Siemens 3RT23162BB40 Contactor
3RT2316 Series — S00 Frame, 18 A, DC Coil
The 3RT2316 base number identifies the Siemens SIRIUS S00 line of electromechanical contactors. The "BB40" suffix designates a 24 VDC coil with four normally-open main poles. The suffix structure across this series encodes coil voltage and construction variant; the "BB" block consistently maps to DC operation while trailing digits indicate control voltage tier.
Coil draw at pickup reaches 166.7 mA, yielding 4 W holding power against 144 Ω measured resistance. Pickup threshold sits at 19.2 VDC — 80% of nominal coil voltage, matching common DC relay design margins.
Contact Arrangement and Ratings
| Spec | Value |
|---|---|
| Contact Form | 4PST-NO (4 Form A) |
| Contact Rating | 18 A |
| Mounting | Chassis Mount, DIN Rail |
| Encapsulation | Bulk |
Four independent Form A contacts serve as main power poles. "Auxiliary Contacts" noted in features indicates integral auxiliary blocks for control-circuit feedback — typical for motor-starter and power-distribution use. The bulk packaging reflects production-quantity orientation rather than retail blister packaging.
Coil Electrical Summary
| Parameter | Value |
|---|---|
| Coil Voltage | 24 VDC |
| Coil Power | 4 W |
| Coil Current | 166.7 mA |
| Coil Resistance | 144 Ω |
| Must Operate Voltage | 19.2 VDC |
DC coils on Siemens S00 contactors exhibit higher inrush than equivalent AC units; the 4 W figure reflects holding-state consumption after initial energization. Panel designers should account for supply capacity during coil energization transients.
Compare — DC Coil Variants in 3RT2316 Series
The reader must qualify the following alternates independently for specific application requirements.
| Spec | 3RT23162BB40 (seed) | 3RT23162BF40 | 3RT23162BM40 |
|---|---|---|---|
| Coil Voltage | 24 VDC | 110 VDC | 220 VDC |
| Must Operate | 19.2 VDC | 88 VDC | 176 VDC |
| Contact Rating | 18 A | 18 A | 18 A |
| Mounting | Chassis, DIN Rail | Chassis, DIN Rail | Chassis, DIN Rail |
| Encapsulation | Bulk | Box | Box |
| Similarity | — | 1.0 | 1.0 |
- 3RT23162BF40: 110 VDC coil — same contact rating and mounting. The higher control voltage reduces coil current to approximately 36 mA at holding; suited for DC distribution systems where 24 V is unavailable.
- 3RT23162BM40: 220 VDC coil — identical contact and mounting specs. Matches common 220 VDC bus architectures found in telecom infrastructure and some industrial DC networks.
- 3RT23161BB40: Shares all electrical parameters with the seed; the trailing "1" in the 8th character reflects a minor construction revision within the same family — verify interchangeability with the target equipment's dimensional and connector requirements.