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4RB12503EJ508K
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4RB12503EJ508K
SIEMENS
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4RB12503EJ508K - 25 kVAR Power Capacitor, 480V AC, 50 Hz, 3-Phase - Siemens

Cat No. 4RB12503EJ508K
Category Capacitors
Stock In Stock
Condition Brand New, Sealed Packaging
Product Type Capacitors

In Stock — 28 Qty

Quantity Expected Delivery
28 Units 25 Business Days

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Technical Documents

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Technical Specification

SIEMENS 4RB12503EJ508K Capacitors Technical Specification

Capacitors
Duty Heavy Duty
Phase 3
Rated Voltage 480Vac
Rating Kvar 25
Type Cylinderical Type

Product Details

Siemens 4RB12503EJ508K - 25 kVAR Power Capacitor, 480V AC, 50 Hz, 3-Phase. We are dedicatedly involved in providing an excellent quality products at Electrihub.

Product Dimensions

SIEMENS 4RB12503EJ508K dimensions and weight

Dimensions (L × W × H)
Length 29 cm
Width 13.2 cm
Height 13.1 cm
Weight
Net Weight 2.4 kg

Dimensions are approximate. For precise dimensional drawings, contact us.

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Product Overview

Siemens 4RB12503EJ508K - 25 kVAR Power Capacitor, 480V AC, 50 Hz, 3-Phase. We are dedicatedly involved in providing an excellent quality products at Electrihub.

Frequently Asked Questions for 4RB12503EJ508K

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.
The SIEMENS 4RB12503EJ508K is an industrial 3-phase power factor correction capacitor rated at 25.0 kVAr at 480V AC, 50 Hz. Built in a SIECAP Super Heavy Duty (SHD) Cylindrical Aluminum Can with an M12 bottom threaded mounting stud, it draws a nominal rated current of approximately 30.07 A. Engineered specifically for the Indian electrical environment, it complies rigorously with Indian Standards IS 13340 / IS 13341 as well as international standards IS/IEC 60831-1 and IS/IEC 60831-2. It carries BIS certification and is designed for continuous duty in ambient temperatures up to 55°C (Temperature Class D), accommodating ambient temperature spikes common in Indian panel enclosures. Electrihub India supplies this genuine SIEMENS unit with full manufacturer test certificates.
In Indian low voltage power distribution, the nominal line-to-line grid voltage is 415V at 50 Hz. The SIEMENS 4RB12503EJ508K is specifically designed for 7% (189 Hz) detuned reactor-filtered APFC panels on 415V 50 Hz Indian systems. The 480V rating is critical for handling non-linear loads like UPS, DC drives, and induction heaters commonly used across Indian industrial hubs. Direct connection at 415V yields ~18.68 kVAr [25 × (415/480)²], whereas in combination with an engineered 7% detuned reactor, the combination provides a net clean stage capacity of ~22.3 kVAr at 415V without risk of parallel resonance. This elevated voltage ceiling protects the capacitor against continuous grid overvoltages and harmonic voltage distortion, preventing nuisance tripping, dielectric breakdown, and loss of capacitance.
The SIEMENS 4RB12503EJ508K utilizes self-healing metallized polypropylene (MPP) film with heavy zinc-alloy edge-thickened metallization and wavy-cut geometry to minimize dielectric stress and optimize current carrying capability. For fail-safe protection, it incorporates an integrated 3-phase tear-off overpressure disconnector mechanism that mechanically disconnects all internal winding elements simultaneously in the event of internal fault gas pressure buildup, preventing case explosion or rupture. Furthermore, as mandated by Indian standards, it includes pre-fitted ceramic discharge resistor modules that safely bleed down residual voltage from peak to less than 50V within 60 seconds of de-energization, ensuring complete operator safety during panel maintenance.
Integrating the SIEMENS 4RB12503EJ508K into Automatic Power Factor Correction (APFC) panels enables Indian industrial and commercial facilities to achieve near-unity power factor (0.98 to 0.999), directly eliminating severe DISCOM low-power-factor surcharges and maximizing kVAh billing incentives enforced by state utilities (such as MSEDCL, TANGEDCO, UPPCL, BESCOM, and Torrent Power). For reliable switching, each 4RB12503EJ508K step must be controlled via dedicated capacitor-duty contactors with pre-charging damping resistors (such as Siemens 3TS series or Schneider TeSys LC1D•K) or thyristor switching modules for high-speed dynamic loads. APFC panel builders should ensure minimum 30 mm phase-to-phase separation, vertical mounting orientation, and adequate louvers or exhaust fans to keep internal enclosure temperatures within allowable limits.
Electrihub India (electrihub.in) is India's leading specialized B2B electrical e-commerce platform for genuine switchgear, power quality, and automation products. When sourcing the SIEMENS 4RB12503EJ508K through Electrihub India, buyers receive 100% brand-new, factory-sealed products directly traceable to authorized manufacturer channels, backed by full manufacturer warranty. Electrihub India provides GST-compliant tax invoices enabling full input tax credit (ITC) claims, competitive wholesale B2B pricing, in-house technical sizing assistance for APFC systems, and pan-India express doorstep delivery across all industrial hubs including Delhi-NCR, Mumbai-Pune, Chennai, Bengaluru, Ahmedabad, Hyderabad, and Kolkata.

Reviews & Ratings

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Gregory Ortiz Sep 18, 2026

Electrihub.com has become our primary portal for industrial switchgear and automation components. Sourced the SIEMENS 4RB12503EJ508K capacitor at a significantly better price than our local distributor, with zero compromise on product authenticity. Excellent procurement experience from start to finish.

Noah Reyes Sep 18, 2026

Finding genuine SIEMENS capacitors online can sometimes be tricky, but Electrihub delivered the exact 4RB12503EJ508K as cataloged. The dielectrics and overpressure disconnector mechanism meet all current industrial standards. Highly dependable platform for genuine automation components.

Louis Edwards Sep 18, 2026

As a switchgear panel builder, compact dimensions and reliable terminal mechanics are essential. The SIEMENS 4RB12503EJ508K fit directly into our standard modular capacitor cubicle. Cable lugging was clean with plenty of clearance between phases, and the bottom mounting stud provided a rigid earth return. Electrihub is our preferred source for fast component delivery.

Bruce Jackson Sep 18, 2026

International shipment of industrial switchgear can be challenging, but Electrihub handled this 4RB12503EJ508K order seamlessly. The package arrived two days ahead of schedule, completely sealed with corner protectors. Terminals and discharge resistors were intact and ready for immediate mounting.

Bradley Green Sep 18, 2026

Integrated this SIEMENS 4RB12503EJ508K capacitor into our secondary distribution switchgear. It handles continuous harmonic load without any overheating or capacitance drift. Sourcing switchgear components online can be hit or miss, but Electrihub provided authentic hardware, proper test documentation, and seamless overseas shipping.

Vikas Pandya Sep 18, 2026

Given the delicate overpressure disconnector and terminal lugs, transit safety is vital. Electrihub India did a fantastic job crating and packing the SIEMENS 4RB12503EJ508K. Received in immaculate factory condition and ready for immediate panel installation.

Ramesh Dutta Sep 18, 2026

The terminal design on the 4RB12503EJ508K allows clean dressing of 25 sq mm copper cables with ample phase-to-phase clearance. Mounted with detuned reactors without any hassle. Electrihub India provided exact dimensional data on their portal which made panel engineering effortless.

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