Step-down transformers reduce voltage from a higher to lower level (e.g., 230V to 110V) and are commonly used on construction sites to provide safer reduced voltage. Isolation transformers maintain the same voltage but provide electrical separation between input and output circuits, eliminating common-mode noise and providing protection against electrical faults. Isolation transformers are ideal for sensitive equipment, medical applications, and environments where clean power is essential. Some transformers combine both functions, providing both voltage transformation and electrical isolation.

The choice between single-phase and three-phase transformers depends on your power supply and equipment requirements. Single-phase transformers are used with standard domestic power supplies (230V in the UK) and are suitable for most small to medium equipment. Three-phase transformers are needed when you have a three-phase power supply (typically 400V) and need to power three-phase equipment or distribute balanced loads across multiple circuits. Some specialized transformers can convert between single-phase and three-phase power, though with certain limitations. Check your equipment specifications to determine the phase requirements.

Important safety features to look for include thermal overload protection (automatically disconnects power if the transformer overheats), short-circuit protection, proper IP rating for the environment (higher ratings for outdoor or dusty conditions), RCD protection for construction site transformers, proper earthing arrangements, and clear input/output labeling. Medical-grade transformers should have low leakage current and comply with relevant medical safety standards. All our hire transformers include these essential safety features and are regularly tested to ensure they meet current regulations.