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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesElectrical Planning & InstallationZofingenErhard Keller AG
Erhard Keller AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Erhard Keller AG is an electrical company that provides electrical installations for industrial, commercial, service and residential buildings, and offers lighting solutions, communication networks and smart home systems.

AI-generated
Offering

Products & services

Industry:Electrical Planning & Installation
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Erhard Keller AG

✓ Offered8
Electric power
Electrical installations in industrial, commercial, services and residential buildings; new builds, conversions, renovations, service, equipment sales, electrical installations, power installations, low-voltage installations, distribution boards, household appliances, maintenance and repairs.
Lighting
Lighting installations for private, commercial and industrial applications; LED lighting, indirect luminaires, lighting systems, outdoor lighting, lighting consulting, lighting planning, installation, commissioning, renovation and intelligent lighting controls.
Communication
Communication solutions and IT networks; consulting, conception, implementation, documentation, sales, installation, maintenance and repair of communication systems as well as cabling up to the end devices.
Smart home
Connected building technology for luminaires, push buttons and devices; comfort solutions for home technology and household appliances, internet and app control, individual lighting controls, shutter controls, Zeptrion, KNX and Sonos.
Immediate assistance
Service and repair service for electrical problems; устран/ fixing power outages, malfunctions and defects, replacement of components and swapping, reachable by telephone during the specified service hours.
Inspection and safety
Periodic inspections of electrical installations; preparing safety certificates SiNa, checking system components, carrying out measurements and rectifying defects.
Telephone and Internet
Provisioning of IP connections; formalities for new connections or switching, commissioning of the connections as well as configuration of telephone, internet, TV and PC end devices.
Engineering
Electrical engineering for building installations; neutral estimating, consulting and planning of electrical systems, lighting designs, communication and IT systems, building automation, operating and cost optimisation, load and power quality measurements, expert assessments.
Trust & reputation

ranQ Trust Score of Erhard Keller AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 100% · As of October 2026

Erhard Keller AG scores 84.4 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.82.424%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.80.810%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.95.08%
Erhard Keller AG scores 92.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.82.07%
Erhard Keller AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
Erhard Keller AG scores 10.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.20.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.0.04%
Qualifications+0.00

Erhard Keller AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 23 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.8
of 5

Aggregated from 23 reviews across all connected sources

Sources
GGoogle4.823
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

February 3, 2026Media
«Lieber jetzt noch profitieren und sparen» – kurzfristiger Boom wegen Abschaffung des Eigenmietwerts
zofingertagblatt.ch

Knowledge

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Comparisons

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Location

Untere Brühlstrasse 34
4800 Zofingen
Opening hours
Mon
07:00 - 12:00, 13:15 - 16:30
Tue
07:00 - 12:00, 13:15 - 16:30
Wed
07:00 - 12:00, 13:15 - 16:30
Thu
07:00 - 12:00, 13:15 - 16:30
Fri
07:00 - 12:00, 13:15 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-100.911.221
Founded
2003 · 23 years
Last commercial register change
November 22, 2024
Employees
21 to 50
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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