Siemens 3UA4801-0EZ Overload Relay

Siemens 3UA4801-0EZ Overload Relay is a ULR device in the Siemens 3UA family that provides motor protection with a current monitoring range of 0.5 to 0.8 A and a voltage rating up to 600 VAC. This thermal overload relay is designed for use in motor control circuits, typically mounted with a compatible Siemens contactor to safeguard motors against overload conditions by interrupting the circuit when the protected current exceeds the set range. The 3UA4801-0EZ designation identifies a compact, purpose-built relay intended for smaller to mid-size AC motors, aligning with Siemens’ integrated protection approach. By operating within the 0.5–0.8 A window and the 600 VAC limit, it supports reliable protection across various industrial applications without incurring nuisance trips during normal startup transients. The 3UA series is known for its thermal protection methodology, offering straightforward setpoint behavior and robust performance in standard industrial environments. This overload relay is suitable for installation within standard control panels and motor starters that rely on Siemens’ ecosystem for coherent protection coordination and ease of maintenance.