Siemens 3RT20161BB42 S00 Contactor
Overview
In motor control assemblies, S00-format contactors like the 3RT20161BB42 are typically mounted on DIN rail or chassis within the power section of an enclosure, energizing the motor branch through the contactor's 3PST-NO main poles. The coil operates at 24VDC with a stated power draw of 4W and a must-operate threshold of 19.2 VDC. The contactor carries an auxiliary contact (1NC) built into the standard package, and ships in bulk packaging.
| Parameter | Value |
|---|---|
| Base Product Number | 3RT2016 |
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating (Current) | 9 A |
| Coil Voltage | 24VDC |
| Coil Power | 4W |
| Coil Current | 166.7 mA |
| Coil Resistance | 144 Ω |
| Must Operate Voltage | 19.2 VDC |
| Mounting Type | Chassis Mount, DIN Rail |
| Encapsulation | Bulk |
| Features | Auxiliary Contacts |
Engineering verification checklist
- Control supply is 24VDC; verify coil terminals match and wiring is sized for 166.7 mA draw.
- Motor load current does not exceed the 9 A contact rating under expected operating conditions.
- Required auxiliary function is 1NC; confirm this contact configuration is compatible with the control scheme.
- Mounting method in the enclosure is chassis mount or DIN rail; S00 format must fit the designated space.
- Must-operate voltage of 19.2 VDC provides 20% margin against nominal 24VDC; confirm supply regulation is adequate.
- Bulk packaging is acceptable for the procurement quantity and incoming inspection process.
- Overcurrent protection coordination for the motor branch (upstream OCPD rating and curves) is reviewed separately.
Similar catalog parts
Side-by-side comparison; all require the reader's own technical qualification before use in a specific circuit.
| MPN | Contact Form | Coil Voltage | Contact Rating | Must Operate Voltage | Encapsulation | Similarity |
|---|---|---|---|---|---|---|
| 3RT20161BB42 (primary) | 3PST-NO (3 Form A) | 24VDC | 9 A | 19.2 VDC | Bulk | — |
| 3RT20161BB420CC0 | 3PST-NO (3 Form A) | 24VDC | 9 A | 19.2 VDC | Box | 1.00 |
| 3RT20161BB421AA0 | 3PST-NO (3 Form A) | 24VDC | 9 A | 19.2 VDC | Box | 1.00 |
| 3RT20161BB41 | 3PST-NO (3 Form A) | 24VDC | 9 A | 19.2 VDC | Bulk | 1.00 |
| 3RT20161BB44 | 3PST-NO (3 Form A) | 24VDC | 9 A | 19.2 VDC | Box | 1.00 |
3RT20161BB41 shares the same base product number, identical coil voltage, current rating, and must-operate voltage. It also ships in bulk encapsulation. The auxiliary contact arrangement may differ; check the full ordering description for 1NC vs. other configurations.
3RT20161BB44 matches on base product number, voltage class, and contact current rating. The auxiliary contact arrangement is listed as 2NO/2NC (four contacts total), offering expanded auxiliary flexibility compared to the 1NC in 3RT20161BB42. Operate time and temperature range (25°C to 60°C) are on record for this variant.
3RT20161BP42 diverges in coil voltage: 230VDC with a must-operate voltage of 184 VDC. This is a different voltage class, not a drop-in replacement at 24VDC. The base product number and main contact rating (9 A) remain consistent.