Troubleshooting

Circuit breaker trips

Check the electrical load and ensure that the sensors do not exceed the 10 Amp maximum.
Check each wire for damage that may lead to a short. Replace any damaged cables.

Check the breaker and be sure it is in the ON position.
Check the tightness of electrical connections along the power supply cable. Tighten any loose connections.
Use a volt meter to measure voltage at the power supply and at the power distribution box. Be sure that the power distribution box has sufficient power provided to it. Long cable runs can result in a voltage drop, which can be solved by using a heavy gauge wire.
Check wires/DIN terminal clasps to be sure that they are installed properly. Be sure the clasp is not closed on insulation and that the conductive wires are installed in the proper opening on the DIN terminals and breaker.
Be sure the power supply is adequate to operate the entire system, including the startup load.

Check the electrical connections to the unpowered sensor. It is possible that the power cable was inserted too far and the electrical terminal closed on the insulation rather than the conductor.
Measure the voltage at the sensor power cable to ensure that power is delivered. Replace the cable if needed.
Be sure the power supply is sufficient to provide start-up power required for each sensor in the system.
Test the sensor using an alternative power source to ensure that the sensor operates properly.

This may result from voltage drop over the power supply wires. Measure the voltage at the power source and at the end of the power supply wires. If there is a difference > a few volts, shorten the power cable length to minimize voltage drop, increase the wire gauge, or increase the voltage supplied (using caution to avoid exceeding the voltage limit of the system components).
Short or bad connection in power supply wires. Be sure the connections are tight and that there is no damage to cables.
Underpowered solar supply. If a solar power supply is drawn down excessively, it will not supply enough power to keep the system running and instruments will power off.