4AM3442-8DD40-0FA0 Siemens SITAS control transformer

Clean-room evidence identifies 4AM3442-8DD40-0FA0 as Siemens SITAS control transformer. The Siemens data sheet identifies the exact reference as a one-phase SITAS transformer with 100 VA rated apparent power and 310 VA short-term power.

Documented identity and function

Rebuilt from individual evidence

System position

The Siemens data sheet identifies the exact reference as a one-phase SITAS transformer with 100 VA rated apparent power and 310 VA short-term power.

The data sheet lists selectable 208-550 V primary taps, 230 V or 115 V output, 0.435-0.87 A secondary current, 50-60 Hz operation, IP00, and screw or DIN-rail mounting.

The system path is inferred as the selectable 208-550 V primary distribution, then 4AM3442-8DD40-0FA0, then the 230 V or 115 V control circuit.

Unknown: installation compatibility, configuration, and unit condition are not established by the captured sources.

Exact reference: 4AM3442-8DD40-0FA0
Category: PLC / CPU
Evidence checked: 2026-09-11

System role

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

Function: The SITAS control transformer converts a selectable primary supply to an isolated single-phase control supply.
System position: It intervenes between the selectable 208-550 V primary distribution and the 230 V or 115 V control circuit in the documented system path.
Upstream / inputs: Inputs or upstream: the selectable 208-550 V primary distribution.
Downstream / outputs: Outputs or downstream: the 230 V or 115 V control circuit.
Limitations: Unknown: installation compatibility, configuration, and unit condition are not established by the captured sources.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The Siemens data sheet identifies the exact reference as a one-phase SITAS transformer with 100 VA rated apparent power and 310 VA short-term power.
Confidence: high
- www.mouser.com — retrieved 2026-09-11; high confidence
The data sheet lists selectable 208-550 V primary taps, 230 V or 115 V output, 0.435-0.87 A secondary current, 50-60 Hz operation, IP00, and screw or DIN-rail mounting.
Confidence: high
- www.mouser.com — retrieved 2026-09-11; high confidence
- static.mercateo.com — retrieved 2026-09-11; high confidence

Inferences

Inferred system position: 4AM3442-8DD40-0FA0 intervenes between the selectable 208-550 V primary distribution and the 230 V or 115 V control circuit.
Confidence: medium
Rationale: The exact-reference sources identify the component function and its connected interfaces; the intervening system position is an inference from those facts.
- www.mouser.com — retrieved 2026-09-11; high confidence
- static.mercateo.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: installation compatibility, configuration, and unit condition are not established by the captured sources.
Confidence: low
Missing evidence: No captured source provides the receiving system configuration, firmware, wiring, or unit condition.

System position diagram

Diagram showing 4AM3442-8DD40-0FA0 between the selectable 208-550 V primary distribution and the 230 V or 115 V control circuit. — System path inferred from the documented function of 4AM3442-8DD40-0FA0.

View Mermaid source

flowchart LR
  U["Upstream"] --> P["4AM3442-8DD40-0FA0"]
  P --> D["Downstream"]

View diagram labels

Nodes: Upstream: the selectable 208-550 V primary distribution; Device: 4AM3442-8DD40-0FA0; Downstream: the 230 V or 115 V control circuit
Edges: The upstream path feeds 4AM3442-8DD40-0FA0.; 4AM3442-8DD40-0FA0 feeds the downstream path.

Next action

Publishable as a clean-room evidence record for 4AM3442-8DD40-0FA0; verify the installation against current documentation.

Confirm voltage, wiring, accessories, and service condition against the installation before substitution.

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