Circuit Breaker Schematics
BETA Module. Quick access to essential control drawings for circuit breakers.
Premium
Circuit Breaker Terms & Definitions
Dynamic quick reference of over 150 circuit breaker terms and acronyms.
Launch
Contact Resistance DB
Compare contact-resistance to real world values submitted by TestGuy members.
Premium
Digitrip GF Pickups
Find expected Ground Fault pickup values for most Cutler-Hammer/Westinghouse Digitrip RMS trip units.
Launch
Low-Voltage Circuit Breaker Test
Electronic form for testing low-voltage power circuit breakers in accordance with NETA standards.
Premium
MVA Calculator
Find MVA rating of a circuit breaker using nameplate ratings.
Launch
Trip Unit TCC Calculator
Generate test currents and generic trip times for LSIG trip units, includes tolerance for pickup and time values.
Premium
Vacuum Circuit Breaker Test
Electronic form for testing medium-voltage vacuum circuit breakers in accordance with NETA standards.
Premium
Need something else?  Explore

Powerful Testing Tools. All in One Place.

With the TestGuy Pro Dashboard, you get access to our entire suite of software tools and references.

Get Premium Access

Already a subscriber? Access premium modules with your existing TestGuy Pro Account

Optimized for Mobile

No extra software to install and nothing to keep updated. All of our tools run directly in your web browser - on nearly any device!

Get Started Today

Subscription Options

With a Pro account, you get access to the best of TestGuy and lifetime updates.
  • Monthly: $11.99/mo
  • Quarterly: $9.99/mo
  • Annually: $8.88/mo
Subscribe