Siemens 3RW40 Soft Starter 34 A, 230 V, N1 Enclosure
Key Specifications (73DR32BFA)
| Parameter | Value |
|---|---|
| Control / Drive Type | Soft Start / Stop |
| Current Rating | 34 A |
| Motor Type | AC Motor |
| Mounting Type | Chassis Mount |
| Operating Temperature | 20°C ~ 40°C |
| Number of Motors | 1 |
| Encapsulation | Box |
| Product Status | Active |
| RoHS Compliance | Non-compliant |
The title decodes to a 10 HP, 34 A, 230 V device in a N1 (general purpose) enclosure. The 3RW40 family is Siemens' enclosed soft-start portfolio within the Sirius motor-management line. The chassis-mount form factor implies direct motor-branch connection rather than a separate control-cabinet installation.
Functional Overview
The soft-start topology provides reduced-voltage motor ramping on startup and controlled deceleration on stop. This is distinct from variable-frequency drives that regulate speed throughout normal operation. The device supports one AC motor per unit at the stated current rating and temperature range. RoHS non-compliance indicates older construction baseline; procurement should confirm against current project requirements.
In-Catalog Comparison (Screening Only)
| MPN | HP Rating | Current | Voltage | Enclosure | Similarity |
|---|---|---|---|---|---|
| 73DR32BFA | 10 HP | 34 A | 230 V | N1 | seed |
| 73DR34BFA | 25 HP | 34 A | 460 V | N1 | 0.70 |
| 73DR34DFA | 25 HP | 34 A | 460 V | N3R | 0.70 |
| 73DR34EFA | 25 HP | 34 A | 460 V | N4P | 0.70 |
The three alternates share identical output current and soft-start architecture but differ in voltage class and enclosure rating. The 230 V seed targets different supply infrastructure than the 460 V alternates. All require independent qualification against specific motor and installation requirements.
Soft Starter Selection Considerations
- Voltage class must match the available supply and motor nameplate.
- Current rating should accommodate locked-rotor inrush with adequate margin.
- Enclosure type (N1 / N3R / N4P) affects environmental rating; N3R provides rain protection, N4P adds dust exclusion.
- Operating temperature band of 20°C to 40°C constrains installation environment.
- RoHS non-compliant status may affect replacement or retrofit projects with environmental mandates.
FAQ
What motor horsepower does the 73DR32BFA support? The title specifies 10 HP at 230 V, 34 A.
Can the 73DR34BFA replace the 73DR32BFA? The alternates share the same soft-start architecture and output current but operate at 460 V rather than 230 V. Voltage mismatch makes direct interchange inappropriate without confirmed compatibility with the target supply system.
What enclosure type is the 73DR32BFA? The N1 designation indicates general-purpose enclosure per the part title and catalog record.