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3RU21161KB008K - Thermal overload relay 9.0 - 12.5 A - Siemens
| Cat No. | 3RU21161KB008K |
| Category | Over Load Relay |
| Stock | In Stock |
| Condition | Brand New, Sealed Packaging |
| Product Type | Over Load Relay |
In Stock — 59 Qty
$54.88
| Quantity | Expected Delivery |
|---|---|
| 59 Units | 25 Business Days |
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Technical Specification
SIEMENS 3RU21161KB008K Over Load Relay Technical Specification
| Over Load Relay | |
|---|---|
| Bimetal relay Type | 3RU |
| Contactor Type | 3RT |
| Current Range | 9.0-12.5A |
| Range of Product | 3RU |
| Secondary Volt Ac | 240Vac |
| Sub Family | 3RU |
| Type | 3RT |
Product Details
Siemens 3RU21161KB008K - Thermal overload relay 9.0 - 12.5 A. We are dedicatedly involved in providing an excellent quality products at Electrihub.
Product Dimensions
SIEMENS 3RU21161KB008K dimensions and weight
Dimensions (L × W × H)
Length
10.2 cm
Width
4.9 cm
Height
8.4 cm
Weight
Net Weight
0.154 kg
Dimensions are approximate. For precise dimensional drawings, contact us.
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Product Overview
Siemens 3RU21161KB008K - Thermal overload relay 9.0 - 12.5 A. We are dedicatedly involved in providing an excellent quality products at Electrihub.
Frequently Asked Questions for 3RU21161KB008K
The SIEMENS 3RU21161KB008K is a commercial-grade Over Load Relay designed to protect three-phase AC electric motors from continuous overcurrent conditions, thermal degradation, and mechanical stalling. It operates as a Siemens SIRIUS 3RU21 thermal overload relay, optimized for Class 10 protection up to 40A/100A, featuring built-in phase failure protection, ambient temperature compensation, and manual/automatic reset selectors compatible with SIRIUS 3RT contactors. The device is engineered to comply with strict international benchmarks such as IEC/EN 60947-4-1, UL, and CSA standards, making it fully ready for integration into global power grids operating at both 50Hz and 60Hz. Procurement managers can find this authorized switchgear with global shipment support on Electrihub.com.
The SIEMENS 3RU21161KB008K Over Load Relay continuously monitors phase currents via precisely calibrated internal elements (bimetallic strips or advanced electronic current transformers). In the event of a phase failure or single-phasing condition, the relay triggers an accelerated differential trip response to prevent rapid motor winding insulation breakdown. This action mechanically shifts the auxiliary contact block, opening the contact to break the control circuit coil and closing the contact to signal a system fault, ensuring complete protection across complex global automation networks.
The SIEMENS 3RU21161KB008K is physically and electrically engineered for direct plug-in mounting to matching SIEMENS power contactor frameworks, optimizing panel space and eliminating unnecessary control wiring. It is certified for both Type 1 and Type 2 coordination schemas under short-circuit conditions when combined with appropriate molded case circuit breakers (MCCBs) or high-capacity fuses. For independent installation profiles, standalone DIN rail or panel baseplates are supported, providing global panel builders on Electrihub with maximum engineering flexibility.
The SIEMENS 3RU21161KB008K features a front-mounted current adjustment dial that allows commissioning engineers to set the precise trip threshold matching the motor's nameplate Full Load Current (FLC). The device features a user-configurable selection switch for Manual or Automatic reset modes; Manual mode requires an intentional field reset after diagnosing the overload fault, while Automatic mode allows the bimetallic components to self-cool and automatically restore the control path. Additionally, an integrated mechanical trip indicator enables swift diagnostic troubleshooting to minimize operational downtime.
Sourcing the SIEMENS 3RU21161KB008K Over Load Relay via Electrihub.com provides international industrial buyers with guaranteed product authenticity, manufacturer warranty support, and full technical datasheet compliance. Electrihub.com is optimized for global enterprise supply chains, providing competitive wholesale commercial pricing, transparent export-ready compliance documentation, bulk order capability for major infrastructure projects, and specialized engineering support to ensure seamless component coordination across all international projects.
The SIEMENS 3RU21161KB008K is a high-grade Over Load Relay engineered primarily to protect three-phase AC electric motors from damaging thermal overloads, prolonged stalled rotors, and phase imbalances. As detailed in its technical specifications, this relay operates as a SIRIUS 3RU21 thermal overload relay (Class 10, up to 40A/100A, optimized for 3RT contactors, featuring built-in phase failure protection and manual/auto reset). It is an essential component for motor control centers (MCCs) and automation panels across India, and can be procured directly with full manufacturer warranty on Electrihub.
The SIEMENS 3RU21161KB008K Over Load Relay utilizes internal bimetallic strips calibrated to bend under continuous overcurrent, heating up until they mechanically actuate the auxiliary trip contacts (95-96 NC and 97-98 NO). Additionally, it features differential tripping/travel mechanisms that provide accelerated tripping in the event of a single-phasing or phase failure condition. This prevents severe motor winding burnouts, making the 3RU21161KB008K exceptionally reliable for unpredictable power grids in Indian industrial zones.
The SIEMENS 3RU21161KB008K is structurally and electrically optimized for direct plug-in mounting to matching SIEMENS power contactors (such as the standard industrial starter ranges), creating a compact and rigid direct-on-line (DOL) or Star-Delta starter assembly. For standalone applications or independent panel mounting, it can be attached to an independent DIN rail or base plate adapter using standard screw terminals, ensuring flexible integration inside electrical panels sourced via Electrihub.in.
The SIEMENS 3RU21161KB008K features a front-accessible, adjustable dial that allows panel engineers to precisely set the current trip threshold matching the motor's full load current (FLC). It also includes a versatile user-selectable reset button supporting both 'Manual' reset (requiring field maintenance intervention after a fault verification) and 'Automatic' reset modes. A mechanical trip indication indicator is integrated to speed up diagnostics during maintenance cycles.
Electrihub is India’s leading B2B e-commerce platform for authorized industrial switchgear and automation components. When purchasing the SIEMENS 3RU21161KB008K Over Load Relay through Electrihub.in, buyers receive 100% genuine products, full compliance with GST tax invoicing, access to bulk commercial discount schemes, rapid logistics to major industrial hubs, and dedicated technical customer support for complex switchgear coordination challenges.
Yes. RAS Electrihub Private Limited operates as an ISO-certified organization, ensuring quality sourcing, authentic products, and standardized procurement and delivery processes.
Yes. RAS Electrihub Private Limited issues GST-compliant invoices and also supports PO-based invoicing for businesses, contractors, and organizations across India.
Yes. RAS Electrihub Private Limited provides PAN India delivery with reliable logistics, safe packaging, and doorstep delivery across all states and union territories.
Reviews & Ratings
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Exactly what our facility needed. The 3RU21161KB008K is reliable, robust, and priced fairly on the Electrihub website. Will definitely reorder from them.
This SIEMENS 3RU21161KB008K provides precise protection. Electrihub delivered a brand new, factory-sealed unit. Very professional service all around.
Standard high quality from SIEMENS. The 3RU21161KB008K overload protection relay fits perfectly and works without issues. Great service from RAS Electrihub.
Got the SIEMENS 3RU21161KB008K delivered on time for our project breakdown. RAS Electrihub saved us a lot of downtime. Quality is top-notch.
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