3UG4511-1BN20

The Siemens SIRIUS 3UG4511-1BN20 phase sequence monitoring relay monitors a voltage range of 160~260VAC, outputs two sets of CO contacts (250VAC/3A), and is mounted on a 22.5mm wide DIN rail. It can detect phase loss, phase sequence errors, and voltage abnormalities, protecting low-voltage three-phase equipment.

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Siemens SIRIUS 3UG4511-1BN20 Three-phase voltage phase sequence monitoring relay

Product Positioning

The 3UG4511-1BN20 is a Siemens SIRIUS series three-phase voltage monitoring relay, designed for low-voltage power supply ranges of 160~260VAC. It can detect phase sequence errors and phase loss in real time to ensure stable operation of motors and control systems.

Core Product Advantages and Features

Low voltage power supply monitoring range

It can monitor 160 to 260VAC three-phase power supplies and is suitable for small motors and low-voltage power distribution systems.

Dual-switching contact output

It has two sets of CO (switching type) contacts, which can synchronously drive alarms and interlocking circuits.

Compact DIN rail design

The 22.5mm standard width housing can be directly snapped onto a DIN rail, saving control box space.

Rapid abnormal response

Automatically detects phase sequence errors, phase loss, and voltage abnormalities, reducing the risk of motor reversal and burnout.

project	Specification
Product Type	Three-phase voltage/phase sequence monitoring relay
Rated monitoring voltage	3 x 160...260V AC
Output contact form	DPDT (2 sets of switching contacts)
Rated capacity of contacts	250V AC / 3A
Terminal block type	Screw terminals
Dimensions of the outer casing (width x height x depth)	22.5 x 110 x 91 mm
Protection level	IP20
Operating ambient temperature	-20...+65°C
Installation method	DIN rail (35mm)
Product Series	SIRIUS 3UG4

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3UG4511-1AP20

The Siemens SIRIUS 3UG4511-1AP20 phase sequence monitoring relay monitors a voltage range of 320~500VAC, outputs one set of CO contacts (250VAC/3A), has a response time of approximately 450ms, and can be mounted on a 22.5mm wide DIN rail. It is suitable for medium and high voltage motor circuit protection.

3UG4511-1AN20

The Siemens SIRIUS 3UG4511-1AN20 phase sequence monitoring relay monitors a voltage range of 160~260VAC, outputs one set of CO contacts (250VAC/3A), is DIN rail mounted on a 22.5mm wide rail, and is compact and suitable for protection of small three-phase motor circuits.