# Question – 200 Amp Main Circuit Breaker Tripping – Part 1

 My 200 amp main electrical circuit breaker trips. Should I replace it?

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Main Circuit Breaker Tripping
[ad#block]Electrical Question: Why is my main breaker tripping off?

• I have a 200A main panel which is fully utilized. I recently put in an in-ground swimming pool and a finished basement – so I put in a main lug 20 circuit 100A panel downstream to service my pool and basement.
• Everything went all right until recently my 200A main breaker occasionally trips. This happened tonight when both central air units were on, (one 4-ton unit one 2-ton unit), my pool pump (15A), and my washing machine.
• I went to the main panel and measured 19A off one leg and 45 off the other. I may try load balancing and move the 4-ton unit to the leg drawing 19A – but I can’t understand why this would trip a 200A main?
• Keep in mind that the starting amps of any motor is quite high. This is commonly called Lock Rotor Amps (LRA) and will be found on the A/C Unit Label Information. If both A/C units start at the same time and there is a moderate load in the home you may trip your main breaker.
• So how can you solve this? One option is to have a Time Delay Relay installed on one of the A/C units as to prevent both units from starting at the same time. The relay can be installed on the thermostat control voltage side of the circuit.

## 200 Amp Main Circuit Breaker Tripping

• You mentioned that you may try to balance the load of the A/C units, however they are most likely 240 Volts and should themselves be balanced.
• You can balance the panel loads by repositioning the higher 120 Volt loads onto the low reading buss.

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200 Amp Main Circuit Breaker Tripping – Part 2

200 Amp Main Circuit Breaker Tripping – Part 3

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 More articles about Main Breaker Questions and Home Electrical Wiring: « Previous Next » Question – 200 Amp Main Circuit Breaker Tripping – Part 2 Question – Troubleshooting a Dryer Plug