Siemens 3RT20152HB42 Coupling Relay
The 3RT2015 series encompasses 7 A contactors and coupling relays in the S00 frame size, all sharing 24 VDC coil operation and chassis/DIN rail mounting.
Coil characteristics differ across variants. The HB, JB, KB, and QB suffixes denote 2.8 W coil power with a 16.8 VDC must-operate threshold and 130 ms operate time. The VB and WB suffixes drop to 1.6 W with a 20.4 VDC must-operate and 120 ms. The FB and BB suffixes draw 4 W with a 19.2 VDC must-operate and 100 ms operate time. Coil current ranges from approximately 117 mA (205 Ω) at 2.8 W up to 167 mA (144 Ω) at 4 W.
Contact rating is uniform at 7 A for the main pole structure, stated as 3PST-NO (3 Form A) in the title field. All variants include auxiliary contacts and box encapsulation. Operating temperature is specified as 25°C to 60°C where recorded.
Mounting is chassis mount or DIN rail compatible across the family. The product fits standard S00 form factor footprints.
Engineering verification checklist
- Confirm coil voltage polarity and supply capacity for the selected suffix (2.8 W / 1.6 W / 4 W) before wiring
- Verify contact load against the 7 A rating for the intended load type and switching frequency
- Check must-operate voltage against available coil supply under minimum operating conditions
- Confirm DIN rail or chassis mounting orientation and torque specs for the S00 frame
- Validate auxiliary contact function if the application relies on the included auxiliary pole
- Review operate time against any timing-sensitive control sequence requirements
- Confirm enclosure ventilation or spacing does not exceed the 60°C upper limit under worst-case ambient
- Verify that the selected variant's coil resistance (if applicable) is compatible with the driving output stage