240Vonly

240Vonly is a label used for electrical equipment or installations that are designed to operate exclusively on a nominal 240‑volt single‑phase supply and do not support operation at lower voltages such as 120V. Devices described as 240Vonly typically expect a supply near 240V and may not function reliably on 120V or with universal 100–240V input.

Technical requirements include a dedicated circuit and appropriate overcurrent protection, with wiring and connectors rated for higher voltage. In the United States, 240V‑only appliances often use two hot legs from a split‑phase system and may have no neutral; in other regions with 230–240V systems, outlets and plugs differ and must match local standards.

Regional usage varies. In markets with widely available 120/240V service, many heavy appliances such as ovens or certain air‑conditioning units are sold as 240V‑only. In areas with 230V nominal supplies, some products labeled 240V‑only may operate on standard 230–240V, while others require transformers or voltage adapters to accommodate tolerance or frequency differences (50 Hz vs 60 Hz).

Safety and standards: Installations should comply with local electrical codes (for example, the NEC in the United States or IEC standards elsewhere). Misapplying 240Vonly equipment to incorrect voltages can cause damage or fire; proper voltage, grounding, and protection are essential. See also voltage, electrical safety, electrical code.