3UG4621-1AW30

The Siemens SIRIUS 3UG4621-1AW30 microcurrent monitoring relay can monitor minute currents from AC 3 to 600mA or DC 0.003 to 0.6A, and is compatible with 24 to 240V AC/DC power supplies. Its maximum response time is only 450ms.

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Product Positioning

The 3UG4621-1AW30 is a monitoring relay in the Siemens SIRIUS series specifically designed for monitoring minute currents in the milliampere (mA) range. It is suitable for applications requiring precise detection of low-current anomalies.

Core Product Advantages and Features

mA-level microcurrent measurement

The measurement range is AC 3 to 600mA or DC 0.003 to 0.6A, and the action value can be precisely set from 0.003 to 0.5A.

Current window identification function

It supports current window identification mode, which can monitor the upper and lower limits simultaneously, making it suitable for precision applications that require bidirectional detection.

General-purpose control power supply

The control power supply voltage covers 24 to 240V AC/DC, 50/60Hz, and a single model is suitable for multiple power supply systems.

Fast Response Design

With a maximum response time of only 450ms and a power-on delay of about 1 second, it can quickly respond to abnormal current conditions.

project	Specification
Model (MLFB)	3UG4621-1AW30
Monitoring function	Single-phase micro-overcurrent/undercurrent monitoring, including current window identification
Current measurement range	AC 3~600mA / DC 0.003~0.6A (Actuation value adjustable from 0.003 to 0.5A)
Control power supply voltage	24~240V AC/DC, 50/60Hz
Output contacts	1 set of changeover contacts (CO)
Contact Rating	AC-15 3A/250V, 400V; DC-13 1A/24V
Delay time	Adjustable from 0.1 to 20 seconds
Maximum response time	Approximately 450ms
Power-on startup delay	Approximately 1 second
Installation width	22.5mm

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