You're asking some good questions about GFCI protection for a 240V car charger with no neutral requirement. Let's break it down

1. GFCI Breaker Operation Without a Neutral Connection (and Ground/Neutral Bond)
Correct... BUT HIGHLY DISCOURAGED: In theory, a 240V GFCI breaker might trip if the ground and neutral bars are bonded in the panel and there's a ground fault. The fault current would flow back through the grounding conductor to the ground bar, then to the bonded neutral bar, and then back to the service transformer via the neutral conductor. The GFCI could detect this imbalance between the two hot legs and trip. However, Relying on this is DANGEROUS and AGAINST CODE

This is

NOT how GFCI breakers are intended to operate, and it's a very poor safety practice. There are several reasons why this is a bad idea: Unreliable

The GFCI might not always trip reliably or quickly enough. The impedance of the ground path could be too high, limiting the fault current.

Voltage on Ground

A ground fault could energize the grounding system before the GFCI trips, creating a shock hazard.

Code Violations

This setup likely violates electrical codes.

Equipment Damage

The fault current, even if brief, can damage equipment.

Nuisance Tripping

It can be more prone to nuisance tripping.

2. Neutral Redundancy (for 240V No-Neutral Chargers) Yes, the NEUTRAL IS Redundant if the CHARGER requires no neutral It is not needed and should not be run to the disconnect. WHY

A 240V, 3-wire charger (two hots and a ground) operates on a balanced load between the two hot legs. The current going out on one hot leg returns on the other. A GFCI monitors this balance. If there's a significant difference (a fault current leaking to ground), it trips. Since the charger uses no neutral current, there's no imbalance the GFCI needs to monitor related to the neutral.

3. Correct GFCI Implementation for a 240V, 3-Wire Charger Use a 2-Pole GFCI Breaker

This is the correct solution. A 2-pole GFCI breaker is designed to monitor the current balance between the two hot legs of a 240V circuit.

Run 2 Hot Wires and a Ground

Connect the two hot wires to the appropriate terminals on the GFCI breaker and the charger. Connect the ground wire to the ground bar in the panel and to the grounding terminal in the charger.

IMPORTANT - READ THE BREAKER INSTRUCTIONS CAREFULLY. Follow the EXACT installation instructions that come with your GFCI breaker. Some have very specific wiring requirements.* DO NOT CONNECT THE NEUTRAL WIRE AT ALL AT THE CHARGER IF IT IS NOT REQUIRED.Summary and Recommendations


Do NOT Rely on a Bonded Neutral/Ground for GFCI Protection

This is unsafe, unreliable, and likely code-violating.2.

Use a Dedicated 2-Pole GFCI Breaker

Install a proper 2-pole GFCI breaker designed for 240V circuits.3.

3-Wire Configuration

Run two hot wires and a ground wire. The neutral wire from the panel should not be connected if the charger doesn't require it.4.

Consult a Qualified Electrician

This is essential! Electrical work can be dangerous. A qualified electrician can ensure the installation meets code and is safe. Have them review your specific charger's requirements and the GFCI breaker instructions.

In short: Ditch the idea of relying on a bonded neutral/ground for GFCI tripping. Get a proper 2-pole GFCI breaker and have it installed by a professional. Flag for review