Okay, let's break down the situation and explore potential solutions to the failed shunt trip on the Square D QOM2200VH1021.

Understanding the Problem Failed Shunt Trip

The core issue is that the shunt trip mechanism within the QOMain breaker is not working. There's no electrical continuity through the shunt trip coil.

Warranty Expiration

The breaker is beyond the 18-month warranty period offered by Square D for their QOMain breakers, even though standard QO breakers have a lifetime warranty.

Costly Replacement

A new QOM2200VH1021 breaker is expensive, around $600+.

Possible Causes of Shunt Trip Failure

Without hands-on testing, here are some possibilities for a failed shunt trip:1. Overheating

Shunt trip coils are sensitive to overheating. If the breaker has been subjected to excessive heat (e.g., high ambient temperatures, overloaded connections), the coil could have burned out.2.

Voltage Spikes/Surges

Power surges or voltage spikes on the shunt trip circuit itself could damage the coil.3.

Mechanical Failure

Although less common, there could be a mechanical failure within the shunt trip mechanism itself, preventing the plunger from moving to trip the breaker.4.

Manufacturing Defect

While unlikely, a defect in the shunt trip from the factory could lead to premature failure.5.

Improper Wiring/Connection

While you tested it in April, if the wiring was incorrect after re-wiring it, too much current could have damaged the shunt trip.

Troubleshooting Steps (If Possible/Safe) Visual Inspection

Carefully inspect the breaker (especially the shunt trip terminals and area around the mechanism) for any signs of physical damage, discoloration, or burning. Be extremely cautious and ensure the breaker is de-energized before any visual inspection.



Confirm Voltage Rating

Double-check that the voltage being applied to the shunt trip coil matches the coil's specified voltage. Supplying too much voltage will destroy it.

Remove and Test the Shunt Trip Circuit Wiring

Make absolutely sure there isn't a short circuit in the wiring to the shunt trip. A shorted wire could present as a failed coil. Disconnect the shunt trip wires from the breaker and test the wiring (with the power off!) for shorts to ground or between conductors.

Gentle Manipulation (Handle with care!)

Only if you are comfortable and qualified to do so, and with the breaker de-energized, you could try very gently manipulating the shunt trip reset mechanism (if there is one) to see if anything feels jammed or binding. Do not force anything.
Possible Solutions and Options1.

Negotiate with Square D

Contact Square D again and explain the situation, emphasizing that the breaker failed relatively soon after installation and that the shunt trip is critical for safety. Politely inquire if they might offer some assistance or a discount on a replacement, even though the warranty has technically expired. Escalate the conversation if necessary to a higher level of customer service or a field service representative.2.

Third-Party Repair (Proceed with Caution)

Search for reputable electrical equipment repair shops in your area that specialize in circuit breaker repair. However, understand that modifying or repairing a breaker outside of the manufacturer's authorized channels can void any remaining warranty or certifications. Also, consider the potential liability if the repaired breaker fails in the future.3.

Used/Refurbished Breakers (Buyer Beware)

Explore the option of purchasing a used or refurbished QOM2200VH1021 breaker from a reputable supplier. This can be a cost-effective solution, but it comes with inherent risks. Make sure the supplier offers a warranty and that the breaker has been properly tested and inspected. Check the reputation and return policy of the seller.4.

Consider a Different Shunt Trip Method (If Feasible)

Evaluate whether there are alternative ways to achieve the desired emergency stop functionality. Is this shunt trip being used as a main disconnect for a panel? If so, would it be possible to use the breaker without a shunt trip and install a separate main disconnect with a shunt trip instead?5.

Emergency Purchase

It's important to have the breaker working and the shunt trip online. So maybe look at buying a new one right away.

Important Considerations

Safety

Always prioritize safety when working with electrical equipment. Ensure the breaker is de-energized before any inspection or troubleshooting. Use proper personal protective equipment (PPE).

Qualifications

Only qualified and experienced electricians should perform testing or repair work on circuit breakers.

Code Compliance

Ensure that any repairs or replacements comply with all applicable electrical codes and regulations.

Documentation

Keep detailed records of all troubleshooting steps, repairs, and replacements.

Recommendation*Start by contacting Square D again and trying to negotiate. A polite but firm approach, highlighting the safety aspect and the relatively short time since installation, may yield some results. Then, explore the local repair shops. Make sure to purchase and install a replacement either way.Good luck! Flag for review