SIEMENS
SIEMENS 3RT20151BB41 IEC Magnetic Contactor 24V DC 3P 1NO
IEC magnetic contactor with 24 V DC coil, three poles and one normally-open auxiliary contact
- Reliable switching for 7 A inductive loads with 24 V DC coil
- Handles 18 A resistive current for power circuits
- Compact 3.08 in height fits tight panels
- DIN rail and surface mounting for flexible installation
- SIRIUS 3RT20 series delivers IEC-rated performance
SIEMENS 3RT20151BB41 Contactor
The SIEMENS 3RT20151BB41 is an IEC magnetic contactor designed for switching three-phase motor loads up to 7 A inductive or 18 A resistive. It operates on a 24 V DC coil and provides one normally open auxiliary contact for control circuit signalling. This unit suits panel builders and maintenance engineers assembling DIN-rail or surface-mounted motor starters in the SIRIUS 3RT20 series.
Sustained load behaviour
The contactor carries a continuous inductive rating of 7 A and a resistive rating of 18 A without derating for the S00 frame size. Its non-reversing design means the main contacts remain closed for the duration of the coil energisation, making it suitable for continuous-duty motor starting or heating applications where frequent reversing is not required.
IEC interface limits
Rated to IEC utilisation categories, the device switches three poles at the stated currents within the S00 frame envelope of 3.08 in height by 1.97 in width. Screw terminals accept solid or stranded conductors for both power and control wiring. The 24 V DC coil voltage fixes the control supply requirement, and the single 1NO auxiliary contact limits auxiliary circuit complexity to one signalling path.
Highlights
- Reliable switching for 7 A inductive loads with 24 V DC coil
- Handles 18 A resistive current for power circuits
- Compact 3.08 in height fits tight panels
- DIN rail and surface mounting for flexible installation
- SIRIUS 3RT20 series delivers IEC-rated performance
Specifications
| Brand | SIEMENS |
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Questions about this item
How much heat does the 7 A inductive-rated contactor produce when energised continuously?
The coil draws 24V DC and the frame size S00 design is built for industrial duty cycles, so normal panel ventilation handles the heat without extra cooling.
What external components are required to mount and wire the screw-terminal contactor?
A 24V DC supply, screw-terminal compatible wire ferrules or stripped conductors, and a standard DIN rail or surface-mount screws matching the 1.97 in width and 3.08 in height.
Will the 3-pole non-reversing contactor work with an existing IEC motor starter that uses 1NO auxiliary signalling?
Yes, the 1NO auxiliary contact and 3-pole main circuit follow IEC conventions, so it integrates directly into starters expecting that frame size S00 footprint and coil voltage.
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