SIEMENS
SIEMENS 3RT20171BB42 IEC Magnetic Contactor 1NC 24V DC 3P Non-Reversing
IEC magnetic contactor with 1NC auxiliary contact, 24V DC coil, 12A inductive and 22A resistive ratings, DIN-rail or surface mount
- IEC-standard contactor simplifies panel design
- 24 V DC coil enables low-voltage control circuits
- Three power poles switch motor loads up to 12 A inductive
- Compact 1.95 in height fits tight DIN-rail enclosures
- Screw terminals provide secure wiring without special tools
SIEMENS 3RT20171BB42 IEC Magnetic Contactor
This SIEMENS IEC magnetic contactor is designed for controlling three-phase motor circuits in industrial control panels. It operates on a 24V DC coil and provides a 12 A inductive and 22 A resistive full load current rating. The unit features a single normally closed auxiliary contact for feedback signalling and uses screw terminals for secure wiring connections.
Panel builders needing 24V DC coil operation
Installations requiring reversing motor control or a different coil voltage will need an alternative contactor. Applications demanding a built-in enclosure or a different auxiliary contact configuration are not served by this model. Buyers needing higher current ratings should select a larger frame size.
24V DC coil voltage with 3-pole non-reversing
The 24V DC coil determines compatibility with the control circuit power supply. The three-pole main circuit and non-reversing design define the motor control function. The 1NC auxiliary contact provides a single status indication point for the control system.
Highlights
- IEC-standard contactor simplifies panel design
- 24 V DC coil enables low-voltage control circuits
- Three power poles switch motor loads up to 12 A inductive
- Compact 1.95 in height fits tight DIN-rail enclosures
- Screw terminals provide secure wiring without special tools
Specifications
| Brand | SIEMENS |
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Questions about this item
Will the auxiliary contact block need replacement after a certain number of operations?
The contactor includes one normally-closed auxiliary contact rated for the same 12 A inductive and 22 A resistive loads as the main poles, so it shares the same electrical life expectations.
Which rating — 12 A inductive or 22 A resistive — will be reached first during continuous duty?
The 12 A inductive full-load current is the lower limit and will be reached first when driving motor or transformer loads.
How much heat does the coil produce when energised at 24 V DC all day?
The 24 V DC coil draws steady power while the contactor is held in, and the open-frame design dissipates that heat directly into the enclosure without forced cooling.
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