Breaker Testing
480V Breaker - Primary Injection
Practice a detailed 480V breaker primary-injection sequence after the real-world LOTO/live-dead-live hold point: settings documentation, per-phase long-time, short-time, instantaneous, and ground-fault pickup/trip checks.
Record trip unit settings and close for current path
After the real-world LOTO and live-dead-live safety hold point is complete, select the primary injection set, record as-found settings, close the breaker in the test position, set cooldown ready, and choose through-pole return.
Current Objective
Record trip unit settings and close for current path
A tech photographs the trip unit, writes the sensor/rating plug, confirms the mechanical trip path, verifies de-energized condition per site procedure, then closes the breaker to create a current path.
Why
Pickup and trip results only mean something when compared to the trip unit settings and the approved coordination study. Live-dead-live is still required in the field, but it is not scored as a simulator test step here.
Safety
High-current leads can jump, heat, or arc if poorly clamped. Keep people clear and use the test set interlocks.
Tip
Give thermal memory and the test set time to recover between long-time shots so one test does not contaminate the next.
Safety Hold Point
This simulator starts after the real-world LOTO and live-dead-live check. In the field, use the properly rated tester, prove it on a proving unit or known live source, test for absence of voltage, then prove it again before installing test leads.
Loadout
Test Bench
Required Now
Test Set
RequiredBreaker State
RequiredTrip Unit Settings
RequiredFunction Selector
Return Path
RequiredCooldown / Memory
RequiredSim Workbench
Lead Placement
Select a lead, then hit the highlighted target nodes.
Expected for Current Step
Current output 1: A line terminal. Current output 2 / return: A load terminal. Lead order is flexible for this check.
Animated Breaker
Route the two high-current leads through the pole or ground-return path for the selected function.
High-current test set
Current output 1 and 2 feed one pole at a time.
Breaker poles
Ground fault
Current output 1
Not placed
Current output 2 / return
Not placed
Step Checklist
Field Intel
Understand that primary injection proves the breaker, sensors, trip unit, and mechanical trip path together.
Separate pickup tests from trip-time tests so settings and curves can be explained clearly.
Run each phase deliberately instead of assuming one good pole proves the whole breaker.
Use the correct return path for ground-fault testing instead of treating it like a normal phase shot.
Document cooldown, thermal memory, settings, and resets because they change what the readings mean.
Mistakes Tracked
No mistakes yet. Good simulator runs come from correct setup, lead placement, and sequence discipline.
Readings
Correct the setup, place leads, and run the current step to generate simulated readings.
Profile History
No saved attempts yet. Completed reports show up here and on the simulator landing page.