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Siemens Auxiliary Switch: 1NO/1NC, Side Mount - Siemens Auxiliary Contacts
SiemensSiemens Auxiliary Contacts

Siemens Auxiliary Switch: 1NO/1NC, Side Mount

The SIEMENS Auxiliary Switch (MPN 3RH1921-1KA11) is a side-mounted auxiliary contact block with a 1NO/1NC contact configuration, designed for Frame Size S0. It is compatible with the SIRIUS 3RT1 contactor series…

SKU 3G-OTH-38217

Brand
Siemens
Item
Auxiliary Switch: 1NO/1NC, Side Mount
Category
Siemens Auxiliary Contacts
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Technical Specifications

Siemens
Manufacturer Part Number
3RH1921-1KA11
Frame Size
S0
Compatible with Series
SIRIUS 3RT1 Contactors
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS Auxiliary Switch (MPN 3RH1921-1KA11) is a side-mounted auxiliary contact block with a 1NO/1NC contact configuration, designed for Frame Size S0. It is compatible with the SIRIUS 3RT1 contactor series, providing additional switching functionality for industrial control applications.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens siemens auxiliary contacts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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