ERSA 50 S Standard Soldering Iron The tried and proven soldering iron the ERSA 50 S is designed for soldering operations with a greater heat requirement, as, for example, on copper conductors with a cross-section of 2.5 mmĀ² and soldering thin sheet metal. The device is supplied with an angled ERSADUR Long-life soldering tip (0052JD) and a holder (0A04).