SIEMENS
SIEMENS 3RH29111NF11 Auxiliary Contact Block 1NO 1NC 690V AC
Front-mount auxiliary contact block adds one normally open and one normally closed contact rated to 690 V AC for SIRIUS 3RH2 and 3RT2 contactors
- 1 NO and 1 NC contact for flexible control circuits
- 690 V AC rating handles standard industrial voltages
- Front-mount design fits SIRIUS 3RH2 and 3RT2 contactors
- Screw terminals give secure, tool-friendly wiring
- IP20 rating protects against finger contact
Front-Mount Auxiliary Block
The SIEMENS 3RH29111NF11 auxiliary contact block adds one normally open and one normally closed contact to compatible SIRIUS contactors and contactor relays. It mounts on the front of frame sizes S00, S0, S2 and S3 as well as NEMA sizes 0 and 00. The block is rated for a maximum voltage of 690V AC and uses screw terminals for wiring. It is intended for control-circuit expansion in industrial starter assemblies.
Sustained Load Behaviour
The two contacts are rated for continuous operation at the declared 690V AC maximum without derating for short bursts. Each contact maintains its state reliably during extended duty cycles typical of motor-starting and control sequences. The IP20 rating ensures the terminals remain protected against finger contact during prolonged energised periods. No thermal overload or timing degradation is specified for the contact set under normal operating conditions.
Thermals Noise and Power Draw
As a passive electromechanical accessory the block draws no control power of its own and generates no audible noise during operation. Heat rise is limited to the contact resistance of the screw terminals carrying the control-circuit current. The IP20 enclosure prevents dust ingress that could affect long-term contact reliability. Power dissipation remains negligible compared with the main contactor coil and power poles.
Highlights
- 1 NO and 1 NC contact for flexible control circuits
- 690 V AC rating handles standard industrial voltages
- Front-mount design fits SIRIUS 3RH2 and 3RT2 contactors
- Screw terminals give secure, tool-friendly wiring
- IP20 rating protects against finger contact
Specifications
| Brand | SIEMENS |
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Questions about this item
How much heat does the 3RH29111NF11 block generate when energised continuously?
The auxiliary contact block itself produces negligible heat; the coil of the host SIRIUS 3RH2 or 3RT2 contactor determines the thermal load.
Which contactor frames must I already own to mount this 1NO/1NC block?
It snaps onto the front of SIRIUS 3RH2 contactor relays or 3RT2 contactors in frame sizes S00, S0, S2 and S3 (NEMA 00 and 0).
Will the screw terminals accept the same wire gauge I use on my older S00 contactor?
Yes, the block uses standard screw terminals compatible with the wiring practice for the SIRIUS S00, S0, S2 and S3 frames.
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