Mini Split Wire Size & Circuit Breaker Chart

Use this quick lookup chart to find standard wire gauge, circuit breaker ampacity, and disconnect box requirements for standard residential ductless mini-split systems under typical 50-foot runs.

BTU Capacity Voltage Typical MCA Typical MOP Required Wire Circuit Breaker Disconnect Box
9,000 BTU (115V) → 115V 12A 15A 14 AWG Copper 15A Single-Pole 30A Non-Fused
12,000 BTU (115V) → 115V 16A 20A 12 AWG Copper 20A Single-Pole 30A Non-Fused
12,000 BTU (208/230V) → 230V 9A 15A 14 AWG Copper 15A Double-Pole 30A Non-Fused
18,000 BTU (208/230V) → 230V 16A 20A 12 AWG Copper 20A Double-Pole 30A Non-Fused
24,000 BTU (208/230V) → 230V 21A 30A 10 AWG Copper 30A Double-Pole 30A Non-Fused
36,000 BTU (208/230V) → 230V 32A 45A 8 AWG Copper 45A Double-Pole 60A Non-Fused

*220V, 230V, and 240V Terminology: In residential electrical branch wiring, 220V, 230V, and 240V refer to the same nominal single-phase utility service. Sizing rules, conductor gauges, and breaker sizes apply identically to all equipment labeled 220V, 230V, or 240V.

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