Siemens 3RT20161HB41 Coupling Relay — S00 Frame, 24 VDC Coil
Selection Trade-offs for Siemens 3RT2016 Series
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Coil power affects control power budget: The seed at 2.8 W sits between the 1.6 W variants (3RT20161WB41, 3RT20161VB41) and the 4 W versions (3RT20161BB41, 3RT20161FB41). Lower coil draw reduces hold-in heating but often requires higher-quality DC supplies to maintain operate margins.
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Operate voltage margin determines pickup reliability: Must-operate thresholds range from 16.8 VDC (seed, KB/JB suffix) to 19.2 VDC (BB/FB) and 20.4 VDC (WB/VB). Systems running near nominal 24 VDC with significant line drop benefit from the tighter 16.8 VDC pickup margin.
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Package type affects inventory and mounting preference: Bulk packaging suits automated assembly; box packaging simplifies small-quantity procurement and field stocking. The seed ships in bulk; QB/WB/VB ship in box.
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Auxiliary contact form is fixed per variant: The HB41 and most alternates present 3PST-NO; HB42 deviates with NC configuration. Verify that the control scheme topology matches the contact form before ordering.
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Operate time variance may matter in timing-critical circuits: Specified operate times range from 100 ms (FB) to 130 ms (HB42, QB). For sequential interlocking where contact closure order matters, select accordingly.
3RT20161HB41 Primary Specifications
| Parameter | Value |
|---|---|
| Coil Voltage | 24 VDC |
| Coil Power | 2.8 W |
| Coil Resistance | 205.7 Ω |
| Coil Current | 116.7 mA |
| Must Operate Voltage | 16.8 VDC |
| Contact Rating | 9 A (3PST-NO) |
| Mounting | Chassis Mount, DIN Rail |
| Base Part | 3RT2016 |
| Encapsulation | Bulk |
The 3RT2016 base number identifies the S00 contactor frame family; the trailing character positions (HB, BB, FB, KB, JB, QB, WB, VB) encode the coil power class, auxiliary contact arrangement, and package variant. All share the same 9 A contact rating and DIN-rail mounting footprint.
Comparative Coil Data — 3RT2016 Family
| MPN | Coil Power | Must Operate | Package | Auxiliary |
|---|---|---|---|---|
| 3RT20161HB41 (seed) | 2.8 W | 16.8 VDC | Bulk | 1NO |
| 3RT20161KB41 | 2.8 W | 16.8 VDC | Bulk | 1NO |
| 3RT20161JB41 | 2.8 W | 16.8 VDC | Bulk | 1NO |
| 3RT20161QB41 | 2.8 W | 16.8 VDC | Box | 1NO |
| 3RT20161BB41 | 4 W | 19.2 VDC | Bulk | 1NO |
| 3RT20161FB41 | 4 W | 19.2 VDC | Box | 1NO |
| 3RT20161WB41 | 1.6 W | 20.4 VDC | Box | 1NO |
| 3RT20161VB41 | 1.6 W | 20.4 VDC | Box | 1NO |
Readers must validate coil data against the specific procurement drawing. The four lowest-power variants (HB/KB/JB in bulk, QB in box) share identical electrical specs; procurement may be driven by package preference or stock availability. The two 4 W variants raise pickup threshold to 19.2 VDC, reducing margin at nominal 24 VDC under load. The two 1.6 W variants push must-operate to 20.4 VDC—acceptable only where supply regulation and line drop are tightly controlled.