How do we keep the power from turning off when using wall heaters?

My hubby just replaced the 4 cadet wall heaters in our main living and kitchen/dining area, and one thermostat controls all of them. If we set the temp. Above 70, they work for a short time and then shut off, so then it's a trip to the breaker box. What did we miss? I believe he checked the wattage toatch the old ones.

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