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$67.50
| Voltage | WPC | AH/kVA | Length | Width | Height | Weight |
|---|---|---|---|---|---|---|
| N/A | N/A | N/A | N/A | N/A | N/A | 4 |
| Voltage | N/A |
| WPC | N/A |
| Amp/H | N/A |
| Length | N/A |
| Width | N/A |
| Height | N/A |
| Weight | 4 |
The Tesla MCI-2 High Current Mid-Circuit Interrupter (1879359-15-B) forms part of the solar rapid-shutdown system in compatible Tesla installations, including Powerwall 3. It installs inline within the photovoltaic array’s DC wiring.
This version features a 15 A nominal input current rating, a 19 A maximum input short-circuit current rating, and MC4-EVO2 connectors.
Suitable for approved new installations and service replacements. This listing is for the MCI device; Powerwall equipment and solar modules are sold separately.
| Category | Detail |
|---|---|
| Manufacturer | Tesla |
| Part Number | 1879359-15-B |
| Model | MCI-2 High Current — Mid-Circuit Interrupter |
| Nominal Input DC Current (IMP) | 15 A |
| Maximum Input Short-Circuit Current (ISC) | 19 A |
| Maximum System Voltage | 1000 V DC device rating; limited to 600 V DC in Powerwall 3 systems |
| Maximum Disconnect Voltage | 165 V DC across each MCI in the open position |
| Connector Type | MC4-EVO2 |
| Control / Passive State | Power line excitation / Normally open |
| Enclosure Rating | NEMA 4X / IP65 |
| Ambient Temperature | −45°C to 70°C (−49°F to 158°F) |
A qualified installer must verify connector compatibility, PV string ratings, and the required MCI quantity and placement using Tesla’s applicable installation instructions and certified array configuration. Tesla permits a maximum of five MCIs per string. MCI-2 devices must not be plugged directly into one another.
