DC0 as a SIMOVERT MASTERDRIVES braking resistor for 100 kW and 4 ohms.

The braking-unit manual places this resistor in the braking-energy path and lists an approximate weight of 45 kg.

At system level, it receives braking energy from the MASTERDRIVES DC link and dissipates it outside the inverter stage; this position is an explicit inference from the cited facts.

Unknown: the individual unit's condition, mounting, thermal environment, wiring, and current commercial status.

Exact reference: 6SE7031-6ES87-2DC0
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 braking energy into heat in the SIMOVERT MASTERDRIVES braking path.
System position: Sits within the braking-energy path associated with the MASTERDRIVES DC link and outside the inverter stage.
Upstream / inputs: Receives braking energy from the MASTERDRIVES DC-link braking circuit.
Downstream / outputs: Converts the received braking energy into dissipated heat at the resistor.
Limitations: Unknown: the individual unit's condition, mounting, thermal environment, wiring, and current commercial status.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens identifies 6SE7031-6ES87-2DC0 as a SIMOVERT MASTERDRIVES braking resistor for 100 kW and 4 ohms.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
The Siemens braking-unit manual places this resistor in the braking-energy path and lists an approximate weight of 45 kg.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: receives braking energy from the MASTERDRIVES DC link and dissipates it outside the inverter stage.
Confidence: medium
Rationale: The manual identifies the exact resistor and its braking-unit context; the energy-flow position is an explicit engineering inference.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the individual unit's condition, mounting, thermal environment, wiring, and current commercial status.
Confidence: low
Missing evidence: The individual lookup did not inspect a unit or establish its mounting, wiring, thermal environment, or commercial status.

System position diagram

The MASTERDRIVES DC link sends braking energy through 6SE7031-6ES87-2DC0 braking resistor to dissipated braking heat. — Evidence-supported conceptual system position for 6SE7031-6ES87-2DC0; this is not a wiring or safety instruction.

View Mermaid source

flowchart LR
  link["MASTERDRIVES DC link"] --> resistor["6SE7031-6ES87-2DC0 braking resistor"]
  resistor --> heat["Dissipated braking heat"]

View diagram labels

Nodes: MASTERDRIVES DC link; 6SE7031-6ES87-2DC0 braking resistor; Dissipated braking heat
Edges: braking energy; dissipation

Next action

Use the documented 100 kW, 4 ohm braking-resistor role as the evidence-supported starting point and verify the installed braking circuit before service.

Unknown: confirm the individual unit's condition, mounting, thermal environment, wiring, and current commercial status before service or replacement.

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